Patent Publication Number: US-2019186192-A1

Title: Vacuum insulated glass units and methodology for manufacturing the same

Description:
This application is a divisional of U.S. application Ser. No. 15/336,879, filed Oct. 28, 2016, which claims the benefit of priority under 35 U.S.C. § 119 of U.S. Provisional Application Ser. No. 62/248,715 filed on Oct. 30, 2015, the content of which is relied upon and incorporated herein by reference in its entirety. 
    
    
     BACKGROUND 
     The present disclosure relates to vacuum insulated glass units. More specifically, the present disclosure introduces technology for vacuum insulated glass units and vacuum insulated glass units with chemically etched glass spacers and bonded glass panes. 
     BRIEF SUMMARY 
     According to the subject matter of the present disclosure, a vacuum insulated glass unit includes a first glass pane, a second glass pane, and a pane bonding layer. In embodiments, the first and second glass panes each include a vacuum chamber side opposite an outer side. In embodiments, the vacuum chamber side of the first glass pane includes an etched interior surface, a glass pane periphery having a periphery surface, and a plurality of glass spacers each having an end surface. In embodiments, the pane bonding layer is positioned between and bonded with the periphery surface of the glass pane periphery of the first glass pane and the vacuum chamber side of the second glass pane, such that the pane bonding layer couples the first glass pane to the second glass pane. In embodiments, each end surface of the plurality of glass spacers and the periphery surface of the glass pane periphery are offset from the etched interior surface such that a vacuum chamber is disposed between the etched interior surface of the first glass pane and the vacuum chamber side of the second glass pane. 
     In accordance with one embodiment of the present disclosure, a method of manufacturing a vacuum insulated glass unit is disclosed. In embodiments, the method includes depositing a pane bonding layer onto a vacuum chamber side of a first glass pane. In embodiments, the method includes depositing an etching mask layer onto a plurality of masking locations along the vacuum chamber side of the first glass pane such that the pane bonding layer is positioned between the first glass pane and the etching mask layer. In embodiments, the method includes contacting the vacuum chamber side of the first glass pane with a chemical etchant to remove a depth of glass pane material and remove the pane bonding layer from unmasked portions of the vacuum chamber side of the first glass pane, such that the vacuum chamber side of the first glass pane includes an etched interior surface, a glass pane periphery, and a plurality of glass spacers. In embodiments, the plurality of glass spacers and the glass pane periphery extend from the etched interior surface. In embodiments, the pane bonding layer is positioned on the glass pane periphery. In embodiments, the method further includes removing the etching mask layer and bonding a second glass pane with the pane bonding layer positioned on the glass pane periphery of the first glass pane. 
     In accordance with another embodiment of the present disclosure, a method of manufacturing a vacuum insulated glass unit. In embodiments, the method includes depositing an etching mask layer onto a plurality of masking locations along a vacuum chamber side of a first glass pane. In embodiments, the method includes contacting the vacuum chamber side of the first glass pane with a chemical etchant to remove a depth of glass pane material from unmasked portions of the vacuum chamber side of the first glass pane, such that the vacuum chamber side of the first glass pane includes an etched interior surface, a glass pane periphery, and a plurality of glass spacers. In embodiments, the plurality of glass spacers and the glass pane periphery extend from the etched interior surface. In embodiments, the method includes removing the etching mask layer. In embodiments, the method includes positioning a second glass pane having a low-emissivity layer on a vacuum chamber side of the second glass pane in contact with the glass pane periphery of the first glass pane. In embodiments, the method includes irradiating the low-emissivity layer of the second glass pane contacting the glass pane periphery of the first glass pane with a bonding laser to fuse the low-emissivity layer contacting the glass pane periphery and seal the first glass pane to the second glass pane. 
     Although the concepts of the present disclosure are described herein with primary reference to some specific vacuum insulated glass unit configurations, it is contemplated that the concepts will enjoy applicability to vacuum insulated glass units having any configuration. 
