Patent Publication Number: US-2021170699-A1

Title: Composite material forming method and composite material

Description:
TECHNICAL FIELD 
     The present invention relates to a composite material forming method and a composite material. 
     BACKGROUND ART 
     As a material having lightness and high strength, a composite material including a reinforcing fiber and a resin is known. The composite material is used for an aircraft, an automobile, a ship, or the like. As a method of producing a composite material, a method is known, the method including: laminating a sheet of a composite material including a reinforcing fiber and a resin; applying a magnetic field for heating in a state where the laminated sheet is pressurized such that the resin reacts (refer to PTL 1). 
     CITATION LIST 
     Patent Literature 
     [PTL 1] Japanese Unexamined Patent Application 
     SUMMARY OF INVENTION 
     Technical Problem 
     After pressurizing and heating the laminated sheet of the composite material such that the resin reacts for forming, the composite material is used in a state where it is joined to another member in many cases. In this case, in order to join the composite material to the member, a part of another resin different from the resin to react for forming is caused to react. However, in the method described in PTL 1, a resin to react cannot be selected. Therefore, there is a problem in that it is difficult to use the composite material that is formed by causing the resin to react in a state where it is joined to another member. 
     The present invention has been made in consideration of the above-described circumstances, and an object thereof is to provide a composite material forming method capable of easily using a composite material that is formed by causing a resin to react in a state where it is joined to another member; and a composite material. 
     Solution to Problem 
     In order to solve the above-described problems and to achieve the object, there is provided a composite material forming method including: a first material preparation step of preparing a first material including a first reinforcing fiber and a first resin; a second material preparation step of preparing a second material including a second reinforcing fiber and a second resin; a material assembly step of assembling the first material and the second material to each other, and a first heating step of joining the first material and the second material to each other by heating the first material and the second material assembled in the material assembly step under a condition where the first resin reacts more predominantly than the second resin such that the first resin reacts more predominantly than the second resin. 
     With this configuration, by performing heating under a predetermined condition using the first material including the first resin that reacts under the predetermined condition and the second material including the second resin that is less likely to react under the predetermined condition, the first resin reacts more predominantly than the second resin, and the state where the second resin is less likely to react can be maintained. Therefore, the composite material that is formed by causing the first resin to react can be easily used in a state where it is joined to another member in the portion of the second material including the second resin. Further, only the heated portion has to be pressurized, and thus a mold relating to forming can be simplified. 
     In this configuration, it is preferable that the first material preparation step is a magnetic field circuit forming material preparation step of preparing a magnetic field circuit forming material in which a magnetic field circuit is formed as the first material, the second material preparation step is a magnetic field circuit non-forming material preparation step of preparing a magnetic field circuit non-forming material in which a magnetic field circuit is not formed as the second material, and the first heating step is a magnetic field heating step of applying a magnetic field for heating as the condition where the resin reacts more predominantly than the second resin. With this configuration, by applying a magnetic field for heating to the magnetic field circuit forming materials that is heated by the magnetic field and the magnetic field circuit non-forming material that is not heated by the magnetic field such that the first resin included in the magnetic field circuit forming materials reacts more predominantly than the second resin included in the magnetic field circuit non-forming material, a state where the second resin included in the magnetic field circuit non-forming material less likely to react can be favorably maintained. Therefore, the composite material that is formed by causing the first resin to react can be easily used in a state where it is joined to another member in the portion of the magnetic field circuit non-forming material including the second resin. Further, only the heated portion has to be pressurized, and thus a mold relating to forming can be simplified. 
     In addition, in the initially described configuration, it is preferable that the composite material forming method further includes: a second heating preparation step of disposing a heat generating material in the second material to heat the second material under a condition where the second resin reacts more predominantly than the first resin; and a second heating step of processing the second material along a member different from the first material and the second material to join the second material to the member by heating the second material in which the heat generating material is disposed in the second heating preparation step under a condition where the second resin reacts more predominantly than the first resin such that the second resin reacts more predominantly than the first resin. With this configuration, the heat generating material is disposed in the second material, and then heating is performed under a condition where the second resin reacts more predominantly than the first resin. As a result, by causing the second resin included in the second material to react more predominantly than the first resin included in the first material in a state where the first resin included in the first material is less likely to react, the second material can be joined to another member. Therefore, the composite material that is formed by causing the first resin to react can be more easily used in a state where it is joined to another member in the portion of the second material including the second resin. Further, only the heated portion has to be pressurized, and thus a mold relating to joining to another member can be simplified. 
     In the previously described configuration, it is preferable that the first material preparation step is a magnetic field circuit forming material preparation step of preparing a magnetic field circuit forming material in which a magnetic field circuit is formed as the first material, the second material preparation step is a magnetic field circuit non-forming material preparation step of preparing a magnetic field circuit non-forming material in which a magnetic field circuit is not formed as the second material, the first heating step is a magnetic field heating step of applying a magnetic field for heating as the condition where the first resin reacts more predominantly than the second resin, the second heating preparation step is an electric field heating preparation step of disposing an electromagnetic field heat generating body such as metal as the heat generating material to apply an electric field for heating as the condition where the second resin reacts more predominantly than the first resin, and the second heating step is an electric field heating step of applying an electric field for heating as the condition where the second resin reacts more predominantly than the first resin. With this configuration, the electromagnetic field heat generating body such as metal is disposed in the magnetic field circuit non-forming material, and an electric field is applied for heating. As a result, by causing the second resin included in the magnetic field circuit non-forming material to react more predominantly than the first resin included in the magnetic field circuit forming material in a state where the first resin included in the magnetic field circuit forming material is less likely to react, the magnetic field circuit non-forming material can be favorably joined to another member. Therefore, the composite material that is formed by causing the first resin to react can be more easily used in a state where it is joined to another member in the portion of the magnetic field circuit non-forming material including the second resin. Further, only the heated portion has to be pressurized, and thus a mold relating to joining to another member can be simplified. 
     In these configurations, it preferable that in the second material preparation step, the second material including the second resin having a higher reaction temperature than the first resin is prepared, and in the first heating step, the first material and the second material are heated at a temperature that is higher than or equal to the reaction temperature of the first resin and lower than the reaction temperature of the second resin. With this configuration, by applying a magnetic field for heating such that the first resin included in the magnetic field circuit forming material reacts more predominantly than the second resin included in the magnetic field circuit non-forming material, a state where the second resin included in the magnetic field circuit non-forming material less likely to react can be easily maintained. Therefore, the composite material that is formed by causing the first resin to react can be more easily used in a state where it is joined to another member in the portion of the magnetic field circuit non-forming material including the second resin. 
     In these configurations, it is preferable that, in the material assembly step, the first material and the second material are disposed along a longitudinal direction and assembled. With this configuration, regarding the composite material having a shape in which it is difficult to heat only the portion in which the first material including the first resin is disposed, the composite material that is formed by causing the first resin to react can be easily used in a state where it is joined to another member in the portion of the second material including the second resin, and a mold relating to forming can be simplified. 
