Patent Publication Number: US-2023150025-A1

Title: Fabricated object, fabrication apparatus, and method for manufacturing fabricated object

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This patent application is based on and claims priority pursuant to 35 U.S.C. § 119(a) to Japanese Patent Application No. 2021-184521, filed on Nov. 12, 2021, in the Japan Patent Office, the entire disclosure of which is incorporated by reference herein. 
     BACKGROUND 
     Technical Field 
     The present disclosure relates to a fabricated object, a fabrication apparatus, and a method for manufacturing a fabricated object. 
     Related Art 
     In recent years, an apparatus for manufacturing a three-dimensional fabricated object has been widely used in a wide variety of fields. For example, there is proposed a fabrication apparatus, having a gap of 10 μm to 100 μm between a flattening roller and a cleaning blade to form a fabrication layer with little decrease in an amount of small-particle-diameter powder and little change in composition while reducing adhesion of the powder to the flattening roller. 
     SUMMARY 
     A fabricated object according to an embodiment of the present invention is manufactured from a powder contained in a container of a fabrication apparatus and satisfies the following relationship d&gt;d′, where d (μm) denotes a number average diameter of the powder contained in the container and d′ (μm) denotes a number average diameter of the powder included in the fabricated object. 
    
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS 
       A more complete appreciation of the disclosure and many of the attendant advantages and features thereof can be readily obtained and understood from the following detailed description with reference to the accompanying drawings, wherein: 
         FIG.  1    is a plan view of a fabrication apparatus according to an embodiment of the present invention; 
         FIG.  2    is a side view of the fabrication apparatus according to an embodiment of the present invention; 
         FIG.  3    is a side view of the fabrication apparatus according to an embodiment of the present invention in the vicinity of a powder chamber; 
         FIG.  4    is a general external view of the fabrication apparatus according to an embodiment of the present invention; 
         FIG.  5    is an external view of the fabrication apparatus according to an embodiment of the present invention in the vicinity of the powder chamber; 
         FIG.  6    is a block diagram of a control unit in the fabrication apparatus according to an embodiment of the present invention; 
         FIG.  7 A  is a schematic diagram illustrating a method for manufacturing a fabricated object according to an embodiment of the present invention; 
         FIG.  7 B  is a schematic diagram illustrating a method for manufacturing a fabricated object according to an embodiment of the present invention; 
         FIG.  7 C  is a schematic diagram illustrating a method for manufacturing a fabricated object according to an embodiment of the present invention; 
         FIG.  7 D  is a schematic diagram illustrating a method for manufacturing a fabricated object according to an embodiment of the present invention; 
         FIG.  7 E  is a schematic diagram illustrating a method for manufacturing a fabricated object according to an embodiment of the present invention; 
         FIG.  8    is a diagram illustrating a behavior of powder during recoating under a conventional condition; 
         FIG.  9    is a diagram illustrating a behavior of powder during recoating under a condition according to an embodiment of the present invention; 
         FIG.  10 A  is a graph indicating a relationship between a rotation speed of a flattening roller and a force in a horizontal direction; 
         FIG.  10 B  is a diagram illustrating a relationship between a rotation speed of the flattening roller and a force in a horizontal direction, during recoating; 
         FIG.  11    is a graph indicating a relationship between a peripheral speed of the flattening roller and a moving speed of the flattening roller, and a number average diameter; 
         FIG.  12    is a graph indicating a relationship between the peripheral speed of the flattening roller and the moving speed of the flattening roller, and a proportion of a small-particle-diameter powder; 
         FIG.  13    is a graph indicating a relationship between the peripheral speed of the flattening roller and the moving speed of the flattening roller, and a green body density; and 
         FIG.  14    is a graph indicating a relationship between the peripheral speed of the flattening roller and the moving speed of the flattening roller, and the number of contacts per particle. 
     
    
    