    
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS 
       The following detailed description of specific embodiments of the present disclosure can be best understood when read in conjunction with the following drawings, where like structure is indicated with like reference numerals and in which: 
         FIG. 1  is a schematic cross-sectional illustration of a vacuum insulated glass unit having a pane bonding layer positioned between a first glass pane and a second glass pane, according to one or more embodiments shown and described herein; 
         FIG. 2  is a schematic cross-sectional illustration of a vacuum insulated glass unit having an anti-friction layer positioned between a first glass pane and a second glass pane, according to one or more embodiments shown and described herein; 
         FIG. 3  is a schematic cross-sectional illustration of a vacuum insulated glass unit having a low-emissivity layer positioned between a first glass pane and a second glass pane, according to one or more embodiments shown and described herein; 
         FIG. 4A  is a schematic cross-sectional illustration of a first glass pane for use in a method of manufacturing the vacuum insulated glass units of  FIGS. 1-3 , according to one or more embodiments shown and described herein; 
         FIG. 4B  is a schematic cross-sectional illustration of a pane bonding layer positioned on the first glass pane of  FIG. 4A , according to one or more embodiments shown and described herein; 
         FIG. 4C  is a schematic cross-sectional illustration of an anti-friction layer positioned on the first glass pane of  FIG. 4A , according to one or more embodiments shown and described herein; 
         FIG. 4D  is a schematic cross-sectional illustration of an etching mask layer positioned on the first glass pane of  FIG. 4A , according to one or more embodiments shown and described herein; 
         FIG. 4E  is a schematic cross-sectional illustration of the first glass pane of  FIGS. 4A-4D  after contact with a chemical etchant, according to one or more embodiments shown and described herein; 
         FIG. 4F  is a schematic cross-sectional illustration of the chemically etched first glass pane of  FIG. 4E  after removal of the etching mask layer, according to one or more embodiments shown and described herein; 
         FIG. 4G  is a schematic cross-sectional illustration of a second glass pane in contact with the chemically etched first glass pane of  FIG. 4F , according to one or more embodiments shown and described herein; and 
         FIG. 5  is schematic illustration of a vacuum chamber side of a first glass pane having an etching mask layer positioned at a plurality of making locations, according to one or more embodiments shown and described herein. 
     
    
    
     DETAILED DESCRIPTION 
       FIG. 1  is a schematic illustration of a vacuum insulated glass unit  100 . The vacuum insulated glass unit  100  comprises a first glass pane  110 , a second glass pane  120 , and a pane bonding layer  140 . The first and second glass panes  110 ,  120  each include a vacuum chamber side  112 ,  122  opposite an outer side  114 ,  124 . The vacuum chamber side  112  of the first glass pane  110  may comprise an etched interior surface  118 , a glass pane periphery  116 , and a plurality of glass spacers  130  each comprising an end surface  132 . The glass pane periphery  116  may be located along a perimeter  119  of the first glass pane  110  and includes a periphery surface  117 . The plurality of glass spacers  130  and the glass pane periphery  116  may extend integrally from the etched interior surface  118 . The glass pane periphery  116  may terminate at the periphery surface  117  and the plurality of glass spacers  130  each terminate at the end surface  132 . Further, each end surface  132  of the plurality of glass spacers  130  and the periphery surface  117  of the glass pane periphery  116  are offset from the etched interior surface  118  such that a vacuum chamber  102  is disposed between the etched interior surface  118  of the first glass pane  110  and the vacuum chamber side  122  of the second glass pane  120 . In embodiments, each end surface of the plurality of glass spacers is substantially flat. In embodiments, each end surface of the plurality of glass spacers has a radius of curvature greater than 2600 microns. In embodiments, the glass pane including the etched surface provides for visible light transmission there thorough within +/−5% transmission of the glass pane before etching. 
     The pane bonding layer  140  is positioned between and bonded with the periphery surface  117  of the first glass pane  110  and the vacuum chamber side  122  of the second glass pane  120 , such that the pane bonding layer  140  couples the first glass pane  110  to the second glass pane  120 . The pane bonding layer  140  may also be disposed on the end surfaces  132  of the plurality of glass spacers  130 . The pane bonding layer  140  may comprise a low melting point glass, a glass frit, a low-emissivity material (e.g., the material of a low-emissivity layer  144 ), a metal solder, such as indium solder, an inorganic material, such as, SnO 2 , ZnO, TiO 2 , ITO, Zn, Ce, Pb, Fe, VA, Cr, Mn, Mg, Ge, SnF 2 , ZnF 2 , and combinations thereof. Further, the pane bonding layer  140  may comprise a thickness of between about 0.1 μm and about 300 μm, for example, 1 μm, 3 μm, 5 μm, 10 μm, 15 μm, 25 μm, 50 μm, and for example, between about 0.5 μm and about 100 μm. 