     In order to solve the above-described problems and to achieve the object, there is provided a composite material including: a first material including a first reinforcing fiber and a first resin; a second material including a second reinforcing fiber and a second resin, in which a condition where the first resin reacts more predominantly than the second resin is satisfied, and the first material and the second material are joined along a longitudinal direction by being disposed along the longitudinal direction and assembled. 
     With this configuration, by causing the first resin included in the first material to react more predominantly than the second resin included in the second material, a state where the second resin included in the second material is less likely to react can be maintained. Therefore, the composite material that is formed by causing the first resin to react can be easily used in a state where it is joined to another member in the portion of the second material including the second resin, and a mold relating to joining to another member can be simplified. 
     In this configuration, it is preferable that the first material is a magnetic field circuit forming material in which a magnetic field circuit is formed, and the second material a magnetic field circuit non-forming material in which a magnetic field circuit is not formed. With this configuration, by causing the first resin included in the magnetic field circuit forming material to react more predominantly than the second resin included in the magnetic field circuit non-forming material, a state where the second resin included in the magnetic field circuit non-forming material less likely to react can be favorably maintained. Therefore, the composite material that is formed by causing the first resin to react can be easily used in a state where it is joined to another member in the portion of the magnetic field circuit non-forming material including the second resin, and a mold relating to joining to another member can be simplified. 
     In order to solve the above-described problems and to achieve the object, there is provided a composite material including: a first material including a first reinforcing fiber and a first resin; a second material including a second reinforcing fiber and a second resin; and a member different from the first material and the second material, in which a condition where the first resin reacts more predominantly than the second resin is satisfied, the first material and the second material are joined along a longitudinal direction by being disposed along the longitudinal direction and assembled, and the second material and the member are joined along the longitudinal direction. 
     With this configuration, by causing the second resin included is the second material to react more predominantly than the first resin included in the first material is a state where the first resin included in the first material is inhibited from reacting again more predominantly than the second resin included in the second material, the second material including the second resin can be joined to another member. Therefore, the composite material that is formed by causing the first resin to react can be easily used in a state where it is joined to another member in the portion of the second material including the second resin, and a mold relating to joining to another member can be simplified. 
     In this configuration, it is preferable that the first material is a magnetic field circuit forming material in which a magnetic field circuit is formed, and the second material a magnetic field circuit non-forming material in which a magnetic field circuit is not formed. With this configuration, by causing the second resin included in the magnetic field circuit non-forming material to react more predominantly than the first resin included in the magnetic field circuit forming material in a state where the first resin included in the magnetic field circuit forming material is inhibited from reacting again more predominantly than the second resin included in the magnetic field circuit non-forming material, the magnetic field circuit non-forming material including the second resin can be favorably joined to another member. Therefore, the composite material that is formed by causing the first resin to react can be easily used in a state where it is joined to another member in the portion of the magnetic field circuit non-forming material including the second resin, and a mold relating to joining to another member can be simplified. 
     Advantageous Effects of Invention 
     According to the present invention, it is possible to provide a composite material forming method capable of easily using a composite material that is formed by causing a resin to react in a state where it is joined to another member; and a composite material. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a flowchart illustrating a composite material forming method according to an embodiment of the present invention. 
         FIG. 2  is a diagram illustrating a magnetic field circuit forming material preparation step, a magnetic field circuit non-forming material preparation step, a material assembly step, and a magnetic field heating step of  FIG. 1 . 
         FIG. 3  is a schematic diagram illustrating an example of a composite material according to as embodiment of the present invention that is formed through the steps including up to the magnetic field heating step of  FIG. 1 . 
         FIG. 4  is a diagram illustrating an electric field heating preparation step and an electric field heating step. 
         FIG. 5  is a schematic diagram illustrating an example of the composite material according to the embodiment of the present invention that is formed through the steps including up to the electric field heating step of  FIG. 1 . 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Hereinafter, an embodiment of the present invention will be described is detail based on the drawings. The present invention is not limited to this embodiment. In addition, components in the embodiment include components that can be easily replaced and conceived by those skilled in the art or substantially the same components. Further, components described below can be appropriately combined with each other. 
     Embodiment 
       FIG. 1  is a flowchart illustrating a composite material forming method according to an embodiment of the present invention. As illustrated in  FIG. 1 , the composite material forming method according to the embodiment of the present invention includes a magnetic field circuit forming material preparation step S 11  as a first material preparation step, a magnetic field circuit non-forming material preparation step S 12  as a second material preparation step, a material assembly step S 13 , a magnetic field heating step S 14  as a first heating step, an electric field heating preparation step S 15  as a second heating preparation step, and an electric field heating preparation step S 16  as a second heating preparation step. 
       FIG. 2  is a diagram illustrating the magnetic field circuit forming material preparation step S 11 , the magnetic field circuit non-forming material preparation step S 12 , the material assembly step S 13 , and the magnetic field heating step S 14  of  FIG. 1 . In the first material preparation step, a first material as a composite material including a first reinforcing fiber and a first resin is prepared. In the magnetic field circuit forming material preparation step S 11 , magnetic field circuit forming materials  12 A and  12 B in which a magnetic field circuit is formed as a heat generating mechanism are prepared as the first material. 
     The first reinforcing fiber included in the magnetic field circuit forming materials  12 A and  12 B have electrical conductivity and form a circuit in the magnetic field circuit forming materials  12 A and  12 B. Therefore, when a magnetic field is applied to the first reinforcing fiber included in the magnetic field circuit forming materials  12 A and  12 B in the magnetic field heating step S 14  described below, an eddy current is induced in the first reinforcing fiber. As a result, heat is generated by electric resistance of the first reinforcing fiber. That is, in the magnetic field circuit forming materials  12 A and  12 B, the magnetic field circuit that can induce an eddy current is formed by the first reinforcing fiber, and heat is generated according to a magnetic field. Heat generated from the magnetic field circuit formed in the magnetic field circuit forming materials  12 A and  12 B is transferred to the first resin included in the magnetic field circuit forming materials  12 A and  12 B, which contributes to a reaction of the first resin. 
     The magnetic field circuit forming materials  12 A and  12 B have lightness and high strength. In the embodiment, the first reinforcing fiber included in the magnetic field circuit forming materials  12 A and  12 B is, for example, carbon fiber. However, the first reinforcing fiber is not limited to a carbon fiber and may be another metallic fiber. In addition, regarding a portion of the first reinforcing fiber not relating to the magnetic field circuit, a non-metallic fiber such as a glass fiber or a plastic fiber may also be used. 
