Melt connection method for glass, and composite glass

Abstract

The present application relates to a melt connection method for glass and a composite glass. The melt connection method for glass comprises the following steps: forming a melt connection layer between a first glass piece and a second glass piece, the material of the melt connection layer comprising glass powder, and the expansion coefficient of the glass powder being between the expansion coefficients of the first glass piece and the second glass piece; and at a preset temperature, heating the first glass piece and the second glass piece to soften the glass powder, so as to melt and connect the first glass piece and the second glass piece, the preset temperature being higher than the strain point of the first glass piece and lower than the strain point of the second glass piece. The melt connection method for glass can relieve the problems of bubbles and iridescence patterns while reducing structural stress.

Description

Glass fusion method and composite glass

[0001] Cross-reference to related applications

[0002] This application is based on and claims priority to Chinese Patent Application No. 202410739619.8, filed on June 7, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the field of glass fusion, in particular to a glass fusion method and a composite glass. BACKGROUND

[0004] Heterogeneous glass refers to glass composed of two or more materials. After fusion by thermal fusion, the glass sheet has a large structural stress, which causes the glass to easily crack. Although the traditional method can reduce the structural stress, it will also cause problems such as air bubbles and rainbow stripes. SUMMARY

[0005] Therefore, some embodiments of the present application provide a glass fusion method that can reduce structural stress while improving air bubble and rainbow stripe problems.

[0006] In addition, some other embodiments of the present application also provide a composite glass.

[0007] A glass fusion method includes the following steps:

[0008] Forming a fusion layer between the first glass piece and the second glass piece, the material of the fusion layer including glass powder, the expansion coefficient of the glass powder being between the expansion coefficients of the first glass piece and the second glass piece;

[0009] Heating the first glass piece and the second glass piece at a preset temperature to soften the glass powder and fuse the first glass piece and the second glass piece, the preset temperature being above the strain point of the first glass piece and below the strain point of the second glass piece.

[0010] In some embodiments, the preset temperature is above the glass transition temperature of the first glass piece and below the strain point of the second glass piece.

[0011] In some embodiments, the preset temperature is 30-50°C higher than the softening point of the glass powder.

[0012] In some embodiments, the preset temperature is 550-650°C.

[0013] In some embodiments, the step of heating the first glass piece and the second glass piece at a preset temperature comprises:

[0014] ramping up to the preset temperature at a ramping rate of 3°C / min to 5°C / min, holding for 20 min to 30 min, and then ramping down at a rate of 0.5°C / min to 5°C / min to below the strain point of the first glass piece.

[0015] In some embodiments, the roughness of the side surface of the first glass piece and the second glass piece facing the fusion layer is less than or equal to 1 nm.

[0016] In some embodiments, the first glass piece and the second glass piece are heated while being subjected to a pressure of 0.02 MPa to 0.04 MPa.

[0017] In some embodiments, the thickness of the fusion layer is 10 μm to 20 μm.

[0018] In some embodiments, the fusion layer further comprises a solvent, and the step of heating the first glass piece and the second glass piece at a preset temperature is preceded by a step of degassing the solvent;

[0019] Optionally, the step of degassing the solvent comprises holding at 350°C to 400°C for 15 min to 25 min.

[0020] In some embodiments, the solvent comprises one or more of a water-soluble ink vehicle, a large anti-whitening water, and terpineol.

[0021] In some embodiments, the first glass piece and the second glass piece have different shapes.

[0022] In some embodiments, the step of forming a fusion layer between the first glass piece and the second glass piece comprises:

[0023] applying a slurry containing glass powder to a surface of at least one of the first glass piece and the second glass piece to be fused;

[0024] bonding the first glass piece and the second glass piece together to form a fusion layer between the first glass piece and the second glass piece.

[0025] In some embodiments, the slurry containing glass powder is applied to the surface of at least one of the first glass piece and the second glass piece to be fused by screen printing.

[0026] In some embodiments, the screen printing has a mesh count of 300 mesh to 450 mesh.

[0027] In some embodiments, after the step of applying the glass powder-dispersed slurry on the surface to be fused of at least one of the first glass piece and the second glass piece, further comprising: drying for 10 min at 100℃.

[0028] A composite glass prepared by the glass fusing method described above.