     The pane bonding layer  140  may be compositionally configured to fuse upon absorption of radiation at wavelengths between about 300 nm and about 1600 nm, for example, between about 750 nm to about 1600 nm, between about 420 nm to about 750 nm, or the like, output by a bonding laser operating at between about 1 W and about 25 W, for example, between about 10 W and about 20 W and bond the first glass pane  110  to the second glass pane  120 . Further, a wavelength of absorption or wavelength range of absorption may be predetermined based on the material of the pane bonding layer  140 , such that at least about 10% of the laser energy output by the bonding laser is absorbed by the pane bonding layer  140 . 
     The pane bonding layer  140  may also be compositionally configured to bond the first glass pane  110  to the second glass pane  120  upon exposure to ultrasonic energy (e.g., ultrasonic energy between about 10 kHz and about 100 MHz) or upon exposure to heat, such as heat applied by a furnace at a temperature less than or equal to a softening temperature of soda lime glass, for example, between about 250° C. and about 750° C. Further, the pane bonding layer  140  may comprise a softening temperature within a range of temperatures that are at least partially exclusive of a range of softening temperatures of each of the first and second glass panes  110 ,  120 . For example, the pane bonding layer  140  may comprise a softening temperature lower than a softening temperature of the first and second glass panes  110 ,  120 , such that the plug bonding layer  180  may fuse without deforming adjacent portions of the first and second glass pane  110 ,  120 . 
     The first glass pane  110  and the second glass pane  120  may comprise any glass composition suitable as a vacuum insulated window. For example, the first and second glass panes  110 ,  120  may comprise soda-lime glass, such as, soda-lime float glass, alumino silicate glass, borosilicate glass, Gorilla® Glass, or the like. The first glass pane  110  and the second glass pane  120  may also comprise tempered glass, such as heat tempered glass, chemically tempered glass, or the like. The first and second glass panes  110  may also comprise any thickness, for example, between about 3 mm and about 12 mm, such as 4 mm, 6 mm, 8 mm, or the like. The first and second glass panes  110 ,  120  may have the same thickness or may have different thicknesses. For example, when the first glass pane  110  comprises the etched interior surface  118 , the thickness of the etched interior surface  118  may be equal to the thickness of the second glass pane  120 , for example about 3 mm. Further, before the etched interior surface  118  is etched into the first glass pane  110 , the first glass pane  110  may be thicker than the second glass pane  120 . For example, the pre-etched first glass pane  110  may comprise a thickness of about 5 mm and the second glass pane  120  may comprise a thickness of about 3 mm. 
     Referring still to  FIG. 1 , the plurality of glass spacers  130  are positioned in a spacer array such that each glass spacer  130  is positioned between about 10 mm and about 100 mm from an adjacent glass spacer, for example, 20 mm, 30 mm, 40 mm, or the like, or between about 10 mm and about 50 mm. It should be understood that any spacer array configuration is contemplated. Further, the end surfaces  132  of the plurality of glass spacers  130  are each offset from the etched interior surface  118 , for example, between about 50 μm and about 300 μm, such as between about 80 μm and about 200 μm. Moreover, the end surfaces  132  may comprise a cross sectional diameter or cross sectional length and/or width between about 50 μm and about 300 μm, for example, between about 100 μm and about 200 μm. Alternatively, the plurality of glass spacers  130  may be formed according to the laser-induced methods provided in U.S. Patent Publication 2012/0247063 the entire contents of which is incorporated by reference herein. 
     In operation, the plurality of glass spacers  130  are structurally configured to maintain separation of the first glass pane  110  and the second glass pane  120  when the vacuum chamber  102  comprises a pressure below atmospheric pressure, for example, after gas is removed from the vacuum chamber  102 . In one embodiment, end surface  132  of the plurality of glass spacers  103  etched from first glass pane  110  contact the second glass pane  120  to maintain separation. 