     Examples of the first resin included in the magnetic field circuit forming materials  12 A and  12 B include a thermoplastic resin in which a thermofusion reaction occurs when heated and a thermosetting resin that enters a cured state from a softened state or a semi-cured state through a thermosetting reaction when heated. Hereinafter, regarding the first resin included in the magnetic field circuit forming materials  12 A and  12 B, when it is not necessary to distinguish between a thermoplastic resin and a thermosetting resin, the thermofusion reaction of the thermoplastic resin and the thermosetting reaction of the thermosetting resin will be simply referred to as “reaction”. 
     When the first resin included in the magnetic field circuit forming materials  12 A and  12 B is a thermoplastic resin in the embodiment, examples of the first resin include a polyamide resin, a polypropylene resin, an acrylonitrile butadiene styrene (ABS) resin, polyether ether ketone (PEEK), polyether ketone ketone (PEKK), and polyphenylene sulfide (PPS). 
     When the first resin included in the magnetic field circuit forming materials  12 A and  12 B is a thermosetting resin in the embodiment, examples of the first resin include a resin having an epoxy resin. When the resin included in the magnetic field circuit forming materials  12 A and  12 B has an epoxy resin, the resin is lighter and has higher strength, which is preferable. When the first resin included in the magnetic field circuit forming materials  12 A and  12 B is a thermosetting resin in the embodiment, other examples of the first resin include a polyester resin and a vinyl ester resin. However, the first resin included in the magnetic field circuit forming materials  12 A and  12 B is not limited to the examples and may be other resins. 
     Specific examples of the magnetic field circuit forming materials  12 A and  12 B include a preform material in which a preform obtained by three-dimensionally weaving a reinforcing fiber is impregnated with a thermoplastic resin, a commingled material in which a reinforcing fiber and a thermoplastic resin fiber are mixed and spun, a commingled knitted material in which a reinforcing fiber and a thermoplastic resin fiber are knitted and woven, a prepreg in which a reinforcing fiber is impregnated with a thermoplastic resin or a thermosetting resin, and a semi-cured or cured material in which a reinforcing fiber is impregnated with a thermosetting resin. In the magnetic field circuit forming materials  12 A and  12 B, the form of the magnetic field circuit can be adjusted depending on the arrangement state or weaving method of the reinforcing fiber. As a result, the amount of heat venerated according to a magnetic field can be adjusted. 
     In the second material preparation step, a second material as a composite material including a second reinforcing fiber and a second resin is prepared. In the magnetic field circuit non-forming material preparation step S 12 , a magnetic field circuit non-forming material  14  in which a magnetic field circuit is not formed is prepared as the second material. 
     The second reinforcing fiber included in the magnetic field circuit non-forming material  14  does not have electrical conductivity. Alternatively, the second reinforcing fiber has electrical conductivity, but a circuit is not formed in the magnetic field circuit non-forming material  14 . Therefore, even when a magnetic field is applied to the second reinforcing fiber included in the magnetic field circuit non-forming material  14  in the magnetic field heating step S 14  described below, an eddy current is less likely to be induced than in the first material. Therefore, even when heat is generated, the amount of heat generated is less than in the first material. That is, in the magnetic field circuit non-forming material  14 , the formation of a magnetic field circuit that can induce an eddy current is inhibited by the second reinforcing fiber, and the amount of heat generated according to a magnetic field is less than that in the first material. 
     The magnetic field circuit non-forming material  14  has lightness and higher strength. As the second reinforcing fiber included in the magnetic field circuit non-forming material  14 , the same fiber material as the first reinforcing fiber included in the magnetic field circuit forming materials  12 A and  12 B is favorably used, but the second reinforcing fiber is not limited thereto. For example, a fiber material not having electrical conductivity such as a glass fiber or a plastic fiber as a non-metallic fiber may also be used. 
     As the second resin included in the magnetic field circuit non-forming material  14 , the same resin as the first resin included in the magnetic field circuit forming materials  12 A and  12 B is favorably used. It is preferable that the second resin included in the magnetic field circuit non-forming material  14  has a higher reaction temperature than the first resin included in the magnetic field circuit forming materials  12 A and  12 B. In this case, when the first resin included in the magnetic field circuit forming materials  12 A and  12 B as the first material is caused to react, a state where the second resin included in the magnetic field circuit non-forming material  14  as the second material is less likely to react than the first resin included in the magnetic field circuit forming materials  12 A and  12 B as the first material can be more easily maintained. 
     Specific preferable examples of the magnetic field circuit non-forming material  14  include a resin-coated material in which a reinforcing fiber is coated with a resin and a resin-covered material in which a bundle of reinforcing fibers is covered with a resin. 
     As a result, a condition of applying a magnetic field for heating is satisfied between the magnetic field circuit forming materials  12 A and  12 B and the magnetic field circuit non-forming material  14  as the condition where the first resin included in the magnetic field circuit forming materials  12 A and  12 B reacts more predominantly than the second resin included in the magnetic field circuit non-forming material  14 . Here, the first resin reacting more predominantly represents that the reaction of the first resin is more likely to occur and the reaction of the second resin is less likely to occur. Specifically, the first resin accounts for at least 80% or higher, preferably 90% or higher, and more preferably 95% or higher with respect to the total mass of the resins that reacts. In addition, the magnetic field circuit forming materials  12 A and  12 B and the magnetic field circuit non-forming material  14  can be maintained in a state where the second resin included in the magnetic field circuit non-forming material  14  is less likely to react than the first resin included in the magnetic field circuit forming materials  12 A and  12 B. Here, the second resin being less likely to react than the first resin represents that the reaction of the first resin is more likely to occur and the reaction of the second resin is less likely to occur such that an unreacted portion of the second resin remains. Specifically, the unreacted portion accounts for at least 80% or higher, preferably 90% or higher, and more preferably 95% or higher with respect to the total mass of the second resin. 
     The first material and the second material may be in any form as long as they satisfies the condition where the first resin reacts more predominantly than the second resin included is the second material. The first material and the second material may be in a form in which the first material is the same as the material of the magnetic field circuit forming materials  12 A and  12 B, the amount of the same magnetic field circuit as that of the magnetic field circuit forming materials  12 A and  12 B in the second material is less than that of the first material, and the condition where the first resin reacts more predominantly than the second resin included is the second material is satisfied. 