     The accompanying drawings are intended to depict embodiments of the present invention and should not be interpreted to limit the scope thereof. The accompanying drawings are not to be considered as drawn to scale unless explicitly noted. Also, identical or similar reference numerals designate identical or similar components throughout the several views. 
     DETAILED DESCRIPTION 
     In describing embodiments illustrated in the drawings, specific terminology is employed for the sake of clarity. However, the disclosure of this specification is not intended to be limited to the specific terminology so selected and it is to be understood that each specific element includes all technical equivalents that have a similar function, operate in a similar manner, and achieve a similar result. 
     Referring now to the drawings, embodiments of the present disclosure are described below. As used herein, the singular forms “a,” “an,” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. 
     According to embodiments of the present invention, a fabricated object having a high green body density and a large number of interparticle points is provided. 
     In the present disclosure, “powder” is sometimes referred to as “fine grain”, “fine particles” or “powder material”. “Fabrication liquid” is sometimes referred to as “curing liquid” or “reaction liquid”. “Solidified product” is sometimes referred to as a “cured product”. “Fabricated object” in which the “solidified products” are laminated is sometimes referred to as “green body”·“sintered body”, “molded body”, or a “three-dimensional fabricated object”. An object formed by heat-treating and degreasing “green body” is referred to sometimes as “degreased body”. The “green body” and the “degreased body” are sometimes collectively referred to as “sintered precursor”. “Fabrication apparatus” is sometimes referred to as “apparatus for manufacturing a three-dimensional fabricated object”, “manufacturing apparatus for a three-dimensional fabricated object”, or “powder fabrication device”. “Method for manufacturing a fabricated object” is sometimes referred to as “method of manufacturing a three-dimensional fabricated object” or “object fabrication method”. 
     (Fabricated Object) 
     A fabricated object according to an embodiment of the present invention is manufactured from a powder contained in a container of a fabrication apparatus, and satisfies the following relationship d&gt;d′, where d (μm) denotes a number average diameter of the powder contained in the container and d′ (μm) denotes a number average diameter of the powder included in the fabricated object. 
     Conventionally, a method of manufacturing a fabricated object includes thinly spreading powder while rotating a flattening roller serving as a flattener before discharging a curing liquid. 
     There is a problem that a number average diameter of the powder included in the fabricated object increases as a result of powder having a small particle diameter being scattered by the rotation of the flattening roller. If the number average diameter of the powder included in the fabricated object is large, a gap in the fabricated object increases, and thus, a green body density decreases, the number of interparticle points decreases, and the quality of a green body deteriorates. Therefore, to solve the conventional problem of the scattering of powder having a small particle diameter, a method using powder having a large proportion of powder having a small particle diameter may be considered. However, the powder having a large proportion of the small particle diameter generally deteriorates in fluidity, and thus, there is a problem that such powder is non-uniformly supplied into a fabrication chamber when the powder is flattened by the flattening roller. If the powder is supplied to the fabrication chamber in a hopper configuration, there is also a problem that the powder does not flow out smoothly and is supplied non-uniformly. As a result, there is a possibility that non-uniform quality occurs within the fabrication chamber. Therefore, it is desirable to solve the problem that the powder having a small particle diameter is reduced in amount by a method other than changing a particle size distribution of the powder. 
     The conventional technique described in Japanese Patent No. 6620505 proposes a technique of depositing, in a flattening region, powder adhering to a flattening roller, and powder having a small particle diameter scattered without adhering to the flattening roller is not supplied inside a fabricated object. The powder having a small particle diameter has a small weight and is wound up by the rotation of the flattening roller, and thus, it is considered that there is more powder scattered than the powder adhering to the flattening roller. Such a technique is to deposit the powder having a small particle diameter between layers, rather than to uniformly supply the powder having a small particle diameter, as a result, the fabrication quality is biased. Even when powder having a large proportion of powder having a small particle diameter is applied to the conventional technique, it is not possible to solve the problem of non-uniform quality of the fabricated object. Therefore, with the conventional technique, it is not possible to obtain an effect of solving the problem that as a result of the powder having a small particle diameter being scattered by the rotation of the flattening roller, the number average diameter of the powder included in the fabricated object increases than the powder used for the object fabrication. 
     Based on the above findings, as a result of diligent studies by the inventors of the present invention, the inventors of the present invention found that if a number average diameter of powder included in a fabricated object was focused, when a fabricated object was formed with powder having a smaller number average diameter than the powder used for the object fabrication, even when powder with a large number average diameter was used to stabilize quality and supply of the fabricated object, it was possible to obtain a fabricated object having an excellent quality of the green body including a high green body density and a large number of interparticle points, and reached the present invention. 
     Therefore, according to an embodiment of the present invention, the fabricated object is fabricated from a powder contained in a container of a fabrication apparatus, and satisfies the following relationship d&gt;d′, where d (μm) denotes a number average diameter of the powder contained in the container and d′ (μm) denotes a number average diameter of the powder included in the fabricated object. When the following relationship d&gt;d′ is satisfied, powder having a small particle diameter is prevented from reducing in amount during recoating and powder having a large particle diameter is effectively eliminated, and thus, a fabricated object having an excellent quality of the green body including a high green body density and a large number of interparticle points is obtained. 
     As long as the powder is contained in the container of the fabrication apparatus, there is no restriction, and the power may be appropriately selected according to a purpose. The powder contained in the container also includes powder before the object fabrication, in particular, before flattening processing by a flattener of the fabrication apparatus. The number average diameter d of the powder contained in the container is preferably 3 μm or more and 80 μm or less, more preferably 5 μm or more and 50 μm or less, and further preferably 15 μm or more and 40 μm or less. A proportion of small-particle-diameter powder having a number-based particle diameter of (0.6×number average diameter d) μm or less in the powder contained in the container is preferably 20% or more, more preferably 23% or more, further preferably 25% or more, particularly preferably 26% or more, and more particularly preferably 27% or more. It is noted that an upper limit of the proportion of the small-particle-diameter powder is preferably 40% or less, and more preferably 30% or less. 
     The powder included in the fabricated object means powder present in a fabricated object manufactured by using the powder contained in the container of the fabrication apparatus, which is powder in the fabricated object after being combined by the fabrication liquid. A number average diameter d′ of the powder included in the fabricated object is preferably 3 μm or more and 80 μm or less, more preferably 5 μm or more and 50 μm or less, and further preferably 15 μm or more and 40 μm or less. A proportion of small-particle-diameter powder having a number-based particle diameter of (0.6×number average diameter d) μm or less, relative to the powder included in the fabricated object is preferably 20% or more, more preferably 23% or more, further preferably 25% or more, particularly preferably 26% or more, and more particularly preferably 27% or more. It is noted that an upper limit of the proportion of the small-particle-diameter powder is preferably 40% or less, and more preferably 30% or less. 
     The number average diameter d (μm) of the powder contained in the container, the number average diameter d′ (μm) of the powder included in the fabricated object, and the proportion of the small-particle-diameter powder having a number particle diameter of (0.6×number average diameter d) μm or less can be measured as follows. To measure the number average diameter d (μm) of the powder contained in the container and the number average diameter d′ (μm) of the powder included in the fabricated object under the same measurement conditions, the number average diameter d (μm) of the powder contained in the container is measured from a beaker work body, as described below. 
     &lt;Preparation of Beaker Work Body&gt; 
     The beaker work body is a test sample simply prepared, without using a fabrication apparatus, by mixing powder used for object fabrication and a fabrication liquid in a beaker, placing the resulted mixture into a mold, and then curing the mixture. The beaker work body makes it possible to measure a particle size distribution of the powder (i.e., powder contained in the container) used for object fabrication under the same condition as that of the fabricated object. 
     The particle size distributions of the fabricated object and the beaker work body are measured as follows. 
     &lt;Measurement of Particle Size Distribution of Powder Included in Fabricated Object and Beaker Work Body&gt; 
     The manufactured fabricated object and the beaker work body are observed with an X-ray computed tomography (CT) device, and the particle size distribution is calculated from image analysis of the obtained three-dimensional CT image. Xradia 510 (manufactured by Carl Zeiss) is employed for the X-ray CT device. The imaging conditions are: an X-ray voltage of 80 kV, an X-ray power of 7 W, an exposure time of 3 seconds, a capturing angle of 360 degrees, and 2401 images to be captured. A visual field range is of cylindrical shape having diameter (φ) 1529.7×height (H) 1529.7 μm 3 , and a voxel size is 1.5057 μm. Three-dimensional (3D) image analysis software. Dragonfly (manufactured by Object Research System) is employed for the image analysis. The analysis is carried out as follows. Firstly, for the visual field range, image segmentation (identification) is performed using deep learning (algorithm: FC-DenseNet) to separate particles and voids. Subsequently, aggregated particles are separated one by one by a Python module called OpenPNM. Finally, an equivalent diameter is calculated for each particle, and the number-based particle size distribution (i.e., proportion of the small-particle-diameter powder having a number average diameter of (0.6×number average diameter) μm or less) for 10.000 particles is calculated. 
     The fabricated object is formed by applying a fabrication liquid to a powder layer including powder deposited in a fabrication chamber and laminating a fabrication layer obtained by solidifying the powder particles in the powder layer. 
     &lt;Powder&gt; 
     The powder includes (1) powder containing a base material, and (2) powder containing a base material and an organic material. (1) The powder containing a base material preferably comprises a base material. (2) The powder containing a base material and an organic material preferably has a configuration that a surface of the base material is covered with the organic material. It is noted that the powder used in the present disclosure is suitably used in various types of three-dimensional object fabrication methods including a selective laser sintering (SLS) method, a Si-Metal-Si (SMS) method, a high-speed sintering (HSS) method, and a binder jetting (BJ) method. 
     —Base Material— 
     The base material is not particularly limited as long as such a base material has a form of powder or particles, and can be appropriately selected depending on a purpose. Examples of the base material include, but are not limited to, metal, ceramics, carbon, polymer, wood, a biocompatible material, sand, and magnetic materials, and from a viewpoint of obtaining an extremely high-strength three-dimensional fabricated object, metal and ceramics that can be finally sintered (processed) are preferable. 
     The metal is not particularly limited, and examples thereof include, but are not limited to, magnesium (Mg), aluminum (Al), titanium (Ti), vanadium (V), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), copper (Cu), zinc (Zn), yttrium (Y), zirconium (Zr), niobium (Nb), molybdenum (Mo), lead (Pd), silver (Ag), indium (In), tin (Sn), tantalum (Ta), tungsten (W), neodymium (Nd), and alloys thereof. Each of these may be used alone or in combination with others. In particular, aluminum, zinc, magnesium, copper, stainless steel, titanium and alloys thereof are suitable. Examples of the aluminum alloy include, but are not limited to, AlSi 10 Mg, AlSi 12 , AlSi 7 Mg 0.6 , AlSi 3 Mg, AlSi 9 Cu 3 , Scalmalloy, and ADC 12 . 
     Examples of the ceramics include, but are not limited to, an oxide, a carbide, a nitride, and a hydroxide. Examples of the oxide include, but are not limited to, a metal oxide. Examples of the metal oxide include, but are not limited to, silica (SiO 2 ), alumina (Al 2 O 3 ), zirconia (ZrO 2 ), and titania (TiO 2 ). Each of these may be used alone or in combination with others. 
     A commercially available product may be used for the base material. Examples of the commercially available product include, but are not limited to, Pure Al (manufactured by Toyo Aluminum K.K., A 1070-30BB), Pure Ti (manufactured by OSAKA Titanium technologies Co., Ltd.), SUS316L (manufactured by Sanyo Special Steel Co., Ltd., product name: PSS316L); AlSI10Mg (manufactured by Toyo Aluminum K.K., Si10MgBB); SiO 2  (manufactured by Tokuyama Corporation, product name: EXCELICA SE-15K), A102 (manufactured by Taimei Chemicals Co., Ltd., product name: Taimicron TM-5D), and ZrO 2  (manufactured by Tosoh Corporation, product name: TZ-B53). The base material may be subjected to a known surface treatment (surface modification treatment) to improve adhesion to an organic material and to improve coating properties. 
     —Organic Material— 
     Any organic material may be used for the organic material in the case (1) above as long as the organic material has a reactive functional group, is soluble in the fabrication liquid, and is reactive with a cross-linker included in the fabrication liquid to form a cross-linked structure by covalent bond. 
     The reactive functional group is not particularly limited as long as such a reactive functional group is reactive with a cross-linker to form a covalent bond, and may be suitably selected according to a purpose. Examples thereof include, but are not limited to, a hydroxyl group, a carboxyl group, an amide group, a phosphate group, a thiol group, an acetoacetyl group, and an ether bond. Specifically, a resin having a hydroxyl group is preferred as the organic material for improving the adhesion to the base material and the reactivity with the cross-linker. 