[0029] The inventors found that, when fusing traditional heterogeneous glass, the expansion coefficient of the glass sharply rises near the strain point, causing the expansion coefficient of the two kinds of glass to sharply increase, resulting in a large internal stress, which causes the glass to easily crack. Therefore, to reduce the internal stress problem, researchers usually fuse below the strain point of the glass, but this method also causes the problems of bubbles and rainbow lines. Based on this, in some embodiments of the present application, the glass powder is used to fuse heterogeneous glass, the expansion coefficient of the glass powder is between the expansion coefficients of the two kinds of glass pieces, serving as a transition layer, which is conducive to reducing structural stress, and the fusing temperature is above the strain point of the first glass piece and below the strain point of the second glass piece, the first glass piece has a slight deformation above the strain point, making the glass powder more easily flow flat, improving the problems of bubbles and rainbow lines, and having a larger bonding strength. Therefore, the glass fusing method described above improves the problems of large structural stress, bubbles and rainbow lines in traditional heterogeneous glass fusing. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0031] FIG. 1 is a process flow diagram of a glass fusing method in some embodiments of the present application;

[0032] FIG. 2 is a structural diagram of a first glass piece and a second glass piece in some embodiments of the present application. DETAILED DESCRIPTION

[0033] In order to facilitate understanding of the present application, the present application will be more fully described below in conjunction with specific embodiments. In the specific embodiments, preferred embodiments of the present application are given. However, the present application can be implemented in many different forms, and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0035] Unless otherwise defined, or the context dictates otherwise, the terms or phrases used herein have the following meanings:

[0036] In this application, "first", "second", etc. are used only to describe specific embodiments, and can not be construed as indicating or implying relative importance or implying a specified number of technical features indicated.

[0037] In the description of the application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified.

[0038] In this application, "one or more" refers to any one, any two or any two or more of the listed items. Among them, "several" refers to any two or more.

[0039] The word "optionally" and the like in the application refers to the embodiments of the application that can provide certain beneficial effects in some cases. However, in the same or other cases, other embodiments can also be optional. In addition, the description of one or more optional embodiments does not imply that other embodiments are not available, nor is it intended to exclude other embodiments from the scope of the application.

[0040] When a numerical range is disclosed in the application, the above range is considered to be continuous, and includes the minimum value and the maximum value of the range, and each value between the minimum value and the maximum value. Further, when the range refers to an integer, each integer between the minimum value and the maximum value of the range is included. In addition, when multiple ranges are provided to describe characteristics or properties, the ranges can be combined. In other words, unless otherwise specified, all ranges disclosed in the application should be understood to include any and all sub-ranges incorporated therein.

[0041] In the application, the technical features described in an open manner include closed technical solutions consisting of listed features, and also include open technical solutions containing listed features.

[0042] The terms "comprises", "comprising", "includes", "including", "has", "having" and their conjugates, as used herein, are intended to cover the situation where individual steps or units added to the listed features are de facto essential to the process, method, system, product, or apparatus. For example, a process, method, system, product, or apparatus that comprises a list of steps or units means only that the process, method, system, product, or apparatus comprises those listed steps or units and not that it necessarily comprises any other steps or units not listed.

[0043] Reference to "an embodiment" or "the embodiment" in this application means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The appearances of the phrase "in one embodiment" or "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily all directed to the same embodiment, or to a single alternative embodiment.

[0044] In this application, "above" and "below" include the number itself, for example, a temperature above the strain point includes the temperature at the strain point, which means the temperature is greater than or equal to the strain point.

[0045] In this application, "strain point" refers to the temperature at which the viscosity of the glass is 1014.5 dPa·s, i.e., the temperature at which the internal stress of the glass can be substantially eliminated within a few hours, also known as the lower limit of the annealing temperature of the glass.

[0046] In this application, "glass transition temperature" (also referred to as Tg) refers to the temperature corresponding to the transition from the glass state to the high-elasticity state.

[0047] In this application, "softening point" refers to the temperature at which a material begins to soften and lose its strength under certain conditions.

[0048] In a first aspect, the application provides a glass fusing method, please refer to figure 1, comprising the following steps:

[0049] Step S110: Forming a fusing layer between the first glass piece and the second glass piece, the material of the fusing layer comprising glass powder, the expansion coefficient of the glass powder being between the expansion coefficients of the first glass piece and the second glass piece.

[0050] It can be understood that, unless otherwise specified, in this article, the expansion coefficient of the glass powder, the expansion coefficient of the glass piece, etc. all refer to the expansion coefficient at room temperature to high temperature fusing.