     In addition, another preferable form of the first material and the second material may be a form in which the first material includes a heat generating body that is mixed in the first resin and generates heat under a predetermined condition instead of the magnetic field circuit and the second material does not include a heat generating body that generates heat under a predetermined condition in the second resin. In addition, the first material and the second material may be in a form in which the first material includes a first heat generating body that is mixed in the first resin and generates heat under a first condition instead of the magnetic field circuit, the second material includes a second heat generating body that is mixed in the second resin and generates heat under a first condition different from the first condition, and a condition where the first heat generating body reacts more predominantly than the second heat generating body is satisfied. Alternatively, In addition, the first material and the second material may be in a form in which the first material includes a heat generating body that is mixed in the first resin and generates heat under a predetermined condition instead of the magnetic field circuit, the second material includes a heat generating body that is mixed in the second resin and generates heat under a predetermined condition, and a condition where the amount of heat generated from the heat generating body mixed in the first resin is more than that of the heat generating body mixed in the second resin and the first resin reacts more predominantly than the second resin is satisfied. When the condition where the first resin reacts more predominantly than the second resin is satisfied due to the heat generating bodies, it is not necessary that the first reinforcing fiber form the magnetic field circuit. Therefore, a non-metallic fiber may be used as a whole. 
     Examples of the heat generating body included in the first material or the second material include an electromagnetic field heat generating body such as iron powder or metal that generates heat when a magnetic field is applied thereto. Here, when an electric field is applied to the electromagnetic field heat generating body such as metal in a predetermined direction, the molecular momentum increases such that heat generation is induced in the electromagnetic field heat generating body such as metal. In addition, when a magnetic field is applied to the electromagnetic field heat generating body such as metal in a direction perpendicular to the predetermined direction, a current generated in the electromagnetic field heat generating body such that heat is generated by electric resistance of the electromagnetic field heat generating body such as metal. Likewise, the electromagnetic field heat generating body such as metal absorbs an electromagnetic wave and generates heat. It is preferable that the electromagnetic field heat generating body such as metal is provided as a sheet of the electromagnetic field heat generating body such as metal that is applied by scattering the electromagnetic field heat generating body in a solution and blowing the solution. By locally or partially distributing the electromagnetic field heat generating body such as metal, local or partial heating can be accurately performed. 
     In addition, still another preferable form of the first material and the second material may be a form in which the first material and the second material do not include the magnetic field circuit and the heat generating body and the reaction temperature of the first resin included in the first material is lower than that of the second resin included in the second material. 
     Further, still another preferable form of the first material and the second material may be a form in which the respective conditions of the magnetic field circuit, the respective conditions of the heat generating body, and the respective conditions relating to the reaction temperatures of the first resin and the second resin are appropriately combined. 
     In the material assembly step S 13 , the first material and the second material are assembled. In the embodiment, specifically, the magnetic field circuit forming materials  12 A and  12 B and the magnetic field circuit non-forming material  14  are assembled. In the material assembly step S 13 , for example, as illustrated in  FIG. 2 , the magnetic field circuit forming materials  12 A and  12 B and the magnetic field circuit non-forming material  14  are disposed along a Z-axis direction as a longitudinal direction and assembled, the Z-axis direction being perpendicular to the plane in  FIG. 2 . 
     In this case, in the material assembly step S 13 , specifically, as illustrated in  FIG. 2 , the plate-shaped magnetic field circuit forming material  12 A is disposed along an in-plane direction perpendicular to a Y-axis direction as a vertical direction. In addition, in the material assembly step S 13 , the plate-shaped magnetic field circuit forming material  12 B is disposed along an in-plane direction perpendicular to an X direction as one horizontal direction, and one end surface of the plate-shaped magnetic field circuit forming material  12 B on a first side (upper side in  FIG. 2 ) in the Y-axis direction is brought into contact with the magnetic field circuit forming material  12 A to form a contact surface extending in the Z-axis direction. Further, in the material assembly step S 13 , the plate-shaped magnetic field circuit non-forming material  14  is disposed along an in-plane direction perpendicular to the Y-axis direction as the vertical direction and is brought into contact with an end surface of the plate-shaped magnetic field circuit forming material  12 B on a second side (lower side in  FIG. 2 ) in the Y-axis direction to form a contact surface extending in the Z-axis direction. That is, in the material assembly step S 13 , the magnetic field circuit forming materials  12 A and  12 B and the magnetic field circuit non-forming material  14  are assembled such that the end surfaces of the plate-shaped magnetic field circuit forming material  12 B on both sides in the Y-axis direction are interposed between the plate-shaped magnetic field circuit forming material  12 A and the plate-shaped magnetic field circuit non-forming material  14 . 
     The details of the material assembly step S 13  vary depending on the shapes of the pair of magnetic field circuit forming materials and the magnetic field circuit non-forming material. In the material assembly step S 13 , in addition to the above-described case, when cross-sections of the pair of magnetic field circuit forming materials perpendicular to the Z-axis direction have a C-shape and the magnetic field circuit non-forming material has a plate shape, portions of the pair of magnetic field circuit forming materials along the Y-axis direction are aligned and brought into contact with each other to be assembled, a filler is inserted into a gap between the pair of magnetic field circuit forming materials, and the surfaces of the pair of magnetic field circuit forming materials on the second side (lower side) in the Y-axis direction and the filler are brought into contact with each other to be assembled with the magnetic field circuit non-forming material as a cap such that a contact surface extending in the Z-axis direction is formed. In this state, the cross-sections perpendicular to the Z-axis direction have a I-shape as a whole. 
     In the first heating step, the first material and the second material are joined to each other by heating the first material and the second material assembled in the material assembly step S 13  under a condition where the first resin reacts more predominantly than the second resin such that the first resin reacts more predominantly than the second resin. In the embodiment, in the magnetic field heating step S 14  as the first heating step, the magnetic field circuit forming materials  12 A and  12 B and the magnetic field circuit non-forming material  14  are joined to each other by applying a magnetic field for heating to the magnetic field circuit forming materials  12 A and  12 B as the first material and the magnetic field circuit non-forming material  14  as the second material assembled in the material assembly step S 13  as the above-described condition such that the first resin included in the magnetic field circuit forming materials  12 A and  12 B reacts more predominantly than the second resin included in the magnetic field circuit non-forming material  14 . 
     In the magnetic field heating step S 14 , as illustrated in  FIG. 2 , pressure heating devices  22 ,  24 , and  26  that apply a magnetic field for heating while pressurizing the magnetic field circuit forming materials  12 A and  12 B are used. In the magnetic field heating step S 14 , specifically, as illustrated in  FIG. 2 , the pressure heating device  22  applies a magnetic field for heating while interposing the first side (in  FIG. 2 , the left side) of the magnetic field circuit forming material  12 A with respect to the magnetic field circuit forming material  12 B between the pressure heating device  22  and the pressure heating device  24  for pressurization. In addition, in the magnetic field heating step S 14 , the pressure heating device  22  applies a magnetic field for heating while interposing the second side (in  FIG. 2 , the right side) of the magnetic field circuit forming material  12 A with respect to the magnetic field circuit forming material  12 B between the pressure heating device  22  and the pressure heating device  26  for pressurization. Further, in the magnetic field heating step S 14 , a magnetic field is applied for heating between the pressure heating device  24  and the pressure heating device  26  while interposing the magnetic field circuit forming material  12 B between the pressure heating device  24  and the pressure heating device  26  for pressurization. 