     The organic material is preferably a resin having a hydroxyl group. Examples of the resin include, but are not limited to, polyvinyl acetal (glass transition temperature: 107° C.), polyvinyl butyral (glass transition temperature: 67° C.), polyacrylic polyol (glass transition temperature: 80° C.), polyester polyol (glass transition temperature: 133° C.), polybutadiene polyol (glass transition temperature: −17° C.), ethyl cellulose (glass transition temperature: 145° C.), and nitrocellulose (glass transition temperature: 50° C.). Examples of the resin further include, but are not limited to, a partially saponified product of vinyl acetate copolymer (vinyl chloride-vinyl acetate copolymer, ethylene-vinyl acetate copolymer, and the like), polyether polyol, and phenolic polyol. Each of these may be used alone or in combination with others. Among these resins, polyacrylic polyol is preferable. 
     &lt;Fabrication Liquid&gt; 
     The fabrication liquid used in the present disclosure is applied to the powder to solidify the particles of the powder. In a case (1) in which the powder contains the base material and the organic material, the fabrication liquid preferably contains a cross-linker and an organic solvent, and further contains another component as appropriate. In a case (2) in which the powder contains the base material, the fabrication liquid preferably contains an organic material, a cross-linker, and an organic solvent, and further contains another component as appropriate. 
     In the case (1) above, when the fabrication liquid is applied to the organic material included in the powder, the organic material is dissolved by the organic solvent included in the fabrication liquid and is crosslinked by an action of the cross-linker included in the fabrication liquid. In the case (2) above, when the fabrication liquid is applied to the powder, the organic material included in the fabrication liquid precipitates due to volatilization of the organic solvent to solidify the powder. 
     —Organic Material— 
     The organic material included in the fabrication liquid in the case of (2) above is preferably a resin having a hydroxyl group for the adhesion of the interface between the metal, as the base material, and the organic material. Examples of the resin having a hydroxyl group include, but are not limited to, polyvinyl acetal, polyvinyl butyral, polyacrylic polyol, polyester polyol, polybutadiene polyol, ethyl cellulose, nitrocellulose, polyvinylpyrrolidone, a partially saponified product of vinyl acetate copolymer (vinyl chloride-vinyl acetate, ethylene-vinyl acetate, and the like), polyether polyol, and phenolic polyol. Each of these may be used alone or in combination with others. A proportion of the organic material to a total amount of the fabrication liquid is preferably 1% by mass or more and 20% by mass or less, and more preferably 1% by mass or more and 10% by mass or less. 
     Examples of the organic solvent include, but are not limited to, an aliphatic hydrocarbon or an aromatic hydrocarbon including n-octane, m-xylene, and solventnaphtha; ketones including diisobutylketone, 3-heptanone, and 2-octanone; esters including butyl acetate, amyl acetate, n-hexyl acetate, n-octyl acetate, ethyl butyrate, ethyl valerate, ethyl caprylate, ethyl octylate, ethyl acetoacetate, ethyl 3-ethoxypropionate, diethyl oxalate, diethyl malonate, diethyl succinate, diethyl adipic acid, bis 2-ethylhexyl maleate, triacetin, tributyrin, and ethylene glycol monobutyl ether acetate; esters including dibutyl ether, 1,2-dimethoxybenzene, and 1,4-dimethoxybenzene; dimethyl sulfoxide, and dihydroterpinyl acetate. Each of these may be used alone or in combination with others. 
     A proportion of the organic solvent to a total amount of the fabrication liquid is preferably 30% by mass or more and 90% by mass or less, and more preferably 50% r by mass or more and 80% by mass or less. When the proportion of the organic solvent is 30% by mass or more and 90% by mass or less, solubility of the resin is increased and a strength of the three-dimensional fabricated object is increased. Also, a nozzle is prevented from drying when the apparatus is not operating (on standby), and nozzle clogging and printing failure caused thereby are prevented. 
     —Cross-Linkers— 
     In the case of (1) above, the cross-linker forms a covalent bond with a reactive functional group of the organic material (resin) of the powder to form a crosslinked structure, further increasing a strength of the obtained solidified product, and improving a solvent resistance. Further, in the case of (2) above, after the fabrication liquid adheres to the powder, the cross-linker cross-links by heat or ultraviolet rays, to further increase the strength of the obtained solidified product, and to improve a solvent resistance. It is noted that as used herein, the “cross-linker” is synonymous with the “curing agent”. 
     The cross-linker is not particularly limited, and may be appropriately employed from isocyanate, acid anhydride, epoxy, and phenol aldehyde. Preferably, the cross-linker has two or more of any of the above in a molecule or at an end of the molecule, and further preferably has three or more of the above. 
     —Other Components— 
     Other components are not particularly limited and appropriately selected according to a purpose, Examples thereof include, but are not limited to, a surfactant, an anti-drying agent, a viscosity regulator, a penetrant, a defoamer, a potential hydrogen (pH) regulator, a preservative, a fungicide, a colorant, a preservative, and a stabilizer. 
     In one embodiment of the present invention, it is preferable that the powder contains metal particle, and that the metal particle contains at least one selected from aluminum, zinc, magnesium, and alloys thereof. According to such an embodiment, a fabricated object having a high green body density and a large number of interparticle points is achieved. 
     In one embodiment of the present invention, it is preferable that a surface of the metal particles is not covered with the resin. According to such an embodiment, a fabricated object having a high green body density and a large number of interparticle points is achieved. 
     (Fabrication Apparatus and Method of Manufacturing Fabricated Object) 
     The fabrication apparatus according to an embodiment of the present invention is an apparatus for manufacturing the fabricated object according to an embodiment of the present invention. The fabrication apparatus includes a fabrication chamber in which a powder layer including powder is laminated, and a flattener that flattens the powder layer, and further includes, if necessary, other means. The flattener satisfies the following relationship V/v≥0.04, and preferably satisfies the following relationship V/v≥0.1. Here, v represents a peripheral speed (mm/s) of the flattener and V represents a moving speed (mm/s) of the flattener. 
     A method for manufacturing a fabricated object according to an embodiment of the present invention is a method of manufacturing the fabricated object according to an embodiment of the present invention. The method includes laminating a powder layer formed of powder, flattening the powder layer with a flattener, and further includes, if necessary, another step. The flattener satisfies the following relationship V/v≥0.04, and preferably satisfies the following relationship V/v≥0.1. Here, v represents a peripheral speed (mm/s) of the flattener and V represents a moving speed (mm/s) of the flattener. 
     Examples of the flattener include, but are not limited to, a flattening roller. 
     When an object is fabricated under the above flattening condition, the powder having a small particle diameter is prevented from reducing in amount during recoating and also the powder having a large particle diameter is effectively eliminated, and as a result, the following relationship d&gt;d′ is satisfied, where d (μm) denotes a number average diameter of the powder contained in the container of the fabrication apparatus and d′ (μm) denotes a number average diameter of the powder included in the fabricated object. 
     Here, an embodiment of the present invention will be described in detail with reference to the drawings. It is noted that in each drawing, the same reference numerals are used for the same components, and redundant description are omitted if appropriate. Further, the number, the position, the shape, and the like of the constituent members described below are not limited to those in the present embodiment, and can be suitably set to a preferable number, position, shape, and the like in implementing the present invention. 
       FIG.  1    is a plan view of a fabrication apparatus according to an embodiment of the present invention,  FIG.  2    is a side view of the fabrication apparatus according to an embodiment of the present invention.  FIG.  3    is a side view of the fabrication apparatus according to an embodiment of the present invention in the vicinity of a powder chamber,  FIG.  4    is a general external view of the fabrication apparatus according to an embodiment of the present invention.  FIG.  5    is an external view of the fabrication apparatus according to an embodiment of the present invention in the vicinity of the powder chamber, and  FIG.  6    is a block diagram of a control unit in the fabrication apparatus according to an embodiment of the present invention. 
     A fabrication apparatus illustrated in  FIG.  1    includes a fabrication unit  1  in which a fabrication layer  30 , which is a layered fabricated object formed by powder being combined, is formed, and a fabrication unit  5  that fabricates a three-dimensional fabricated object by discharging a fabrication liquid  10  onto a powder layer  31  spread in layers, of the fabrication unit  1 . 
     The fabrication unit  1  includes a powder chamber  11  and a flattening roller  12  as a rotator serving as a flattener (recoater). 
     The powder chamber  11  includes a supply chamber  21  that supplies powder  20  and a fabrication chamber  22  in which the fabrication layer  30  is laminated to manufacture a three-dimensional fabricated object. A bottom of the supply chamber  21  acts as a supply stage  23  and is freely elevated and lowered in a vertical direction (height direction). Similarly, a bottom of the fabrication chamber  22  acts as a fabrication stage  24  and is freely elevated and lowered in the vertical direction (height direction). A three-dimensional fabricated object in which the fabrication layer  30  is laminated is manufactured on the fabrication stage  24 . 
     The supply stage  23  is elevated and lowered in an arrow Z direction (height direction) by a motor  27 , as illustrated in  FIG.  4   , for example. Similarly, the fabrication stage  24  is elevated and lowered in the arrow Z direction by a motor  28 . 
     The powder chamber  11  includes a box-shaped chamber in which two top surfaces of the supply chamber  21  and the fabrication chamber  22  are opened. The supply stage  23  is arranged inside the supply chamber  21  and the fabrication stage  24  is arranged inside the fabrication chamber  22 , both of which are freely elevated and lowered. A side surface of the supply stage  23  is arranged to contact an inner side surface of the supply chamber  21 . A side surface of the fabrication stage  24  is arranged to contact an inner side surface of the fabrication chamber  22 . Top surfaces of the supply stage  23  and the fabrication stage  24  are kept horizontal. Next to the fabrication chamber  22  including an area surrounding the supply chamber  21  and the fabrication chamber  22 , a surplus powder receiving chamber  29  may be arranged ( FIG.  5   ). 
     If the surplus powder receiving chamber  29  is provided, the surplus powder  20 , out of the powder  20  transferred and supplied by the flattening roller  12 , falls when the powder layer  31  is formed. 
     The flattening roller  12  supplies the powder  20  supplied on the supply stage  23  of the supply chamber  21  to the fabrication chamber  22 , the supplied powder  20  is flattened by the flattening roller  12  being a flattening member to form the powder layer  31 . The flattening roller  12  is arranged to be reciprocally movable relative to a stage surface in an arrow Y direction along a stage surface (surface on which the powder  20  is laminated) of the fabrication stage  24 , and is moved by a reciprocating movement assembly  25 . The flattening roller  12  is rotationally driven by a motor  26 . 
     The flattening roller  12  transfers and supplies the powder  20  from the supply chamber  21  to the fabrication chamber  22  and smooths and flattens the surface of the powder  20  to form the powder layer  31  which is a layered powder having a predetermined thickness. The flattening roller  12  is a rod-shape member longer than an inside dimension of the fabrication chamber  22  and the supply chamber  21  (that is, a width of a portion supplied with or stored with the powder  20 ), and is reciprocally moved by the reciprocating movement assembly  25  in a Y direction (sub-scanning direction) along the stage surface. The flattening roller  12  horizontally moves to pass through an area above the supply chamber  21  and the fabrication chamber  22  from an outside of the supply chamber  21  while being rotated by the motor  26 . As a result, the powder  20  is transferred and supplied onto the fabrication chamber  22 , and the flattening roller  12  flattens the powder  20  while passing over the fabrication chamber  22 , thus forming the powder layer  31 . 
     As illustrated in  FIG.  2   , a powder removal plate  13 , which is a powder removal member for removing the powder  20  adhering to the flattening roller  12  by contacting a circumferential surface of the flattening roller  12 , is arranged. The powder removal plate  13  moves together with the flattening roller  12  while contacting the circumferential surface of the flattening roller  12 . The powder removal plate  13  is arranged to be in a counter direction when the flattening roller  12  rotates in a rotation direction when the flattening roller  12  flatten the powder. 
     In the present embodiment, a configuration is employed in which the powder chamber  11  of the fabrication unit  1  includes the two chambers, that is, the supply chamber  21  and the fabrication chamber  22 , but a configuration may be employed in which the fabrication chamber  22  is simply provided, the powder is supplied from the power supply device to the fabrication chamber  22  and the supplied powder is flattened by the flattening unit. 
     The fabrication unit  5  includes a liquid discharge unit  50  that discharges the fabrication liquid  10  to the powder layer  31  on the fabrication stage  24 . The fabrication unit  5  includes a slider unit  72  movably held by a guide member  71  arranged on a base member  7 , and allows for generally reciprocating movement in the Y direction (sub-scanning direction) orthogonal to an X direction. Such a fabrication unit  5  is generally reciprocated and moved in the Y direction by a Y-direction scanning assembly  552  described later. 
     The liquid discharge unit  50  includes a carriage  51 , and two liquid discharge heads (hereinafter simply referred to as “head”)  52   a  and  52   b  mounted on the carriage  51 . (The number of the liquid discharge heads may be one, or three or more.) The liquid discharge unit  50  is arranged, together with guide members  54  and  55 , to be elevated and lowered in the arrow Z direction, and elevated and lowered in a Z direction by a Z-direction elevating and lowering assembly  551  described later. 
     The carriage  51  is movably held by the guide members  54  and  55 . The guide members  54  and  55  are held by side plates  70  on both sides to be freely elevated and lowered. 