     The plurality of glass spacers  130  may each comprise a compressive strength of between about 5 MPa and about 50 MPa, such as about 10 MPa, 20 MPa, 25 MPa, 35 MPa, 45 MPa, or the like. At least one of the plurality of glass spacers  130  may comprise a load resistance of 1800 kilograms or more, 2000 kilograms or more, of 3600 kilograms or more, or from about 1800 kilograms to about 3600 kilograms. In embodiments, the load resistance of a glass spacer  130  is confirmed when the glass spacer is not cracked, crushed, or irreversibly deformed by the above disclosed applied load normal to an end surface thereof. When the plurality of glass spacers  130  comprising increased compressive strength (e.g., when both glass panes are heat tempered) or increased load resistance, fewer glass spacers  130  may be needed to maintain separation of the first glass pane  110  and the second glass pane  120 , reducing the thermal transmittance across the vacuum insulated glass unit  100 . Increasing the compressive strength or load resistance of the plurality of glass spacers  130  may also increase the lifetime of the vacuum insulated glass unit  100 . Further, the plurality of glass spacers  130  may comprise a thermal transmittance of between about 0.2 W/mK and about 1.4 W/mK, such as about 0.6 W/mK, about 0.7 W/mK about 1 W/mK, about 1.1 W/mK, or the like. Moreover, the end surfaces  132  of the plurality of glass spacers  130  may each comprise a surface roughness of between about 0.02 μm/20 mm peak-to-peak and about 0.3 μm/20 mm peak-to-peak. For example, the end surfaces  132  of the glass spacers  130  may each comprise a surface roughness equal to a surface roughness of the vacuum chamber side  112 ,  122  of the first and second glass panes  110 ,  120 . 
     Referring now to  FIG. 2 , the vacuum insulated glass unit  100  may comprise an anti-friction layer  142  positioned on the end surface  132  of at least one of the plurality of glass spacers  130 . The anti-friction layer  142  may be positioned directly on the end surfaces  132  of the plurality of glass spacers  130 . Further, the pane bonding layer  140  may be positioned between the end surfaces  132  of the plurality of glass spacers  130  and the anti-friction layer  142  ( FIGS. 4E-4G ). The anti-friction layer  142  may comprise a transparent or an opaque material, for example, WS 2 , MoS 2 , or combinations thereof. Moreover, the anti-friction layer  142  may comprise any material compositionally configured to reduce the friction between glass components, for example, between the end surfaces  132  of the plurality of glass spacers  130  and the vacuum chamber side  122  of the second glass pane  120 . 
     In operation, the vacuum insulated glass unit  100  may be located in variable thermal environments, which may cause thermal expansion and retraction of the vacuum insulated glass unit  100 . For example, when the vacuum insulated glass unit  100  is installed in a structure, one of the first or second glass panes  110 ,  120  may face the interior of the structure and the other of the first or second glass panes  110 ,  120  may face the exterior environment, creating a thermal gradient which may cause thermal expansion and retraction of the first and second glass panes  110 ,  120 . The anti-friction layer  142  may reduce or prevent damage to the first and/or second glass panes  110 ,  120  caused by the relative motion of the glass spacers  130  along the vacuum chamber side  122  of the second glass pane  120  due to thermal expansion and retraction. 
     Referring now to  FIG. 3 , the low-emissivity layer  144  may be positioned on the vacuum chamber side  112  of the first glass pane  110 , the vacuum chamber side  122  of the second glass pane  120 , or both. The low-emissivity layer  144  may comprise a tin oxide, such as indium tin oxide or fluorine doped tin oxide, silver, metallic silver, metallic nickel, silicon nitride, zirconium oxide, zinc oxide, gold oxide, or combinations thereof. The low-emissivity layer  144  is compositionally configured to reflect radiant heat and permit transmission of visible radiation upon exposure to solar radiation. Further, the low-emissivity layer  144  may be deposited on and engaged with the vacuum chamber side  112  of the first glass pane  110  and the vacuum chamber side  122  of the second glass pane  120  and may be used as the pane bonding layer  140  to hermetically seal the vacuum chamber  102 . The low-emissivity layer  144  may be deposited using a sputtering process, mechanical deposition process, a manual deposition process, a chemical vapor deposition, a pyrolysis processes, a spray coating process, a photolithographic process, a screen printing process, a 3D printing process, an inkjet printing process, such as a piezoelectric inkjet printing process, or a combination thereof. 
     For example, the low-emissivity layer  144  may be compositionally configured to fuse upon absorption of radiation at wavelengths between about 300 nm and about 1600 nm, for example, between about 750 nm to about 1600 nm, between about 420 nm to about 750 nm, or the like, output by a bonding laser operating at between about 1 W and about 25 W, for example, between about 10 W and about 20 W and bond the first glass pane  110  to the second glass pane  120 . The low-emissivity layer  144  may also be compositionally configured to bond the first glass pane  110  to the second glass pane  120  upon exposure to ultrasonic energy (e.g., ultrasonic energy between about 10 kHz and about 100 MHz) or upon exposure to heat, such as heat applied by a furnace at a temperature less than or equal to a softening temperature of soda lime glass, for example, between about 250° C. and about 750° C. 