     In the magnetic field heating step S 14 , by causing the first resin included in the magnetic field circuit forming materials  12 A and  12 B to react with each other, the magnetic field circuit forming material  12 A and the magnetic field circuit forming material  12 B are joined to each other on the end surface of the magnetic field circuit forming material  12 B on the first side in the Y-axis direction. In addition, in the magnetic field heating step S 14 , by causing the first resin included in the magnetic field circuit forming material  12 B to react with each other, the magnetic field circuit forming material  12 B and the magnetic field circuit non-forming material  14  are joined to each other on the end surface of the magnetic field circuit forming material  12 B on the second side in the Y-axis direction. 
     In the magnetic field heating step S 14 , when the reaction temperature of the second resin included in the magnetic field circuit non-forming material  14  is higher than that of the first resin included in the magnetic field circuit forming materials  12 A and  12 B, it is preferable that the pressure heating devices  22 ,  24 , and  26  perform heating at a temperature that is higher than or equal to the reaction temperature of the first resin included in the magnetic field circuit forming materials  12 A and  12 B and lower than the reaction temperature of the second resin included in the magnetic field circuit non-forming material  14 . In this case, by causing the first resin included in the magnetic field circuit forming materials  12 A and  12 B to react more predominantly than the second resin included in the magnetic field circuit non-forming material  14 , a state where the second resin included in the magnetic field circuit non-forming material  14  is less likely to react than the first resin included in the magnetic field circuit forming materials  12 A and  12 B can be more easily maintained. 
     The pressure heating devices  22 ,  24 , and  26  include a pressure cylinder (not illustrated) and alternating magnetic field application member (not illustrated) that are controlled by a control unit (not illustrated). The pressure heating devices  22 ,  24 , and  26  pressurize the magnetic field circuit forming materials  12 A and  12 B and the magnetic field circuit non-forming material  14  using the pressure cylinder (not illustrated) preferably at 50 kPa to 10 MPa and more preferably at 50 kPa to 3000 kPa. It is preferable that the pressure heating devices  22 ,  24 , and  26  applies a high-frequency magnetic field of 900 kHz or higher to the alternating magnetic field application member (not illustrated) to heat the magnetic field circuit forming materials  12 A and  12 B. It is preferable that the pressure heating devices  22 ,  24 , and  26  exhibit sufficient pressure resistance and heat resistance for the pressurization and heating in the magnetic field heating step S 14  and the pressure heating devices  22 ,  24 , and  26  are protected with a material that is transparent to the generated magnetic field, for example, a material such as a PEEK resin or a ceramic. 
     In the magnetic field heating step S 14 , by causing the first resin included in the magnetic field circuit forming materials  12 A and  12 B to react more predominantly than the second resin included in the magnetic field circuit non-forming material  14 , a state where the second resin included in the magnetic field circuit non-forming material  14  is less likely to react than the first resin included in the magnetic field circuit forming materials  12 A and  12 B can be maintained. Further, in the magnetic field heating step S 14 , only the heated portion has to be pressurized. For example, as in the rectangular shape of the pressure heating devices  22 ,  24 , and  26 , a mold relating to forming can be simplified. 
     The details of the first heating step vary depending on the form of the first material and the second material. For example, in the first heating step, in the form where the first material and the second material satisfy the condition where the first resin reacts more predominantly than the second resin included in the second material due to the heat generating body, the first material and the second material are joined to each other by causing the heat generating body to generate heat under the above-descried predetermined condition such that the first resin reacts more predominantly than the second resin. Here, the predetermined condition determines depending on the heat generating body, for example, application of a predetermined magnetic field, application of a predetermined electric field, or irradiation of a predetermined electromagnetic wave. In these cases, in the first heating step, as a heating device, a magnetic field application device that applies a magnetic field, an electric field application device that applies an electric field, or an electromagnetic wave irradiation device that irradiates an electromagnetic wave can be appropriately used depending on the respective heating forms. 
     In addition, in the first heating step, in the form where the first material and the second material satisfy the condition where the first resin reacts more predominantly than the second resin included in the second material due to the reaction temperatures of the first resin and the second resin, the first material and the second material are joined to each other by heating the first resin at a temperature at which the first resin reacts more predominantly than the second resin such that the first resin reacts more predominantly than the second resin. In this case, as the heating device, for example, a warm air heating device or an infrared heating device can be appropriately used. 
       FIG. 3  is a schematic diagram illustrating a composite material precursor  30  an example of a composite material according to an embodiment of the present invention that is formed through the steps including up to the magnetic field heating step S 14  of  FIG. 1 . As illustrated in  FIG. 3 , the composite material precursor  30  includes magnetic field circuit forming materials  32 A and  32 B as the first material and a magnetic field circuit non-forming material  34  as the second material. The magnetic field circuit forming materials  32 A and  32 B and the magnetic field circuit non-forming material  34  are joined along the Z-axis direction as a longitudinal direction by being disposed along the longitudinal direction and assembled. The composite material precursor  30  has a shape in which the magnetic field circuit forming materials  32 A and  32 B and the magnetic field circuit non-forming material  34  are joined along the longitudinal direction. Therefore, only the portion where the magnetic field circuit forming materials  32 A and  32 B are disposed has a shape where it is not likely to be heated even when a magnetic field, an electric field, an electromagnetic wave, or the like is applied thereto. 
     The magnetic field circuit forming material  32 A is formed by allowing the magnetic field circuit forming material  12 A to pass through the magnetic field heating step S 14  such that the first resin included in the magnetic field circuit forming material  12 A reacts. The magnetic field circuit forming material  32 B is formed by allowing the magnetic field circuit forming material  12 B to pass through the magnetic field heating step S 14  such that the first resin included in the magnetic field circuit forming material  12 B reacts. The magnetic field circuit non-forming material  34  is formed when the magnetic field circuit non-forming material  14  is joined to the end surface of the magnetic field circuit forming material  12 B on the second side through the magnetic field heating step S 14  while the second resin included in the magnetic field circuit non-forming material  14  is less likely to react than the first resin included in the magnetic field circuit forming materials  12 A and  12 B. 
     Although the composite material precursor  30  has the above-described shape, this way, the first resin included in the magnetic field circuit forming materials  32 A and  32 B reacts predominantly once, and the second resin included in the magnetic field circuit non-forming material  34  is less likely to react. Therefore, the composite material precursor  30  can be easily used in a state where the magnetic field circuit forming materials  32 A and  32 B and the magnetic field circuit non-forming material  34  are joined to another member  36  (refer to  FIG. 4 ) in the portion of the magnetic field circuit non-forming material  34  where the second resin is less likely to react than the first resin included in the magnetic field circuit forming materials  32 A and  32 B. When the composite material is used for an aircraft, the composite material precursor  30  is a stringer, a frame, or a shear tie, the member  36  (refer to  FIG. 4 ) different from the magnetic field circuit forming materials  32 A and  32 B and the magnetic field circuit non-forming material  34  is a fuselage skin of an aircraft body. 