     Such a carriage  51  is reciprocated and moved by an X-direction scanning assembly  550  described later in an arrow X direction (hereafter simply referred to as “X direction”, and the same applies to other directions, that is, the arrow Y direction and the arrow Z direction) which is a main scanning direction via a main scanning movement mechanism configured by a motor, a pulley, and a belt. The carriage  51  integrally includes a post powder supply unit  80  which is a post power supply means that supplies the powder  20  to at least a portion to which the fabrication liquid  10  adheres when one fabrication layer  30  is formed in the fabrication chamber  22 . 
     The two heads  52   a  and  52   b  (hereinafter, collectively referred to as “head  52 ” unless otherwise particularly necessary) each includes two nozzle arrays in which a plurality of nozzles that discharges a liquid are arranged. Each nozzle array discharges the fabrication liquid. It is noted that the configuration of the head  52  and the liquid to be discharged are not limited to the above-described example. A plurality of tanks  60  containing each of the liquids are attached to a tank attachment unit  56 , and each liquid is supplied to the heads  52   a  and  52   b  via a supply tube or the like. 
     On one side in the X direction, a maintenance assembly  61  that maintains and recovers the head  52  of the liquid discharge unit  50  is arranged. The maintenance assembly  61  mainly includes a cap  62  and a wiper  63 . The cap  62  is brought into close contact with a nozzle surface (surface formed thereon with the nozzle) of the head  52  to suction the fabrication liquid  10  from the nozzle. This is to discharge the powder  20  blocking the nozzle and discharge the high-viscosity fabrication liquid  10 . Subsequently, the nozzle surface is wiped (cleaned) by the wiper  63  to form meniscus of the nozzle (the pressure is negative inside the nozzle). When the fabrication liquid  10  is not discharged, the maintenance assembly  61  covers the nozzle surface of the head  52  with the cap  62  to prevent the powder  20  from entering the nozzle and to prevent the fabrication liquid  10  from drying. 
     An outline of a control unit of the apparatus for manufacturing a three-dimensional fabricated object will be described with reference to  FIG.  6   .  FIG.  6    is a block diagram of the control unit of the apparatus for manufacturing a three-dimensional fabricated object. 
     The control unit  500  includes and a main control unit  500 A. The main control unit  500 A includes a central processing unit (CPU)  501  that generally controls the apparatus for manufacturing a three-dimensional fabricated object, a read only memory (ROM)  502  that stores a program including a program for causing the CPU  501  to execute control a three-dimensional fabrication operation including a control according to an embodiment of the present invention and stores other fixed data, and a random access memory (RAM)  503  that temporarily stores fabrication data and the like. 
     The control unit  500  includes a nonvolatile memory (NVRAM)  504  that retains data even while the apparatus is powered off. The control unit  500  further includes an application specific integrated circuit (ASIC)  505  to perform image processing in which various types of signals are processed on image data and processing of input and output signals for controlling the entire apparatus. 
     The control unit  500  includes an external interface (I/F)  506  to send and receive data and signals used when the controller  500  receives fabrication data from an external fabrication data creation apparatus  600 . The fabrication data creation apparatus  600  generates fabrication data in which a final-form fabricated object is sliced in each fabrication layer, and includes an information processor such as a personal computer. 
     The control unit  500  includes an input-output (I/O)  507  that receives detection signals of various types of sensors. 
     The control unit  500  includes a head drive control unit  508  that controls driving of the head  52  of the liquid discharge unit  50 . 
     The control unit  500  includes a motor drive unit  510  that drives a motor included in the X-direction scanning assembly  550  and a motor drive unit  512  that drives a motor included in the Y-direction scanning assembly  552 . The X-direction scanning assembly  550  moves the carriage  51  of the liquid discharge unit  50  in the X direction (main scanning direction). The Y-direction scanning assembly  552  moves the fabrication unit  5  in the Y direction (sub-scanning direction). 
     The control unit  500  includes a motor drive unit  511  that drives a motor included in the Z-direction elevating and lowering assembly  551 . The Z-direction elevating and lowering assembly  551  moves (elevates and lowers) the carriage  51  of the liquid discharge unit  50  in the Z direction. The Z direction elevating assembly  551  may move (elevates and lowers) the entire fabrication unit  5  in the arrow Z direction. 
     The control unit  500  further includes a motor drive unit  515  that drives a motor  553  of the reciprocating movement assembly  25  for moving the flattening roller  12  and a motor drive unit  516  that rotationally drives the motor  26  for rotating the flattening roller  12 . 
     The control unit  500  includes a post supply drive unit  519  configured so that the powder  20  is supplied from the post powder supply unit  80 . 
     The I/O  507  of the control unit  500  is input with a detection signal of a temperature and humidity sensor  560  that detects a temperature and a humidity as an environmental condition of the apparatus and detection signals of another sensors. 
     The control unit  500  is connected with an operation panel  522  used to input and display information necessary for the apparatus. 
     The fabrication data creation apparatus  600  and a three-dimensional fabrication apparatus (powder laminating fabrication apparatus)  601  form a fabrication system. 
     Next, a flow of fabrication will be described with reference to  FIGS.  7 A to  7 E .  FIGS.  7 A to  7 E  are schematic explanatory diagrams for explaining the flow of the fabrication. 
     Firstly, the fabrication layer  30  being a first layer is formed on the fabrication stage  24  of the fabrication chamber  22 . When the next fabrication layer  30  is formed on such a fabrication layer  30 , as illustrated in  FIG.  7 A , the supply stage  23  of the supply chamber  21  is elevated in a Z1 direction, and the fabrication stage  24  of the fabrication chamber  22  is lowered in a Z2 direction. 
     At this time, a lowering distance of the fabrication stage  24  is set so that a distance between a top surface of the fabrication chamber  22  (powder layer top surface) and a bottom of the flattening roller  12  (bottom tangential portion) is Δt1. The distance Δt1 corresponds to a thickness of the powder layer  31  to be subsequently formed. As an example, the distance Δt1 is preferably about several tens μm to about 100 μm. 
     Next, as illustrated in  FIG.  7 B , when the powder  20  located above a top surface level of the supply chamber  21  is moved in a Y2 direction (to a fabrication chamber  22  side) while the flattening roller  12  is rotated in a forward direction (arrow direction) to transfer and supply the powder  20  to the fabrication chamber  22  (supply powder). 
     Next, as illustrated in  FIG.  7 C , the flattening roller  12  is moved in parallel to a stage surface of the fabrication stage  24  of the fabrication chamber  22 , and as illustrated in  FIG.  7 D , the powder layer  31  having a predetermined thickness Δt1 is formed on the fabrication layer  30  of the fabrication stage  24  (flattening). After the powder layer  31  is formed, the flattening roller  12  moves in the Y1 direction and returns to an initial position as illustrated in  FIG.  7 D . Here, the flattening roller  12  is designed to allow for movement while maintaining a constant distance from the top surface level of the fabrication chamber  22  and the supply chamber  21 . When the flattening roller  12  moves with a constant distance, it is possible to form the powder layer  31  having a uniform thickness Δt1 on the fabrication chamber  22  or the already formed fabrication layer  30  while transporting the powder  20  onto the fabrication chamber  22  by the flattening roller  12 . 
     Next, as illustrated in  FIG.  7 E , a droplet of the fabrication liquid  10  is discharged from the head  52  of the liquid discharge unit  50  to laminate and form the fabrication layer  30  on the next powder layer  31  (fabrication). It is noted that when the fabrication liquid  10  discharged from the head  52  is mixed with the powder  20 , for example, adhesive included in the powder  20  is dissolved, and dissolved adhesive parts adhere one another to bond the powder  20  to form the fabrication layer  30 . 
     Next, the above-described forming the powder layer  31  by supplying and flattening the powder and the above-described discharging the fabrication liquid  10  with the head  52  are repeated to form the new fabrication layer  30 . At this time, the newly-formed fabrication layer  30  and the fabrication layer  30  therebeneath are united to form a part of a three-dimensional shaped fabricated object. Subsequently, the forming the powder layer  31  by supplying and flattening the powder and the discharging the fabrication liquid with the head  52  are repeated for the number of times to be employed to complete the three-dimensional shaped fabricated object (three-dimensional fabricated object). 
     Next, a behavior on the powder surface during recoating in the conventional technology will be described with reference to  FIG.  8   .  FIG.  8    is an enlarged schematic view of the flattening roller  12  and the fabrication chamber  31 . Powder transferred and supplied from the supply chamber to the fabrication chamber by the flattening roller is deposited in the fabrication chamber  31  at a density close to a bulk density, although the density depends on a material and a particle size distribution. 
     As illustrated in  FIG.  8   , the powder is spread over in the fabrication chamber  31  by the flattening roller  12 . At this time, the powder having a small particle diameter and a small mass is blown up by rotation of the flattening roller  12 , and thus, the powder supplied to the fabrication chamber has a smaller proportion of powder having a smaller particle diameter than the powder in the supply chamber. When the proportion of the powder having a small particle diameter is small, a small void is likely to be generated in the fabricated object, and a green body density decreases. In addition, there is also a problem that the number of contacts of the particles is reduced, and thus, sinterability is deteriorated. 
     To solve a problem that the proportion of the powder having a small particle diameter is small, a method of using powder having a large proportion of powder with a small particle diameter may be used. However, the powder having a large proportion of powder with a small particle diameter generally deteriorates in fluidity, and thus, there is a problem that such powder is non-uniformly supplied into a fabrication chamber when the powder is flattened by the flattening roller. On the other hand, if the powder is supplied to the fabrication chamber in a hopper configuration, there is a problem that the powder does not flow out smoothly and is supplied non-uniformly. These is a possibility that non-uniform quality occurs in the fabrication chamber. Therefore, it is desirable to solve the problem that the powder having a small particle diameter is reduced in amount by using a method other than changing a particle size distribution of the powder. 
     Next, as illustrated in  FIG.  11   , where d (μm) denotes a number average diameter of the powder contained in the container of the fabrication apparatus and d′ (μm) denotes a number average diameter of the powder included in the fabricated object, it is obvious that the following relationship d&gt;d′ is satisfied. It is considered that such a relationship results because the number average diameter of the powder supplied into the fabrication chamber decreases from the following two reasons, and as a result, the number average diameter of the fabricated object formed from the powder within the fabrication chamber also decreases. The first reason is that the rotation speed of the flattening roller is adjusted within a constant range to thereby prevent the powder having a small particle diameter from scattering. The second reason is that the rotation speed of the flattening roller is similarly adjusted within a constant range to thereby increase a force for conveying the powder in a horizontal direction, and as a result, to easily eliminate the powder having a large particle diameter that is susceptible to the horizontal force. 
     The first reason is based on a relationship between V/v and the proportion of the powder having a small particle diameter in the fabricated object (see  FIG.  12   ).  FIG.  12    is a graph indicating a relationship between a peripheral speed of the flattening roller and a moving speed of the flattening roller, and a proportion of powder with a small particle diameter. When a value of V/v is small, especially when the rotation speed of the roller is excessive, the proportion of the powder with a small particle diameter in the fabricated object is small. A reason for this is considered that the force for blowing up the powder is large to easily scatter the powder having a small particle diameter. In particular, the amount of scattering of powder having a number average diameter of 0.6d or less, which means 40% or more smaller than the number average diameter d of the powder used for the fabrication, is varied greatly depending on a flattening condition. 
     The second reason is based on a relationship between the rotation speed of the flattening roller  12  and the force in the horizontal direction (see  FIGS.  10 A and  10 B ).  FIG.  10 A  is a graph indicating the relationship between the rotation speed of the flattening roller  12  and the force in the horizontal direction.  FIG.  10 B  is a diagram illustrating a relationship between the rotation speed of the flattening roller  12  during recoating and the force in the horizontal direction. 
     As the peripheral speed v (mm/s) of the flattening roller  12  is smaller, the force applied in the horizontal direction is larger. Thus, the powder having a large particle diameter (i.e., powder having a larger number average diameter than the powder used for the fabrication) that easily flies off from the powder surface and is susceptible to the force of recoating receives the force in the horizontal direction and is easily discharged to the surplus powder receiver. As a result, the powder having a large particle diameter is not easily supplied to the powder surface. In particular, by setting the thickness of one layer to a range of 1 to 30 times the average particle diameter, more preferably 2 to 20 times the average particle diameter, the powder having a large particle diameter could be easily eliminated. 
     Here, if the moving speed V (mm/s) of the flattening roller  12  is increased, a force applied in the horizontal direction, out of the forces applied to the powder surface, is larger. It is obvious from the above results that such a fact prevents the scattering of the powder having a small particle diameter and increases an effect of eliminating the powder having a large particle diameter. Therefore, when a moving speed V of the flattening roller  12  is increased, as long as the following relationship V/v≥0.04 is satisfied, even if a value of a peripheral speed v of the flattening roller is increased to some extent, a fabricated object satisfying the following relationship d&gt;d′ can be obtained. 
     Next, a method of obtaining the fabricated object satisfying the following relationship d&gt;d′ will be described. When the moving speed V (mm/s) of the flattening roller, a rotation speed ω (min) −1 ) of the flattening roller, and a peripheral speed v (mm/s) of the flattening roller obtained from a diameter D mm of the flattening roller satisfy the following range, such a fabricated object can be obtained. 
     