[0051] In some embodiments, the roughness (Sa) of the side surface of the first glass piece and the second glass piece towards the fusing layer is less than or equal to 1 nm. By the above setting, it is beneficial to further improve the fusing strength, improve the problems of bubbles and rainbow stripes, and thus further improve the fusing effect.

[0052] In some embodiments, the first glass piece and the second glass piece are polished to have a surface roughness Sa≤1 nm on a side surface facing the fusion layer.

[0053] In some embodiments, the thickness of the fusion layer is 10-20 μm. For example, the thickness of the fusion layer can be, but is not limited to, 10 μm, 12 μm, 14 μm, 15 μm, 16 μm, 18 μm, 20 μm, or a range defined by any two of these values.

[0054] In some embodiments, the material of the fusion layer further comprises a solvent, and the solvent comprises one or more of water-soluble ink solvent, large white-preventing water, and terpineol. The use of the above solvent makes it easier to remove the glue by heating.

[0055] In some embodiments, the step of forming the fusion layer between the first glass piece and the second glass piece comprises:

[0056] applying the glass powder-dispersed paste to a surface to be fused of at least one of the first glass piece and the second glass piece;

[0057] bonding the first glass piece and the second glass piece to form the fusion layer between the first glass piece and the second glass piece.

[0058] Specifically, the viscosity of the glass powder-dispersed paste is 7000-12000 mPa·S. For example, the viscosity of the glass powder-dispersed paste can be, but is not limited to, 7000 mPa·S, 8000 mPa·S, 9000 mPa·S, 10000 mPa·S, 11000 mPa·S, 12000 mPa·S, or a range defined by any two of these values.

[0059] In some embodiments, the glass powder-dispersed paste is applied to the surface to be fused by screen printing. Specifically, the screen printing screen has a mesh number of 300-450.

[0060] In some embodiments, after the step of applying the glass powder-dispersed paste to the surface to be fused, the method further comprises drying at 100°C for 10 min.

[0061] S120: heating the first glass piece and the second glass piece at a preset temperature to soften the glass powder and fuse the first glass piece and the second glass piece, the preset temperature being above the strain point of the first glass piece and below the strain point of the second glass piece.

[0062] The inventors have found that, when traditional heterogeneous glass is fused, the expansion coefficient of the glass sharply rises near the strain point, which causes the expansion coefficient of the two kinds of glass to sharply increase, resulting in a large internal stress, which causes the glass to easily crack. Therefore, in order to reduce the internal stress problem, researchers usually fuse the glass below the strain point of the glass, but this method also causes the problems of bubbles and rainbow lines. Based on this, in some embodiments of the present application, the heterogeneous glass is fused using glass powder, the expansion coefficient of the glass powder is between the expansion coefficients of the two kinds of glass pieces, and the glass powder acts as a transition layer, which is beneficial to reducing the structural stress, and the fusion temperature is above the strain point of the first glass piece and below the strain point of the second glass piece. The first glass piece has a slight deformation above the strain point, which makes the glass powder more easily flow flat, improves the problems of bubbles and rainbow lines, and has a greater bonding strength. Therefore, the above glass fusion method improves the problems of large structural stress, bubbles and rainbow lines existing in traditional heterogeneous glass fusion.

[0063] In some embodiments, the preset temperature is above the glass transition temperature of the first glass piece and below the strain point of the second glass piece. Through the above setting, it is beneficial to further improve the fusion effect.

[0064] It can be understood that, in the step of heating the first glass piece and the second glass piece at a preset temperature to soften the glass powder and fuse the first glass piece and the second glass piece, the preset temperature is above the softening point of the glass powder to enable the glass powder to soften and achieve fusion, i.e., the above implies that the preset temperature is above the softening point of the glass powder. Further, in some embodiments, the preset temperature is 30-50°C higher than the softening point of the glass powder. Through the above setting, it is beneficial to further improve the fusion effect.

[0065] In some embodiments, the preset temperature is 550-650°C. For example, the preset temperature can be, but is not limited to, 550°C, 560°C, 580°C, 600°C, 620°C, 640°C, 650°C, or a range consisting of any two of these values.