       FIG. 4  is a diagram illustrating the electric field heating preparation step S 15  and an electric field heating step S 16 . In the second heating preparation step, the heat generating material is disposed in the second material to heat the second material under a condition where the second resin reacts more predominantly than the first resin. In the electric field heating preparation step S 15  as the second heating preparation step, as shown in  FIG. 4 , electromagnetic field heat generating bodies  47  and  48  such as metal as the heat generating material are disposed in the magnetic field circuit non-forming material  34  as the second material to apply an electric field to the magnetic field circuit non-forming material  34  for heating. As a result, the second resin included in the magnetic field circuit non-forming material  34  reacts more predominantly than the first resin included in the magnetic field circuit forming materials  32 A and  32 B. Here, the electromagnet field heat generating bodies  47  and  48  such as metal are the same as the electromagnetic field heat generating body such as metal described as an example of the heat generating body, and thus the detailed description will not be made. 
     In the electric field heating preparation step S 15 , specifically, as illustrated in  FIG. 4 , the electromagnetic field heat generating body  48  such as metal is disposed in a region between the magnetic field circuit non-forming material  34  and the member  36  different from the magnetic field circuit forming materials  32 A and  32 B and the magnetic field circuit non-forming material  34 . As a result, when the electromagnetic field heat generating body  48  such as metal applies an electric field to a surface of the magnetic field circuit non-forming material  34  facing the member  36  in the electric field heating step S 16  described below, heat can be generated. 
     In addition, in the electric field heating preparation step S 15 , it is preferable that the electromagnetic field heat generating body  47  such as metal is disposed in a region around an end surface of the magnetic field circuit forming material  32 B on the second side in the Y-axis direction that is joined to the magnetic field circuit non-forming material  34 . As a result, when the electromagnetic field heat generating body  47  such as metal applies an electric field to the region around the end surface of the magnetic field circuit forming material  32 B on the second side in the Y-axis direction that is joined to the magnetic field circuit non-forming material  34  in the electric field heating step S 16  described below, heat can be generated. 
     The details of the second heating preparation step vary depending on the heating form of the second heating step that is subsequently performed. For example, when the heating form of the second heating step is heating by a magnetic field, a heat generating material that generates heat when a magnetic field is applied thereto is disposed in the second heating preparation step. In addition, when the heating form of the second heating step is heating by an electromagnetic wave, a heat generating material that generates heat when irradiated with an electromagnetic wave is disposed in the second heating preparation step. 
     In addition, when the respective heating forms of the first heating step and the second heating step described below are different from each other, in the first material preparation step and the second material preparation step, the first resin can be caused to react more predominantly than the second resin in the heating form relating to the first heating step, and the second resin can be caused to react more predominantly than the first resin in the heating form relating to the second heating step. In this case, the second heating preparation step may be included in the first material preparation step and the second material preparation step. In this form, for example, when the heating form of the first heating step is heating by application of a magnetic field, application of an electric field, or irradiation of an electromagnetic wave and when the heating form of the second heating step is heating by a difference in reaction temperature between the first resin and the second resin, the first material and the second material are prepared such that a heat generating mechanism or a heat generating body that generates heat by a magnetic field, an electric field, or an electromagnetic wave is provided in the first material in advance, a heat generating mechanism or a heat generating body that generates heat by a magnetic field, an electric field, or an electromagnetic wave is not provided in the second material, and the reaction temperature of the second resin is lower than the reaction temperature of the first resin. In addition, when the heating form of the first heating step is heating by any one of application of a magnetic field, application of an electric field, and irradiation of an electromagnetic wave and when the heating form of the second heating step is heating by any one of application of a magnetic field, application of an electric field, and irradiation of an electromagnetic wave and is different from the heating form of the first heating step, the first material and the second material are prepared such that a heat generating mechanism or a heat generating body that generates heat by the heating form of the first heating step is provided in the first material is advance and a heat generating mechanism or a heat generating body that generates heat by the heating form of second heating step is provided in the second material in advance. 
     In the second heating step, the second material is processed along a member different from the first material and the second material to join the second material to the member by heating the second material in which the heat generating material is disposed in the second heating preparation step under a condition where the second resin reacts more predominantly than the first resin such that the second resin reacts more predominantly than the first resin. In the electric field heating step S 16  as the second heating step, the magnetic field circuit non-forming material  34  is processed along the member  36  different from the magnetic field circuit forming materials  32 A and  32 B and the magnetic field circuit non-forming material  34  to join the magnetic field circuit non-forming material  34  to the member  36  by applying an electric field for heating to the magnetic field circuit non-forming material  34  as the second material in which the electromagnetic field heat generating bodies  47  and  48  such as metal as the heat generating material are disposed in the electric field heating preparation step S 15  as the second heating preparation step as the above-described condition such that the second resin included in the magnetic field circuit non-forming material  34  reacts more predominantly than the first resin included in the magnetic field circuit forming materials  32 A and  32 B as the first material. 
     In the electric field heating step S 16 , as illustrated in  FIG. 4 , pressure heating devices  42 ,  44 , and  46  that apply an electric field for heating while pressurizing the magnetic field circuit non-forming material  34  are used. In the electric field heating step S 16 , specifically, as illustrated in  FIG. 4 , the pressure heating device  42  applies an electric field for heating while interposing the first side (in  FIG. 4 , the left side) of the magnetic field circuit non-forming material with respect to the magnetic field circuit forming material  32 B between the pressure heating device  42  and the pressure heating device  46  for pressurization. In addition, in the electric field heating step S 16 , the pressure heating device  44  applies an electric field for heating while interposing the second side (in  FIG. 4 , the right side) of the magnetic field circuit non-forming material  34  with respect to the magnetic field circuit forming material  32 B between the pressure heating device  44  and the pressure heating device  46  for pressurization. Further, in the electric field heating step S 16 , the pressure heating device  42  and the pressure heating device  44  applies an electric field for heating while interposing a region around the end surface of the magnetic field circuit forming material  32 B on the second side in the Y-axis direction that is joined to the magnetic field circuit non-forming material  34 , that is, a region where the electromagnetic field heat generating body  47  such as metal is disposed between the pressure heating device  42  and the pressure heating device  44  for pressurization. 
     In the electric field heating step S 16 , the pressure heating devices  42 ,  44 , and  46  applies an electric field such that the electromagnetic field heat generating bodies  47  and  48  such as metal disposed in the electric field heating preparation step  15  generates heat. As a result, in the electric field heating step S 16 , the second resin included in the magnetic field circuit non-forming material  34  that is disposed in contact with the electromagnetic field heat generating body  48  such as metal reacts such that the surface of the magnetic field circuit non-forming material  34  facing the member  36  is deformed according to the shape of the surface of the member  36  facing the magnetic field circuit non-forming material  34  and joined to the member  36 . 