       
         
           
             v 
             = 
             
               π 
               ⁢ 
               D 
               ⁢ 
               ω 
               / 
               60 
             
           
         
       
       
         
           
             
               V 
               v 
             
             ≧ 
             0.04 
           
         
       
     
     Here, to confirm the effect of the fabricated object satisfying the following relationship d&gt;d′, a green body density and the number of contacts, which were main characteristic values of the fabricated object, were measured. The results are presented in  FIGS.  13  and  14   . From the results of  FIG.  13   , the green body density is increased when the following relationship V/v≥0.04 is satisfied, as compared to when the following relationship V/v&lt;0.04 is satisfied. This is because, in the present disclosure, the proportion of the powder having a small particle diameter is increased, the small powder thereby enters the gap inside the fabricated object, and the density of the green body is increased.  FIG.  14    indicates a relationship between V/v and the number of contacts per particle. When the following relationship V/v≥0.04 is satisfied, as compared with when the following relationship V/v&lt;0.04 is satisfied, the number of particle contacts per particle increases. It is known that the number of particle contacts affects the sinterability, and it is expected that as there are more particle contacts, the sintering density is improved. 
     EXAMPLES 
     Examples of the present invention will be described below, but the present invention is in no way limited to such examples. 
     Comparative Example 1 
     According to a method of manufacturing a fabricated object illustrated in  FIGS.  7 A to  7 E , the fabricated object was manufactured under flattening conditions presented in Table 1. Sizes of the fabricated object were as follows: main scanning direction: 28 mm, sub-scanning direction: 10 mm, and laminating direction: 3 mm. 
     &lt;Powder&gt; 
     Al—Si based aluminum alloy powder (AlSi10Mg-30B, manufactured by Toyo Aluminum K.K.) was employed for the powder. A specific gravity of the powder was 2.7. 
     &lt;Fabrication Liquid&gt; 
     Three ingredients, JMR-10LL manufactured by JAPAN VAM &amp; POVAL CO., LTD., triglyme manufactured by SANKYO CHEMICAL Co., Ltd., and Surflon S-693 manufactured by AGC SEIMI CHEMICAL CO., LTD., were mixed to reach 13.35% by mass, 86.61% by mass, and 0.04% by mass, respectively, the resultant mixture was stirred with a magnetic stirrer for two hours while heating at 80° C., after the mixture was stirred for two hours, the mixture was continuously stirred until the room temperature was reached after stopping the heating to manufacture the fabrication liquid, and was discharged under discharge conditions presented in Table 1. 
     
       
         
           
               
               
             
               
                 TABLE 1 
               
               
                   
               
             
            
               
                 &lt;Flattening condition&gt; 
                   
               
               
                 Rotation speed of flattening roller [min −1 ] 
                 700 
               
               
                 Flattening roller diameter [mm] 
                 10 
               
               
                 Peripheral speed v of flattening roller [mm/s] 
                 366.5 
               
               
                 Moving speed V of flattening roller [mm/s] 
                 5 
               
               
                 V/v 
                 0.01 
               
               
                 &lt;Discharge condition&gt; 
                   
               
               
                 Discharge amount [pL/voxel] 
                 35 
               
               
                 Discharge speed [m/s] 
                 5 
               
               
                 Resolution 
                 300 × 300 
               
               
                 (Main scanning direction × sub-scanning direction) 
                   
               
               
                 [dpi 2 ] 
               
               
                   
               
            
           
         
       
     
     Example 1 
     When the object was fabricated similarly to the Comparative Example 1, except for lowering the rotation speed of the flattening roller and increasing the moving speed of the flattening roller under the flattening conditions as presented in Table 2 in Comparative Example 1, a fabricated object in which the following relationship d&gt;d′ was satisfied, was obtained. 
     
       
         
           
               
               
             
               
                 TABLE 2 
               
               
                   
               
             
            
               
                 &lt;Flattening condition&gt; 
                   
               
               
                 Rotation speed of flattening roller [min −1 ] 
                 300 
               
               
                 Flattening roller diameter [mm] 
                 50 
               
               
                 Peripheral speed v of flattening roller [mm/s] 
                 785.4 
               
               
                 Moving speed V of flattening roller [mm/s] 
                 30 
               
               
                 V/v 
                 0.04 
               
               
                 &lt;Discharge condition&gt; 
                   
               
               
                 Discharge amount [pL/voxel] 
                 35 
               
               
                 Discharge speed [m/s] 
                 5 
               
               
                 Resolution 
                 300 × 300 
               
               
                 (Main scanning direction × sub-scanning direction) 
                   
               
               
                 [dpi 2 ] 
               
               
                   
               
            
           
         
       
     
     Example 2 
     When the object was fabricated similarly to the Example 1, except for lowering the rotation speed of the flattening roller under the flattening conditions as presented in Table 3 in Example 1, a fabricated object in which the following relationship d&gt;d′ was satisfied, was obtained. 
     
       
         
           
               
               
             
               
                 TABLE 3 
               
               
                   
               
             
            
               
                 &lt;Flattening condition&gt; 
                   
               
               
                 Rotation speed of flattening roller [min −1 ] 
                 120 
               
               
                 Flattening roller diameter [mm] 
                 50 
               
               
                 Peripheral speed v of flattening roller [mm/s] 
                 314.2 
               
               
                 Moving speed V of flattening roller [mm/s] 
                 30 
               
               
                 V/v 
                 0.10 
               
               
                 &lt;Discharge condition&gt; 
                   
               
               
                 Discharge amount [pL/voxel] 
                 35 
               
               
                 Discharge speed [m/s] 
                 5 
               
               
                 Resolution 
                 300 × 300 
               
               
                 (Main scanning direction × sub-scanning direction) 
                   
               
               
                 [dpi 2 ] 
               
               
                   
               
            
           
         
       
     
     Example 3 
     When the object was fabricated similarly to the Example 2, except for lowering the rotation speed of the flattening roller under the flattening conditions as presented in Table 4 in Example 2, a fabricated object in which the following relationship d′&gt;d′ was satisfied, was obtained. 
     
       
         
           
               
               
             
               
                 TABLE 4 
               
               
                   
               
             
            
               
                 &lt;Flattening condition&gt; 
                   
               
               
                 Rotation speed of flattening roller [min −1 ] 
                 60 
               
               
                 Flattening roller diameter [mm] 
                 50 
               
               
                 Peripheral speed v of flattening roller [mm/s] 
                 157.1 
               
               
                 Moving speed V of flattening roller [mm/s] 
                 30 
               
               
                 V/v 
                 0.19 
               
               
                 &lt;Discharge condition&gt; 
                   
               
               
                 Discharge amount [pL/voxel] 
                 35 
               
               
                 Discharge speed [m/s] 
                 5 
               
               
                 Resolution 
                 300 × 300 
               
               
                 (Main scanning direction × sub-scanning direction) 
                   
               
               
                 [dpi 2 ] 
               
               
                   
               
            
           
         
       
     
     Example 4 
     When the object was fabricated similarly to the Example 1, except for changing the rotation speed of the flattening roller and increasing the moving speed of the flattening roller under the flattening conditions as presented in Table 5 in Example 1, a fabricated object in which the following relationship d&gt;d′ was satisfied, was obtained. 
     