     Referring now to  FIGS. 4A-4G , a method of manufacturing the vacuum insulated glass unit  100  is schematically depicted. The method is depicted in  FIGS. 4A-4G  as comprising a number of steps, however, it should be understood that other non-depicted steps may be contemplated. While the steps of the method are described in a particular order, other orders are contemplated. Further, while  FIGS. 4A-4G  depict a method of manufacturing a planar vacuum insulated glass unit  100 , the method may also be applied to the manufacture of a curved vacuum insulated glass unit comprising curved glass panes. 
     Referring now to  FIGS. 4A and 4B , the method may first comprise depositing the pane bonding layer  140  onto the vacuum chamber side  112  of the first glass pane  110 . The pane bonding layer  140  may be deposited onto the vacuum chamber side  112  of the first glass pane  110  using a sputtering process, mechanical deposition process, a manual deposition process, a chemical vapor deposition, a pyrolysis processes, a spray coating process, a photolithographic process, a screen printing process, a 3D printing process, an inkjet printing process, such as a piezoelectric inkjet printing process, or a combination thereof. 
     Referring now to  FIG. 4C , the method may further comprise depositing an anti-friction mask layer  160  (e.g., a masking layer for blocking deposition of the anti-friction layer  142 ) along the perimeter  119  of the vacuum chamber side  112  of the first glass pane  110 , for example, onto the portion of the pane bonding layer  140  positioned along the perimeter  119  of the first glass pane  110 . The anti-friction mask layer  160  may comprise any material compositionally configured to block the anti-friction layer  142  from contacting and engaging the first and second glass panes  110 ,  120 , for example, masking tape or other temporary masking adhesive, polysilicon, amorphous silicon, silicon carbide, titanium nitride, inkjet printed masks (e.g., acrylate n-vinylcaprolactam), acrylate polymers, or a combination thereof. The anti-friction mask layer  160  may be deposited using a mechanical deposition process, a manual deposition process, a chemical vapor deposition process, a photolithographic process, a screen printing process, a 3D printing process, an inkjet printing process, such as a piezoelectric inkjet printing process, or a combination thereof. 
     Next, referring still to  FIG. 4C , the anti-friction layer  142  may be deposited onto the vacuum chamber side  112  of the first glass pane  110 . The anti-friction layer  142  may be deposited using a mechanical deposition process, a manual deposition process, a chemical vapor deposition process, a photolithographic process, a screen printing process, a 3D printing process, an inkjet printing process, such as a piezoelectric inkjet printing process, or a combination thereof. The anti-friction layer  142  may be deposited onto the vacuum chamber side  112  of the first glass pane  110  at locations corresponding to the etched interior surface  118  and the plurality of glass spacers  130  of the manufactured vacuum insulated glass units  100  depicted in  FIGS. 1-3 , such that the end surfaces  132  of the plurality of glass spacers  130  may comprise the anti-friction layer  142  after the manufacturing process is completed. Further, by first depositing the anti-friction mask layer  160  along the perimeter  119  of the vacuum chamber side  112  of the first glass pane  110 , the anti-friction layer  142  may be prevented from engaging with portions of the vacuum chamber side  112  positioned along the perimeter  119 . This allows the pane bonding layer  140  to be positioned between the first and second glass panes  110 ,  120  without the anti-friction layer  142  separating the pane bonding layer  140  from the first and second panes  110 ,  120 . 
     Referring now to  FIG. 4D , an etching mask layer  150  may be deposited onto a plurality of masking locations  152  along the vacuum chamber side  112  of the first glass pane  110  such that the pane bonding layer  140  is positioned between the first glass pane  110  and the etching mask layer  150 . The etching mask layer  150  may comprise any material compositionally configured to block a chemical etchant from contacting the first and second glass panes  110 ,  120 , for example, aluminum, polysilicon, amorphous silicon, silicon carbide, titanium nitride, inkjet printed masks (e.g., acrylate n-vinylcaprolactam), masking tape, acrylate polymers, or a combination thereof. In embodiments, etching mask layer  150  may also include ultraviolet (UV) or heat curable polymers. The etching mask layer  150  may be deposited using a mechanical deposition process, a manual deposition process, a chemical vapor deposition process, a photolithographic process, a screen printing process, a 3D printing process, an inkjet printing process, such as a piezoelectric inkjet printing process, or a combination thereof. 