     Further, in the electric field heating step S 16 , the first resin included in the portion of the magnetic field circuit forming material  32 B that is disposed in contact with the electromagnetic field heat generating body  47  such as metal reacts again such that the joining with the magnetic field circuit non-forming material  34  that is deformed according to the shape of the surface of the member  36  facing the magnetic field circuit non-forming material  34  can be stably formed with higher strength. 
     It is preferable that the pressure heating devices  42 ,  44 , and  46  have the same configuration as the above-described pressure heating devices  22 ,  24 , and  26 . 
     In the electric field heating step S 16 , by causing the second resin included in the magnetic field circuit non-forming material  34  to react more predominantly than the first resin included in the magnetic field circuit forming materials  32 A and  32 B using the electromagnetic field heat generating body  48  such as metal, the portion where the electromagnetic field heat generating body  47  such as metal is not provided can be maintained in a state where the first resin included in the magnetic field circuit forming materials  32 A and  32 B is less likely to react than the second resin included in the magnetic field circuit non-forming material  34 . Further, in the electric field heating step S 16 , only the heated portion has to be pressurized. For example, as in the rectangular shape of the pressure heating devices  42 ,  44 , and  46 , a mold relating to forming can be simplified. 
     In the electric field heating step S 16 , the first resin included in the magnetic field circuit forming materials  32 A and  32 B is less likely to be heated than the second resin included in the magnetic field circuit non-forming material  34  except for the portion that is heated by heat generated from the electromagnetic field heat generating body  47  such as metal. Therefore, in the electric field heating step  316 , for example, the shape of the magnetic field circuit forming materials  32 A and  32 B is not likely to collapse, and the shape can be stably maintained. 
     The details of the second heating step vary depending on the heating form determined in the second heating preparation step. For example, in the second heating step, depending on the heat generating material disposed in the second heating preparation step, a magnetic field may be applied, an electric field may be applied, or an electromagnetic wave may be irradiated. In these cases, in the second heating step, as a heating device, a magnetic field application device that applies a magnetic field, an electric field application device that applies an electric field, or an electromagnetic wave irradiation device that irradiates an electromagnetic wave can be appropriately used depending on the respective heating forms. In addition, depending on the heating form of the second heating step, for example, a warm air heating device or an infrared heating device can be appropriately used. 
     In the embodiment, the case where the magnetic field heating step S 14  is adopted as the first heating step and the electric field heating step S 16  is adopted as the second heating step has been mainly described, but the present invention is not limited thereto. The heating forms of the first heating step and the second heating step may be the same. In this case, it is preferable that the second heating preparation step is favorably performed such that conditions such as the intensities a magnetic field, an electric field, and an electromagnetic wave and the heating temperature in the heating form of the second heating step have a weaker effect than conditions such as the intensities a magnetic field, an electric field, and an electromagnetic wave and the heating temperature in the heating form of the first heating step. In this case, in the second heating step, the first resin that reacts predominantly in the first heating step can be inhibited from reacting again. 
       FIG. 5  is a schematic diagram illustrating a composite material  50  as an example of the composite material according to the embodiment of the present invention that is formed through the steps including up to the electric field heating step S 16  of  FIG. 1 . As illustrated in  FIG. 5 , the composite material  50  includes magnetic field circuit forming materials  52 A and  52 B as the first material, a magnetic field circuit non-forming material  54  as the second material, and another member  56 . The magnetic field circuit forming materials  52 A and  52 B, the magnetic field circuit non-forming material  54 , and the member  56  are joined along the Z-axis direction as a longitudinal direction by being disposed along the longitudinal direction and assembled. The composite material  50  has a shape in which the magnetic field circuit forming materials  52 A and  52 B, the magnetic field circuit non-forming material  54 , and the member  56  are joined along the longitudinal direction. Therefore, only the portion where the magnetic field circuit forming materials  52 A and  52 B are disposed has a shape where it is not likely to be heated even when a magnetic field, an electric field, an electromagnetic wave, or the like is applied thereto. 
     The magnetic field circuit forming material  52 A is formed when the magnetic field circuit forming material  32 A passes through the electric field heating step S 16  such that the joining between the shape of the magnetic field circuit forming material  32 A and the magnetic field circuit forming material  32 B is maintained while the first resin included in the magnetic field circuit forming material  32 A is less likely to react again than the second resin included in the magnetic field circuit non-forming material  34 . In the magnetic field circuit forming material  52 B, a portion where the electromagnetic field heat generating body  47  such as metal is not formed in the electric field heating preparation step S 15  is formed when the magnetic field circuit forming material  32 B passes through the electric field heating step  316  such that the joining between the shape of the magnetic field circuit forming material  32 B and the magnetic field circuit forming material  32 A is maintained while the first resin included in the magnetic field circuit forming material  32 B is less likely to react again than the second resin included in the magnetic field circuit non-forming material  34 . In the magnetic field circuit forming material  52 B, a portion where the electromagnetic field heat generating body  47  such as metal is provided in the electric field heating preparation step S 15  is formed when the magnetic field circuit forming material  32 B passes through the electric field heating step S 16  such that the first resin included in the magnetic field circuit forming material  32 B reacts again, the shape of the magnetic field circuit forming material  32 B is improved, and the joining between the magnetic field circuit forming material  32 B and the magnetic field circuit non-forming material  34  is improved. For example, in the magnetic field circuit forming material  52 B, in the portion where the electromagnetic field heat generating body  47  such as metal is provided in the electric field heating preparation step S 15 , the first resin included in the magnetic field circuit forming material  32 B and the second resin included in the magnetic field circuit non-forming material  34  are mixed through the reaction such that the shape and the joining are improved as described above. 
     The magnetic field circuit non-forming material  54  is formed when the magnetic field circuit non-forming material  34  passes through the electric field heating step S 16  such that the second resin included in the magnetic field circuit non-forming material  34  reacts more predominantly than the first resin included in the magnetic field circuit forming materials  32 A and  32 B, the joining with the magnetic field circuit forming material  32 B is improved, and the magnetic field circuit non-forming material  34  is formed according to the shape of the member  36  and is joined to the member  36 . The member  56  is formed when the member  36  passes through the electric field heating step S 16  such that the second resin included in the magnetic field circuit non-forming material  34  reacts as described above and the magnetic field circuit non-forming material  34  is joined to the member  36 . 