       
         
           
               
               
             
               
                 TABLE 5 
               
               
                   
               
             
            
               
                 &lt;Flattening condition&gt; 
                   
               
               
                 Rotation speed of flattening roller [min −1 ] 
                 240 
               
               
                 Flattening roller diameter [mm] 
                 20 
               
               
                 Peripheral speed v of flattening roller [mm/s] 
                 251.3 
               
               
                 Moving speed V of flattening roller [mm/s] 
                 200 
               
               
                 V/v 
                 0.80 
               
               
                 &lt;Discharge condition&gt; 
                   
               
               
                 Discharge amount [pL/voxel] 
                 35 
               
               
                 Discharge speed [m/s] 
                 5 
               
               
                 Resolution 
                 300 × 300 
               
               
                 (Main scanning direction × sub-scanning direction) 
                   
               
               
                 [dpi 2 ] 
               
               
                   
               
            
           
         
       
     
     &lt;Production of Beaker Work Body&gt; 
     The powder and the fabrication liquid used for the fabrication of Examples 1 to 4 and the Comparative Example 1 were used to produce a beaker work body as follows. Here, the beaker work body is a test sample simply prepared without using a fabrication apparatus by placing a mixture in which the powder and the fabrication liquid are mixed into a mold and then curing the mixture. The beaker work body makes it possible to measure a particle size distribution of the powder (i.e., powder contained in the container) used for the object fabrication under the same condition as that of the fabricated object of the Examples 1 to 4 and the Comparative Example 1, under the same condition as that of the fabricated object. 
     Next, the obtained fabricated objects manufactured according to the Examples 1 to 4 and the Comparative Example 1 were evaluated for a particle size distribution, a green body density, and the number of particle contacts, as follows, and an effect determination 1 and an effect determination 2 were performed. The results are presented in Tables 7 and 8, and in  FIGS.  11  to  14   . The particle size distribution of the beaker work body is presented in Table 6. 
     &lt;Measurement of Particle Size Distribution of Powder Included in Fabricated Object and Beaker Work Body&gt; 
     The fabricated objects fabricated according to the Examples 1 to 4 and the Comparative Example 1 and the beaker work body were observed with an X-ray CT device to calculate the particle size distribution from image analysis of obtained three-dimensional CT images. Xradia 510 (manufactured by Carl Zeiss) was employed for the X-ray CT device. The imaging conditions were: an X-ray voltage of 80 kV, an X-ray power of 7 W, an exposure time of 3 seconds, a capturing angle of 360 degrees, and 2401 images to be captured. A visual field range was of cylindrical shape having diameter (φ) 1529.7×height (H) 1529.7 μm 3 , and a voxel size was 1.5057 μm. Three-dimensional (3D) image analysis software, Dragonfly (manufactured by Object Research System) was employed for the image analysis. The analysis was carried out as follows. Firstly, for the visual field range, image segmentation (identification) was performed using deep learning (algorithm: FC-DenseNet) to separate particles and voids. Subsequently, aggregated particles were separated one by one by a Python module called OpenPNM. Finally, an equivalent diameter was calculated for each particle, and the number-based particle size distribution (i.e., proportion of the small-particle-diameter powder having a number average diameter of (0.6×number average diameter) μm or less) for 10,000 particles was calculated. 
     &lt;Green Body Density&gt; 
     For a method for measuring the density of the fabricated object, a measuring method using Archimedes&#39; principle was employed. After measuring a weight A in the atmosphere, a weight B when the fabricated object is submerged into a liquid having a known density ρ 0  is measured. When ρ′ denotes the density specific to a material of the powder contained in the container, the density ρ (mass %) of the fabricated object (green body) was obtained as follows. 
       ρ=100ρ 0   A /ρ′( A−B )
 
     Pure water was used for a liquid used for the density measurement. To measure the green body having a gap therein, the weight A in the air was measured, and thereafter, a waterproof spray was applied to prevent the liquid from penetrating into the inside of the fabricated object. 
     &lt;Number of Particle Contacts per Particle&gt; 
     Observation with an X-ray CT device was performed, and the number of particle contacts was calculated from image analysis of the obtained three-dimensional CT image. Xradia 510 (manufactured by Carl Zeiss) was employed for the X-ray CT device. The imaging conditions were: an X-ray voltage of 80 kV, an X-ray power of 7 W, an exposure time of 3 seconds, a capturing angle of 360 degrees, and 2401 images to be captured. A visual field range was of cylindrical shape having diameter (q) 1529.7×height (H) 1529.7 μm 3 , and a voxel size was 1.5057 μm. Three-dimensional (3D) image analysis software, Dragonfly (manufactured by Object Research System) was employed for the image analysis. The analysis was carried out as follows. Firstly, for the visual field range, image segmentation (identification) was performed using deep learning (algorithm: FC-DenseNet) to separate particles and voids. Subsequently, aggregated particles were separated one by one by a Python module called OpenPNM, and a particle contact state was visualized. The total number of contacts and the total number of particles within a measurement range were measured, and the number of contacts per particle was calculated by the following formula. 
       Number of contacts per particle=(total number of contacts×2)/number of particles
 
     &lt;Effect Determination 1&gt; 
     An effect determination 1 was performed based on the following determination criteria. 
     [Determination Criteria] 
     Good: d′/d&lt;1.0 
     Poor: d′/d≥1.0 
     &lt;Effect Determination 2&gt; 
     An effect determination 2 was performed based on the following determination criteria. 
     [Determination Criteria] 
     Excellent: The proportion of the small particle diameter (0.6d or less) in the fabricated object is larger than the proportion of the small particle diameter (0.6d or less) of the powder contained in the container. 
     Good: The proportion of the small particle diameter (0.6d or less) in the fabricated object is smaller than the proportion of the small particle diameter (0.6d or less) of the powder contained in the container. 
     
       
         
           
               
             
               
                 TABLE 6 
               
             
            
               
                   
               
               
                 Particle size distribution of beaker work body 
               
            
           
           
               
               
               
            
               
                   
                 Number average diameter d of  
                 Proportion of small particle  
               
               
                   
                 powder used for fabrication [μm] 
                 diameter (0.6 d or less) [%] 
               
               
                   
                   
               
               
                   
                 28.41 
                 27.30 
               
               
                   
                   
               
            
           
         
       
     
     
       
         
           
               
               
               
               
               
               
               
               
               
             
               
                 TABLE 7 
               
               
                   
               
               
                   
                   
                   
                 Moving 
                   
                   
                   
                   
                   
               
               
                   
                   
                 Peripheral 
                 speed V 
                   
                   
                   
                   
                   
               
               
                   
                   
                 speed v of 
                 of 
                   
                   
                   
                   
                   
               
               
                   
                   
                 flattening 
                 flattening 
                   
                   
                   
                   
                   
               
               
                   
                 Powder 
                 roller 
                 roller 
                   
                   
                   
                   
                   
               
               
                   
                 material 
                 (mm/s) 
                 (mm/s) 
                 d (μm) 
                 d′(μm) 
                 d/d′ 
                 V/v 
                 d′/d 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 Ex. 1 
                 Aluminum 
                 785.4 
                 30 
                 28.41 
                 27.91 
                 1.01791 
                 0.04 
                 0.98 
               
               
                   
                 alloy 
                   
                   
                   
                   
                   
                   
                   
               
               
                 Ex. 2 
                 Aluminum 
                 314.2 
                 30 
                 28.41 
                 27.61 
                 1.02898 
                 0.1 
                 0.97 
               
               
                   
                 alloy 
                   
                   
                   
                   
                   
                   
                   
               
               
                 Ex. 3 
                 Aluminum 
                 157.1 
                 30 
                 28.41 
                 27.62 
                 1.0286 
                 0.19 
                 0.97 
               
               
                   
                 alloy 
                   
                   
                   
                   
                   
                   
                   
               
               
                 Ex. 4 
                 Aluminum 
                 251.3 
                 200 
                 28.41 
                 26.80 
                 1.06007 
                 0.8 
                 0.94 
               
               
                   
                 alloy 
                   
                   
                   
                   
                   
                   
                   
               
               
                 Com. 
                 Aluminum 
                 366.5 
                 5 
                 28.41 
                 31.25 
                 0.90912 
                 0.01 
                 1.10 
               
               
                 Ex. 1 
                 alloy 
               
               
                   
               
            
           
         
       
     
     
       
         
           
               
               
               
               
               
               
               
             
               
                 TABLE 8 
               
               
                   
               
               
                   
                   
                 Proportion 
                   
                   
                   
                   
               
               
                   
                   
                 of small 
                   
                   
                   
                   
               
               
                   
                   
                 particle 
                   
                   
                   
                   
               
               
                   
                 Proportion 
                 diameter 
                   
                   
                   
                   
               
               
                   
                 of small 
                 (0.6 d or 
                   
                   
                   
                   
               
               
                   
                 particle 
                 less) of 
                   
                   
                   
                   
               
               
                   
                 diameter 
                 powder 
                   
                 Number 
                   
                   
               
               
                   
                 (0.6 d or 
                 contained 
                   
                 of particle 
                 Effect 
                 Effect 
               
               
                   
                 less) in 
                 in 
                 Green 
                 contacts 
                 deter- 
                 deter- 
               
               
                   
                 fabricated 
                 container 
                 body 
                 per 
                 mination 
                 mination 
               
               
                   
                 object (%) 
                 (%) 
                 density 
                 particle 
                 1 
                 2 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
            
               
                 Ex. 1 
                 26.96 
                 27.3 
                 50.2 
                 5.6 
                 Good 
                 Good 
               
               
                 Ex. 2 
                 27.87 
                 27.3 
                 51.5 
                 7.7 
                 Good 
                 Excellent 
               
               
                 Ex. 3 
                 29.09 
                 27.3 
                 53.7 
                 9.0 
                 Good 
                 Excellent 
               
               
                 Ex. 4 
                 29.31 
                 27.3 
                 55.2 
                 8.4 
                 Good 
                 Excellent 
               
               
                 Com.  
                 26.04 
                 27.3 
                 47.5 
                 4.3 
                 Poor 
                 Good 
               
               
                 Ex. 1 
                   
                   
                   
                   
                   
                   
               
               
                   
               
            
           
         
       
     
     From the results of Tables 7 to 8 and  FIGS.  11  to  14   , in the Examples 1 to 4, it was found that when the following relationship V/v≥0.04 was satisfied, a fabricated object in which the relationship of d&gt;d′ was satisfied, was obtained, a green body density was large, and an excellent green body characteristic including a large number of interparticle points was provided. 
     Examples 5 to 25 and Comparative Examples 2 to 7 
     In Examples 1 to 4 and Comparative Example 1, fabricated objects of Examples 5 to 25 and Comparative Examples 2 to 7 were obtained similarly to the Examples 1 to 4 and Comparative Example 1 except for changing to the conditions presented in Tables 9 and 10. Each of the obtained fabricated objects was evaluated for a particle size distribution, a green body density, and the number of particle contacts, similarly to the Examples 1 to 4 and the Comparative Example 1, and the effect determination 1 and the effect determination 2 were performed. The results are presented in Tables 9 and 10. 
     