     Referring also to  FIG. 5 , the masking locations  152  may correspond to locations along the vacuum chamber side  122  where the end surfaces  132  of the plurality of glass spacers  130  and the periphery surface  117  of the glass pane periphery  116  are each desired. For example, the etching mask layer  150  may be deposited along the perimeter  119  of the first glass pane  110  and may be deposited at a number of discrete locations corresponding to the spacer array of the plurality of glass spacers  130 . Further, the etching mask layer  150  and the anti-friction mask layer  160  may comprise the same masking material or may comprise different masking materials. When the etching mask layer  150  and the anti-friction mask layer  160  comprise the same material, the anti-friction mask layer  160  may not need to be removed before the etching mask layer  150  is deposited onto the plurality of masking locations  152 . For example, the anti-friction mask layer  160  may remain along the perimeter  119  and the etching mask layer  150  may be deposited at the plurality of masking locations  152  corresponding with the desired locations of the end surfaces  132  of the plurality of glass spacers  130 . 
     Referring now to  FIG. 4E , the method of manufacturing the vacuum insulated glass unit  100  further comprises contacting the vacuum chamber side  112  of the first glass pane  110  with a chemical etchant to remove a depth of glass pane material, remove the anti-friction layer  142 , and remove the pane bonding layer  140  from unmasked portions of the vacuum chamber side  112  of the first glass pane  110 . The chemical etchant may comprise a wet chemical etchant such as hydrochloric acid (HCl), hydrofluoric acid (HF), ammonium fluoride (NH 4 F), or a combination thereof. For example, the wet chemical etchant may comprise a mixture of between about 5 and 15 parts HF and 1 part HCl, for example about 10 parts HF and about 1 part HCl. In embodiments, the wet chemical etchant may comprise a mixture a mixture from about 10 weight precent (wt. %) to about 30 wt. % HF and from about 0 wt. % to about 10 wt. % HCl. Further, the chemical etchant may comprise a plasma chemical etchant comprising carbon tetrafluoride (CF 4 ), sulfur hexafluoride (SF 6 ), nitrogen trifluoride (NF 3 ), chlorine (Cl 2 ), dichlorodifluoromethane (CCl 2 F 2 ), or a combination thereof. In embodiments, the chemical etchant is stirred or agitated (e.g., by sonication) when contacting the first glass pane  110 . 
     Methods of manufacturing the vacuum insulated glass unit  100  may further comprise contacting the first glass pane with a fluid to reduce optical distortion through the first glass pane. In embodiments, contacting the first glass pane with the fluid to reduce optical distortion there through is completed after contacting the vacuum chamber side  112  of the first glass pane  110  with a chemical etchant. In embodiments, contacting the first glass pane with the fluid improves optical quality of etched glass pane  110  or increases visible light transmission through etched glass pane  110 . The inventors have discovered that etching the first glass apne with a high concentration wet chemical etchant can diminish or distort the optical quality of or reduce visible light transmission through the glass pane. In embodiments, the fluid is configured to clean the etched surface of the glass pane or remove residual etched material from glass pane surface after the glass pane is contacted with a the chemical etchant. In embodiments, the fluid is a mineral acid. In embodiments, the fluid includes hydrochloric acid (HCl), nitric acid (HNO 3 ), sulfuric acid (H 2 SO 4 ), or combinations thereof. 
     Further, during chemical etching, the chemical etchant may undercut the masking locations  152  during the etching process. To account for this undercut, the etching mask layer  150  may extend beyond the boundaries of the masking locations  152 , for example, to cover a surface area between about 30% and about 70% larger than the surface area of the masking locations  152 . Positioning the etching mask layer  150  beyond the boundaries of the masking locations  152  facilitates formation of the plurality of glass spacers  130  comprising end surfaces  132  with a desired surface area and the formation of the glass pane periphery  116  comprising the periphery surface  117  with a desired surface area when the chemical etchant undercuts the etching mask layer  150 . 