     Although the composite material  50  has the above-described shape, this way, most part of the first resin included in the magnetic field circuit forming materials  52 A and  52 B and the second resin included in the magnetic field circuit non-forming material  54  react predominantly only once. Therefore, in the composite material  50 , by causing the second resin included in the magnetic field circuit non-forming material  54  to react more predominantly than the first resin included in the magnetic field circuit forming materials  52 A and  52 B in a state where most part of the first resin included in the magnetic field circuit forming materials  52 A and  52 B is inhibited from reacting predominantly again, the magnetic field circuit non-forming material  54  can be joined to the member  56 . 
     The composite material forming method and the composite material precursor  30  according to the embodiment has the above-described configuration. Therefore, by performing heating under a predetermined condition using the first material including the first resin that reacts under the predetermined condition and the second material including the second resin that is less likely to react under the predetermined condition, the first resin reacts more predominantly than the second resin, and the state where the second resin is less likely to react can be maintained. Therefore, regarding the composite material forming method and the composite material precursor  30  according to the embodiment, the composite material that is formed by causing the first resin to react can be easily used in a state where it is joined to another member in the portion of the second material including the second resin. Further, regarding the composite material forming method and the composite material precursor  30  according to the embodiment, only the heated portion has to be pressurized, and thus a mold relating to forming can be simplified. 
     In addition, regarding the composite material forming method and the composite material precursor  30  according to the embodiment, the magnetic field circuit forming materials  12 A and  12 B in which a magnetic field circuit is formed are prepared as the first material, the magnetic field circuit non-forming material  14  in which a magnetic field circuit is not formed is prepared as the second material, and a magnetic field is applied for heating as the condition where the first resin reacts more predominantly than the second resin. Therefore, with the composite material forming method and the composite material precursor  30  according to the embodiment, by applying a magnetic field for heating to the magnetic field circuit forming materials  12 A and  12 B that is heated by the magnetic field and the magnetic field circuit non-forming material  14  that is not heated by the magnetic field such that the first resin included in the magnetic field circuit forming materials  12 A and  12 B reacts more predominantly than the second resin included in the magnetic field circuit non-forming material  14 , a state where the second resin included in the magnetic field circuit non-forming material  14  is less likely to react can be favorably maintained. Therefore, regarding the composite material forming method and the composite material precursor  30  according to the embodiment, the composite material that is formed by causing the first resin to react can be easily used in a state where it is joined to another member in the portion of the magnetic field circuit non-forming material  14  including the second resin. Further, regarding the composite material forming method and the composite material precursor  30  according to the embodiment, only the heated portion has to be pressurized, and thus a mold relating to forming can be simplified. 
     Regarding the composite material forming method and the composite material  50  according to the embodiment, the heat generating material is disposed in the second material such that heating can be performed under a condition where the second resin reacts more predominantly than the first resin. Next, the second material in which the heat generating material is disposed is heated under a condition where the second resin reacts more predominantly than the first resin. As a result, by causing the second resin included in the second material to react more predominantly than the first resin included in the first material in a state where the first resin included in the first material is less likely to react, the second material can be joined to another member. Therefore, regarding the composite material forming method and the composite material  50  according to the embodiment, the composite material that is formed by causing the first resin to react can be more easily used in a state where it is joined to another member in the portion of the second material including the second resin. Further, regarding the composite material forming method and the composite material  50  according to the embodiment, only the heated portion has to be pressurized, and thus a mold relating to joining to another member can be simplified. 
     In addition, regarding the composite material forming method and the composite material  50  according to the embodiment, the electromagnetic field heat generating bodies  47  and  48  such as metal are disposed as the heat generating material, and an electric field is applied for heating as the condition where the second resin reacts more predominantly than the first resin. Therefore, regarding the composite material forming method and the composite material  50  according to the embodiment, the electromagnetic field heat generating bodies  47  and  48  such as metal are disposed in the magnetic field circuit non-forming material  34 , and an electric field is applied for heating. As a result, by causing the second resin included in the magnetic field circuit non-forming material  34  to react more predominantly than the first resin included in the magnetic field circuit forming materials  32 A and  32 B in a state where the first resin included in the magnetic field circuit forming materials  32 A and  32 B is less likely to react, the magnetic field circuit non-forming material  34  can be favorably joined to the member  36 . Therefore, regarding the composite material forming method and the composite material  50  according to the embodiment, the composite material that is formed by causing the first resin to react can be easily used in a state where it is joined to the member  36  in the portion of the magnetic field circuit non-forming material  34  including the second resin. Further, regarding the composite material forming method and the composite material  50  according to the embodiment, only the heated portion has to be pressurized, and thus a mold relating to joining to another member can be simplified. 
     Regarding the composite material forming method, the composite material precursor  30 , and the composite material  50  according to the embodiment, the reaction temperature of the second resin is higher than that of the first resin, and heating is performed at a temperature that is higher than or equal to the reaction temperature of the first resin and lower than the reaction temperature of the second resin in order to form the composite material precursor  30 . Regarding the composite material forming method, the composite material precursor  30 , and the composite material  50  according to the embodiment, heating is further performed under a condition where the first resin reacts more predominantly than the second resin, for example, a magnetic field is applied for heating. As a result, by causing the first resin included in the magnetic field circuit forming materials  12 A and  12 B as the first material to react more predominantly than the second resin included in the magnetic field circuit non-forming material  14  as the second material, a state where the second resin included in the magnetic field circuit non-forming material  14  as the second material is less likely to react than the first resin included in the magnetic field circuit forming materials  12 A and  12 B as the first material can be easily maintained. Therefore, regarding the composite material forming method, the composite material precursor  30 , and the composite material  50  according to the embodiment, the composite material precursor  30  that is formed by causing the first resin to react can be easily used in a state where it is joined to the member  36  in the portion of the magnetic field circuit non-forming material  34  as the second material including the second resin. 
     Regarding the composite material forming method, the composite material precursor  30 , and the composite material  50  according to the embodiment, the magnetic field circuit for materials  12 A and  12 B as the first material and the magnetic field circuit non-forming material  14  as the second material are disposed along the longitudinal direction and assembled. Therefore, regarding the composite material forming method, the composite material precursor  30 , and the composite material  50  according to the embodiment, the composite material precursor  30  that is formed by causing the first resin to react can be easily used in a state where it is joined to the member  36  in the portion of the magnetic field circuit non-forming material  34  as the second material including the second resin, and a mold relating to forming can be simplified, the composite material precursor  30  having a shape for which it is difficult to apply a magnetic field for heating to only the portion in which the magnetic field circuit forming materials  12 A and  12 B as the first material including the first resin are disposed. 
     REFERENCE SIGNS LIST 
       12 A,  12 B,  32 A,  32 B,  52 A,  52 B: magnetic field circuit forming material 
       14 ,  34 ,  54 : magnetic field circuit non-forming material 
       22 ,  24 ,  26 ,  42 ,  44 ,  46 : pressure heating device 
       30 : composite material precursor 
       36 ,  56 : member 
       47 ,  48 : electromagnetic field heat generating body such as metal 
       50 : composite material