       
         
           
               
               
               
               
               
               
               
               
               
             
               
                 TABLE 9 
               
               
                   
               
               
                   
                   
                   
                 Moving 
                   
                   
                   
                   
                   
               
               
                   
                   
                 Peripheral 
                 speed V 
                   
                   
                   
                   
                   
               
               
                   
                   
                 speed v of 
                 of 
                   
                   
                   
                   
                   
               
               
                   
                   
                 flattening 
                 flattening 
                   
                   
                   
                   
                   
               
               
                   
                 Powder 
                 roller 
                 roller 
                   
                   
                   
                   
                   
               
               
                   
                 material 
                 (mm/s) 
                 (mm/s) 
                 d (μm) 
                 d′(μm) 
                 d/d′ 
                 V/v 
                 d′/d 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 Ex. 5 
                 Aluminum 
                 314.2 
                 30 
                 4.46 
                 4.38 
                 1.01826 
                 0.1 
                 0.98 
               
               
                   
                 alloy 
                   
                   
                   
                   
                   
                   
                   
               
               
                 Ex. 6 
                 Aluminum 
                 785.4 
                 30 
                 4.46 
                 4.41 
                 1.01134 
                 0.04 
                 0.99 
               
               
                   
                 alloy 
                   
                   
                   
                   
                   
                   
                   
               
               
                 Com. 
                 Aluminum 
                 366.5 
                 5 
                 4.46 
                 4.59 
                 0.97168 
                 0.01 
                 1.03 
               
               
                 Ex. 2 
                 alloy 
                   
                   
                   
                   
                   
                   
                   
               
               
                 Ex. 7 
                 Aluminum 
                 314.2 
                 30 
                 20.16 
                 19.97 
                 1.00951 
                 0.1 
                 0.99 
               
               
                   
                 alloy 
                   
                   
                   
                   
                   
                   
                   
               
               
                 Ex. 8 
                 Aluminum 
                 314.2 
                 30 
                 50.34 
                 48.78 
                 1.03198 
                 0.1 
                 0.97 
               
               
                   
                 alloy 
                   
                   
                   
                   
                   
                   
                   
               
               
                 Ex. 9 
                 Aluminum 
                 785.4 
                 30 
                 50.34 
                 49.48 
                 1.01738 
                 0.04 
                 0.98 
               
               
                   
                 alloy 
                   
                   
                   
                   
                   
                   
                   
               
               
                 Com. 
                 Aluminum 
                 366.5 
                 5 
                 50.34 
                 51.92 
                 0.96957 
                 0.01 
                 1.03 
               
               
                 Ex. 3 
                 alloy 
                   
                   
                   
                   
                   
                   
                   
               
               
                 Ex. 10 
                 Stainless 
                 314.2 
                 30 
                 2.99 
                 2.91 
                 1.02749 
                 0.1 
                 0.97 
               
               
                   
                 steel 
                   
                   
                   
                   
                   
                   
                   
               
               
                 Ex. 11 
                 Stainless 
                 314.2 
                 30 
                 25.62 
                 25.48 
                 1.00549 
                 0.1 
                 0.99 
               
               
                   
                 steel 
                   
                   
                   
                   
                   
                   
                   
               
               
                 Ex. 12 
                 Stainless 
                 314.2 
                 30 
                 50.13 
                 49.86 
                 1.00542 
                 0.1 
                 0.99 
               
               
                   
                 steel 
                   
                   
                   
                   
                   
                   
                   
               
               
                 Ex. 13 
                 Stainless 
                 785.4 
                 30 
                 25.62 
                 25.17 
                 1.01788 
                 0.04 
                 0.98 
               
               
                   
                 steel 
                   
                   
                   
                   
                   
                   
                   
               
               
                 Com. 
                 Stainless 
                 366.5 
                 5 
                 25.62 
                 27.11 
                 0.94504 
                 0.01 
                 1.06 
               
               
                 Ex. 4 
                 steel 
                   
                   
                   
                   
                   
                   
                   
               
               
                 Ex. 14 
                 Titanium 
                 314.2 
                 30 
                 9.75 
                 9.59 
                 1.01668 
                 0.1 
                 0.98 
               
               
                   
                 alloy 
                   
                   
                   
                   
                   
                   
                   
               
               
                 Ex. 15 
                 Titanium 
                 314.2 
                 30 
                 24.78 
                 24.53 
                 1.01019 
                 0.1 
                 0.99 
               
               
                   
                 alloy 
                   
                   
                   
                   
                   
                   
                   
               
               
                 Ex. 16 
                 Titanium 
                 314.2 
                 30 
                 80.5 
                 79.4 
                 1.01385 
                 0.1 
                 0.99 
               
               
                   
                 alloy 
                   
                   
                   
                   
                   
                   
                   
               
               
                 Ex. 17 
                 Titanium 
                 785.4 
                 30 
                 24.78 
                 24.61 
                 1.00691 
                 0.04 
                 0.99 
               
               
                   
                 alloy 
                   
                   
                   
                   
                   
                   
                   
               
               
                 Com. 
                 Titanium 
                 366.5 
                 5 
                 24.78 
                 25.03 
                 0.99001 
                 0.01 
                 1.01 
               
               
                 Ex. 5 
                 alloy 
                   
                   
                   
                   
                   
                   
                   
               
               
                 Ex. 18 
                 Pure 
                 314.2 
                 30 
                 2.86 
                 2.67 
                 1.07116 
                 0.1 
                 0.93 
               
               
                   
                 copper 
                   
                   
                   
                   
                   
                   
                   
               
               
                 Ex. 19 
                 Pure 
                 314.2 
                 30 
                 27.95 
                 27.41 
                 1.0197 
                 0.1 
                 0.98 
               
               
                   
                 copper 
                   
                   
                   
                   
                   
                   
                   
               
               
                 Ex. 20 
                 Pure 
                 314.2 
                 30 
                 81.29 
                 80.41 
                 1.01094 
                 0.1 
                 0.99 
               
               
                   
                 copper 
                   
                   
                   
                   
                   
                   
                   
               
               
                 Ex. 21 
                 Pure 
                 785.4 
                 30 
                 27.95 
                 27.58 
                 1.01342 
                 0.04 
                 0.99 
               
               
                   
                 copper 
                   
                   
                   
                   
                   
                   
                   
               
               
                 Com. 
                 Pure 
                 366.5 
                 5 
                 27.95 
                 28.13 
                 0.9936 
                 0.01 
                 1.01 
               
               
                 Ex. 6 
                 copper 
                   
                   
                   
                   
                   
                   
                   
               
               
                 Ex. 22 
                 Copper 
                 314.2 
                 30 
                 2.73 
                 2.59 
                 1.05405 
                 0.1 
                 0.95 
               
               
                   
                 alloy 
                   
                   
                   
                   
                   
                   
                   
               
               
                 Ex. 23 
                 Copper 
                 314.2 
                 30 
                 29.88 
                 27.8 
                 1.07482 
                 0.1 
                 0.93 
               
               
                   
                 alloy 
                   
                   
                   
                   
                   
                   
                   
               
               
                 Ex. 24 
                 Copper 
                 314.2 
                 30 
                 80.95 
                 79.18 
                 1.02235 
                 0.1 
                 0.98 
               
               
                   
                 alloy 
                   
                   
                   
                   
                   
                   
                   
               
               
                 Ex. 25 
                 Copper 
                 785.4 
                 30 
                 29.88 
                 28.45 
                 1.05026 
                 0.04 
                 0.95 
               
               
                   
                 alloy 
                   
                   
                   
                   
                   
                   
                   
               
               
                 Com. 
                 Copper 
                 366.5 
                 5 
                 29.88 
                 30.16 
                 0.99072 
                 0.01 
                 1.01 
               
               
                 Ex. 7 
                 alloy 
               
               
                   
               
            
           
         
       
     
     
       
         
           
               
               
               
               
               
               
               
             
               
                 TABLE 10 
               
               
                   
               
               
                   
                   
                 Proportion 
                   
                   
                   
                   
               
               
                   
                   
                 of small 
                   
                   
                   
                   
               
               
                   
                   
                 particle 
                   
                   
                   
                   
               
               
                   
                 Proportion 
                 diameter 
                   
                   
                   
                   
               
               
                   
                 of small 
                 (0.6 d or 
                   
                   
                   
                   
               
               
                   
                 particle 
                 less) of 
                   
                 Number 
                   
                   
               
               
                   
                 diameter 
                 powder 
                   
                 of 
                   
                   
               
               
                   
                 (0.6 d or 
                 contained 
                   
                 particle 
                 Effect 
                 Effect 
               
               
                   
                 less) in 
                 in 
                 Green 
                 contacts 
                 deter- 
                 deter- 
               
               
                   
                 fabricated 
                 container 
                 body 
                 per 
                 mination 
                 mination 
               
               
                   
                 object (%) 
                 (%) 
                 density 
                 particle 
                 1 
                 2 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
            