     It is contemplated that an individual chemical etchant may be compositionally configured to remove each of the anti-friction layer  142 , the pane bonding layer  140 , and a depth of glass pane material. Moreover, it is also contemplated that multiple chemical etchants may be used to remove each of the anti-friction layer  142 , the pane bonding layer  140 , and a depth of glass pane material. For example, the method may comprise contacting the vacuum chamber side  112  with a first chemical etchant compositionally configured to remove the anti-friction layer  142  from unmasked portions of the vacuum chamber side  112  of the first glass pane  110  and contacting the vacuum chamber side  112  of the first glass pane  110  with a second chemical etchant compositionally configured to remove the pane bonding layer  140  from unmasked portions of the vacuum chamber side  112  of the first glass pane  110 . Further, the method may comprise contacting the vacuum chamber side  112  of the first glass pane  110  with a third chemical etchant compositionally configured to remove a depth of glass pane material from unmasked portions of the vacuum chamber side  112  of the first glass pane  110 . 
     As depicted in  FIGS. 4E and 4F , after the chemical etchant contacts the unmasked portions of the vacuum chamber side  112  and a depth of glass pane material has been removed from unmasked portions of the vacuum chamber side  112 , the unmasked portions of the vacuum chamber side  112  comprise the etched interior surface  118  and the masked portions (e.g., the masking locations  152  depicted in  FIG. 5 ) extend from the etched interior surface  118  and comprise the glass pane periphery  116  and the plurality of glass spacers  130 . After etching, the pane bonding layer  140  may be positioned on the periphery surface  117  of the glass pane periphery  116  and one or both of the pane bonding layer  140  and the anti-friction layer  142  may be positioned on the end surfaces  132  of the plurality of glass spacers  130 . Next, the etching mask layer  150  may be removed. In embodiments, removing the etching mask layer  150  may include contacting the etching mask layer  150  with a fluid (e.g., water) to detach the etching mask layer  150  from the glass pane. 
     Referring now to  FIG. 4G , the method of manufacturing the vacuum insulated glass unit  100  may further comprise positioning a second glass pane  120  in contact with the pane bonding layer  140  positioned on the periphery surface  117  of the first glass pane  110  and irradiating the pane bonding layer  140  positioned on the periphery surface  117  with a bonding laser to fuse the pane bonding layer  140  and seal the first glass pane  110  to the second glass pane  120 . The method may further comprise translating the bonding laser such that a contact point of the laser radiation output by the bonding laser translates along the perimeter  119  of the first glass pane  110  to fuse the pane bonding layer  140  and seal the first glass pane  110  to the second glass pane  120  along the entire perimeter  119 . For example, the bonding laser may be translated along the perimeter  119  at a rate of between about 1 mm/s and about 400 mm/s. Alternatively, the first glass pane  110  may be bonded to the second glass pane  120  according to the bonding laser methods provided in U.S. Patent Publication No. 2015/0027168 the entire content of which is incorporated by reference herein. Further, the anti-friction layer  142  may also be deposited on the vacuum chamber side  122  of the second glass pane  120 , for example, before the second glass pane  120  is bonded to the first glass pane  110 . When the anti-friction layer  142  is deposited on the vacuum chamber side  122  of the second glass pane  120 , the anti-friction layer  142  may be transparent. 
     Once the first glass pane  110  is sealed to the second glass pane  120 , gas may be removed from the vacuum chamber  102  located between the first glass pane  110  and the second glass pane  120  such that the vacuum chamber  102  comprises a pressure below atmospheric pressure to generate a vacuum within the vacuum chamber  102 . Gas may be removed from the vacuum chamber  102  using gas removal systems and methods of which may be learned from conventional or yet-to-be developed teachings related to vacuum generation and vacuum chamber evacuation, for example, the vacuum chamber evacuation methods provided in co-pending U.S. Provisional Patent Application No. 62/248,661 (Attorney Docket No. SP15-336 PZ) filed Oct. 30, 2015 entitled “VACUUM INSULATED GLASS UNIT AND PUMPING SYSTEM AND METHODOLOGY FOR EVACUATING THE SAME” the entire contents of which is incorporate by reference herein. 