               
                 Ex. 5 
                 27.92 
                 27.4 
                 50.1 
                 6.8 
                 Good 
                 Excellent 
               
               
                 Ex. 6 
                 25.98 
                 27.4 
                 48.7 
                 4.7 
                 Good 
                 Good 
               
               
                 Com. 
                 25.75 
                 27.4 
                 48.7 
                 4.7 
                 Poor 
                 Good 
               
               
                 Ex. 2 
                   
                   
                   
                   
                   
                   
               
               
                 Ex. 7 
                 27.82 
                 27.6 
                 51.3 
                 7.5 
                 Good 
                 Excellent 
               
               
                 Ex. 8 
                 28.52 
                 26.9 
                 55.7 
                 7.1 
                 Good 
                 Excellent 
               
               
                 Ex. 9 
                 26.49 
                 26.9 
                 49.3 
                 4.9 
                 Good 
                 Good 
               
               
                 Com. 
                 24.70 
                 26.9 
                 49.2 
                 4.7 
                 Poor 
                 Good 
               
               
                 Ex. 3 
                   
                   
                   
                   
                   
                   
               
               
                 Ex. 
                 27.86 
                 27.3 
                 51.7 
                 6.1 
                 Good 
                 Excellent 
               
               
                 10 
                   
                   
                   
                   
                   
                   
               
               
                 Ex. 
                 2.7.93 
                 2.7.1 
                 53.7 
                 6.6 
                 Good 
                 Excellent 
               
               
                 11 
                   
                   
                   
                   
                   
                   
               
               
                 Ex. 
                 2.8.88 
                 28.5 
                 54.1 
                 6.9 
                 Good 
                 Excellent 
               
               
                 12 
                   
                   
                   
                   
                   
                   
               
               
                 Ex. 
                 26.38 
                 27.1 
                 51.9 
                 4.7 
                 Good 
                 Good 
               
               
                 13 
                   
                   
                   
                   
                   
                   
               
               
                 Com. 
                 25.91 
                 27.1 
                 50.2 
                 4.6 
                 Poor 
                 Good 
               
               
                 Ex. 4 
                   
                   
                   
                   
                   
                   
               
               
                 Ex. 
                 27.48 
                 26.6 
                 51.8 
                 5.9 
                 Good 
                 Excellent 
               
               
                 14 
                   
                   
                   
                   
                   
                   
               
               
                 Ex. 
                 27.52 
                 26.5 
                 52.5 
                 6.1 
                 Good 
                 Excellent 
               
               
                 15 
                   
                   
                   
                   
                   
                   
               
               
                 Ex. 
                 2.7.95 
                 27.2 
                 52.8 
                 6.5 
                 Good 
                 Excellent 
               
               
                 16 
                   
                   
                   
                   
                   
                   
               
               
                 Ex. 
                 25.83 
                 26.5 
                 51.3 
                 5.1 
                 Good 
                 Good 
               
               
                 17 
                   
                   
                   
                   
                   
                   
               
               
                 Com. 
                 25.10 
                 26.5 
                 50.6 
                 4.1 
                 Poor 
                 Good 
               
               
                 Ex. 5 
                   
                   
                   
                   
                   
                   
               
               
                 Ex. 
                 27.69 
                 27.4 
                 51.6 
                 5.6 
                 Good 
                 Excellent 
               
               
                 18 
                   
                   
                   
                   
                   
                   
               
               
                 Ex. 
                 27.97 
                 26.9 
                 52.7 
                 6.0 
                 Good 
                 Excellent 
               
               
                 19 
                   
                   
                   
                   
                   
                   
               
               
                 Ex. 
                 28.16 
                 27.8 
                 53.1 
                 6.5 
                 Good 
                 Excellent 
               
               
                 20 
                   
                   
                   
                   
                   
                   
               
               
                 Ex. 
                 26.57 
                 26.9 
                 49.7 
                 5.3 
                 Good 
                 Good 
               
               
                 21 
                   
                   
                   
                   
                   
                   
               
               
                 Com. 
                 25.35 
                 26.9 
                 49.4 
                 4.8 
                 Poor 
                 Good 
               
               
                 Ex. 6 
                   
                   
                   
                   
                   
                   
               
               
                 Ex. 
                 27.48 
                 26.7 
                 51.5 
                 5.7 
                 Good 
                 Excellent 
               
               
                 22 
                   
                   
                   
                   
                   
                   
               
               
                 Ex. 
                 27.54 
                 27 2 
                 52.9 
                 6.7 
                 Good 
                 Excellent 
               
               
                 23 
                   
                   
                   
                   
                   
                   
               
               
                 Ex. 
                 28.11 
                 27.0 
                 53.3 
                 6.8 
                 Good 
                 Excellent 
               
               
                 24 
                   
                   
                   
                   
                   
                   
               
               
                 Ex. 
                 25.82 
                 27.2 
                 50.0 
                 5.9 
                 Good 
                 Good 
               
               
                 25 
                   
                   
                   
                   
                   
                   
               
               
                 Com. 
                 25.43 
                 27.2 
                 49.8 
                 4.1 
                 Poor 
                 Good 
               
               
                 Ex. 7 
               
               
                   
               
            
           
         
       
     
     The details of the powder in Table 9 are as follows. The following powders were classified and used to obtain a target number average diameter d.
         Aluminum alloy: Al—Si based aluminum alloy (manufactured by Toyo Aluminum K.K., AlSi10Mg-30B, AlSi10Mg-50B)   Stainless steel: SUS316L (manufactured by Sanyo Special Steel Co., Ltd., product name: PSS316L)   Titanium alloy: Ti-6AL-4V (manufactured by TOHO TECHNICAL SERVICE, product name: ACA450, ACA150)   Pure copper: manufactured by Mitsui Mining &amp; Smelting Co., Ltd., product names: AS-C15, MA-CC-S, MA-CH-S   Copper alloy: manufactured by Mitsui Mining &amp; Smelting Co., Ltd., product name: MA-CCR25L       

     From the results in Tables 9 and 10, it was found that a similar effect to that of the aluminum alloy could be obtained even when stainless steel, titanium alloy, pure copper, and copper alloy were used as the powders having different types of material and particle diameters. From this, it was found that the effect of the present invention could be widely obtained as long as within the range of the types of materials and particle diameter of the metal powder generally used for three-dimensional fabrication. 
     Further, in the present disclosure, the supply chamber is used as the container that holds the powder to be supplied to the fabrication chamber of the fabrication apparatus, but the present disclosure can also be applied to a hopper configuration. Although the present disclosure employs the process of discharging the fabrication liquid by using an inkjet head as a curing means, another process in which a laser or an electron beam is used for the curing means may be applied. If any one of the following, that is, a surface roughness of the flattening roller is 0.5 μm or more, a ground resistance of the flattening roller is 1000 or more, and an absolute value of a surface potential of the powder is 0.5 kV or more, is satisfied, the powder adheres to the flattening roller, and a powder surface after flattening is uneven and the surface roughness deteriorates. Therefore, it is preferable that a surface roughness of the flattening roller of less than 0.5 μm, a ground resistance of the flattening roller of less than 1000, and an absolute value of a surface potential of the powder of less than 0.5 kV are satisfied. 
     For example, embodiments of the present invention include the following. 
     &lt;1&gt; A fabricated object manufactured from a powder included in a container of a fabrication apparatus, wherein the fabricated object satisfies the following relationship d&gt;d′, where d (μm) denotes a number average diameter of the powder contained in the container and d′ (μm) denotes a number average diameter of the powder included in the fabricated object. 
     &lt;2&gt; The fabricated object according to &lt;1&gt;, wherein a number average diameter d′ of the powder included in the fabricated object is 3 μm or more and 80 μm or less. 
     &lt;3&gt; The fabricated object according to &lt;1&gt; or &lt;2&gt;, wherein the number average diameter d of the powder contained in the container is 3 μm or more and 80 μm or less. 
     &lt;4&gt; The fabricated object according to any one of &lt;1&gt; to &lt;3&gt;, wherein a proportion of small-particle-diameter powder having a number particle diameter of (0.6×number average diameter d) μm or less in the powder contained in the container is 26% or more. 
     &lt;5&gt; The fabricated object according to any one of &lt;1&gt; to &lt;4&gt;, wherein the powder contains a metal particle, and the metal particle contains at least one selected from the group consisting of aluminum, zinc, magnesium, copper, stainless steel, titanium, and an alloy thereof. 
     &lt;6&gt; The fabricated object according to &lt;5&gt;, wherein a surface of the metal particle is free of resin coating. 
     &lt;7&gt; A fabrication apparatus comprising: a fabrication chamber in which a powder layer including powder is laminated; and 
     a flattener configured to flatten the powder layer, 
     wherein the flattener satisfies the following relationship V/v≥0.04, where v represents a peripheral speed (mm/s) of the flattener and V represents a moving speed (mm/s) of the flattener. 
     &lt;8&gt; The fabrication apparatus according to &lt;7&gt;, wherein the flattener satisfies the following relationship V/v≥0.1. 
     &lt;9&gt; A method for manufacturing a fabricated object, comprising: laminating a powder layer including powder; and 
     flattening the powder layer with a flattener, 
     wherein the flattener satisfies the following relationship V/v≥0.04, where v represents a peripheral speed (mm/s) of the flattener and V represents a moving speed (mm/s) of the flattener. 
     &lt;10&gt; The method for manufacturing a fabricated object according to &lt;9&gt;, wherein the flattener satisfies the following relationship V/v≥0.1. 
     According to the fabricated object according to any one of &lt;1&gt; to &lt;6&gt;, the fabrication apparatus according to any one of &lt;7&gt; and &lt;8&gt;, and the method for manufacturing a fabricated object according to any one of &lt;9&gt; and &lt;10&gt;, it is possible to solve various conventional problems and achieve the object of the present invention. 
     The above-described embodiments are illustrative and do not limit the present invention. Thus, numerous additional modifications and variations are possible in light of the above teachings. For example, elements and/or features of different illustrative embodiments may be combined with each other and/or substituted for each other within the scope of the present invention.