     The method of manufacturing the vacuum insulated glass unit  100  may also comprise tempering one or both of the vacuum chamber side  112 ,  122  and the outer side  114 ,  124  of one or both of the first glass pane  110  and the second glass pane  120 , for example, by heat tempering the first and/or second glass panes  110 ,  120 , chemically tempering the first and/or second glass panes  110 ,  120 , or using other tempering methods. The first and second glass panes  110 ,  120  may be tempered before or after the first glass pane  110  is sealed to the second glass pane  120 . In an exemplary embodiment, when the first and second glass panes  110  are tempered before they are sealed together, irradiating the pane bonding layer  140  with the bonding laser to fuse the pane bonding layer  140  does not alter the tempering of the first and second glass panes  110 ,  120  because the bonding laser generates localized heating of the pane bonding layer  140  along the perimeter  119 . 
     As depicted in  FIG. 3 , the low-emissivity layer  144  may be used to seal the first glass pane  110  to the second glass pane  120 . Referring also to  FIGS. 4A-4G , in another method of manufacturing the vacuum insulated glass unit  100 , the pane bonding layer  140  may not need to be deposited onto the vacuum chamber side  112  and an example second glass pane  120  comprising the low-emissivity layer  144  may bond with the periphery surface  117  of the first glass pane  110  to seal the first glass pane  110  to the second glass pane  120 . The alternative method may also include positioning the anti-friction mask layer  160  along the perimeter  119  of the vacuum chamber side  112  of the first glass pane  110  then depositing the anti-friction layer  142  on the vacuum chamber side  112 . Next, the etching mask layer  150  may be deposited onto the plurality of masking locations  152  along the vacuum chamber side  112  of the first glass pane  110 . The vacuum chamber side  112  of the first glass pane  110  may then be contacted with a chemical etchant, for example, the one or more chemical etchants described above, to remove a depth of glass pane material from unmasked portions of the vacuum chamber side  112  of the first glass pane  110 , such that the vacuum chamber side  112  of the first glass pane  110  comprises the etched interior surface  118 , the glass pane periphery  116 , and the plurality of glass spacers  130 . The etching mask layer  150  may then be removed. 
     Next, the second glass pane  120  having the low-emissivity layer  144  located on the vacuum chamber side  122  of may be positioned in contact with the periphery surface  117  of the glass pane periphery  116  of the first glass pane  110 . The portion of the low-emissivity layer  144  of the second glass pane  120  contacting the periphery surface  117  of the first glass pane  110  may be irradiated with a bonding laser to fuse the portions of the low-emissivity layer  144  contacting the glass pane periphery  116  to seal the first glass pane  110  to the second glass pane  120 . The bonding laser may be translated such that a contact point (or contact area) of the laser radiation output by the bonding laser translates along the perimeter  119  of the first glass pane  110  to fuse the low-emissivity layer  144  and seal the first glass pane  110  to the second glass pane  120  along the entire perimeter  119 . 
     It is noted that recitations herein of a component of the present disclosure being “configured” in a particular way, to embody a particular property, or to function in a particular manner, are structural recitations, as opposed to recitations of intended use. More specifically, the references herein to the manner in which a component is “configured” denotes an existing physical condition of the component and, as such, is to be taken as a definite recitation of the structural characteristics of the component. 
     For the purposes of describing and defining the present invention it is noted that the term “about” is utilized herein to represent the inherent degree of uncertainty that may be attributed to any quantitative comparison, value, measurement, or other representation. The term “about” is also utilized herein to represent the degree by which a quantitative representation may vary from a stated reference without resulting in a change in the basic function of the subject matter at issue. 
     Having described the subject matter of the present disclosure in detail and by reference to specific embodiments thereof, it is noted that the various details disclosed herein should not be taken to imply that these details relate to elements that are essential components of the various embodiments described herein, even in cases where a particular element is illustrated in each of the drawings that accompany the present description. Further, it will be apparent that modifications and variations are possible without departing from the scope of the present disclosure, including, but not limited to, embodiments defined in the appended claims. More specifically, although some aspects of the present disclosure are identified herein as preferred or particularly advantageous, it is contemplated that the present disclosure is not necessarily limited to these aspects. 
     It is noted that one or more of the following claims utilize the term “wherein” as a transitional phrase. For the purposes of defining the present invention, it is noted that this term is introduced in the claims as an open-ended transitional phrase that is used to introduce a recitation of a series of characteristics of the structure and should be interpreted in like manner as the more commonly used open-ended preamble term “comprising.” 
     It is noted that, while methods are described herein as following a specific sequence, additional embodiments of the present disclosure are not limited to any particular sequence.