[0066] In some embodiments, the step of heating the first glass piece and the second glass piece at a preset temperature comprises:

[0067] heating to the preset temperature at a heating rate of 3-5°C / min, holding for 20-30 min, and then cooling to below the strain point of the first glass piece at a cooling rate of 0.5-5°C / min. Using the above setting, it is beneficial to further improve the fusion effect and improve the problems of bubbles and rainbow lines. It can be understood that, after cooling to below the strain point of the first glass piece, the furnace can be cooled down.

[0068] In some embodiments, the heating of the first glass piece and the second glass piece at the preset temperature comprises: heating at a temperature increasing rate of 3-5℃ / min to the preset temperature, holding for 20-30min, and then heating at a temperature decreasing rate of 0.5-5℃ / min to 400-500℃. For example, heating at a temperature decreasing rate of 0.5-5℃ / min to 450-480℃.

[0069] In some embodiments, the first glass piece has a smaller expansion coefficient than the second glass piece. By the above arrangement, the structural stress can be further reduced. It can be understood that in other embodiments, the first glass piece can also have a larger expansion coefficient than the second glass piece.

[0070] In some embodiments, the first glass piece and the second glass piece are heated while being subjected to a pressure of 0.02-0.04MPa. By the above arrangement, the two glass pieces can be bonded together, and the problems of bubbles and rainbow stripes can be further improved.

[0071] In some embodiments, before the heating of the first glass piece and the second glass piece at the preset temperature, the method further comprises a degassing step.

[0072] Optionally, the degassing step comprises: holding at 350-400℃ for 15-25min.

[0073] In some embodiments, the degassing step comprises: heating at a temperature increasing rate of 3-5℃ / min to 350-400℃ and holding for 15-25min.

[0074] FIG. 1 is a flowchart of a glass fusion method according to an embodiment of the present application. It should be understood that although the steps in the flowchart of FIG. 1 are shown in sequence according to the arrows, the steps are not necessarily performed in the order indicated by the arrows, unless otherwise specified herein. The steps can be performed in other orders, and at least some of the steps in FIG. 1 can comprise multiple sub-steps or multiple stages, which are not necessarily performed at the same time, but can be performed at different times, and the order of the performance of the steps is not necessarily sequential, but can be performed in rotation or alternation with at least some of the other steps or sub-steps or stages.

[0075] In some embodiments, the first glass piece and the second glass piece can be flat glass, curved glass, or other complex-shaped glass, etc.

[0076] In some embodiments, at least one of the first glass piece and the second glass piece is provided with a through hole. The above-mentioned glass fusing method can also be used for fusing the glass piece provided with a through hole. For example, at least one of the first glass piece and the second glass piece is a bottle neck.

[0077] In some embodiments, the first glass piece and the second glass piece have different shapes. The above-mentioned fusing method can also be used for fusing the glass pieces with different shapes, and provides a fusing method for glass pieces with different shapes.

[0078] Referring to FIG. 2, the first glass piece 10 has a fusing surface A, and the second glass piece 20 has a fusing surface B. The first glass piece 10 is, for example, a bottle neck structure. The second glass piece 20 is, for example, a flat piece structure. The above-mentioned method can be used to fuse the first glass piece 10 and the second glass piece 20 with different shapes.

[0079] It can be understood that FIG. 2 only shows a specific shape of the glass piece, but is not limited thereto. The shape of the glass piece can also be other common shapes, which are not particularly limited herein.

[0080] It can be understood that in other embodiments, the first glass piece and the second glass piece can also have the same shape.

[0081] In a second aspect, the present application provides a composite glass prepared by the above-mentioned glass fusing method.

[0082] The above-mentioned composite glass has high fusing strength at the fusing position, no cracks are generated, and the problems of bubbles and rainbow stripes are improved.

[0083] In order to make the objects and advantages of the present application more clear, the following further describes the glass fusing method and its effects in accordance with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and should not be used to limit the present application. The following embodiments do not include other components except for unavoidable impurities, unless otherwise specified. In the embodiments, the drugs and instruments are selected according to the conventional selection in the art, unless otherwise specified. The experimental methods in the embodiments are implemented according to the conventional conditions, for example, the conditions described in the literature, books or the methods recommended by the manufacturers.

[0084] The glass and glass powder to be fused used in the following examples and comparative examples are as follows: the strain point of the first glass piece is 500°C, the Tg point is 550°C, and the expansion coefficient is 7.3x10-6 / °C. The strain point of the second glass piece is 590°C, and the expansion coefficient is 7.7x10-6 / °C. The softening point of the glass powder is 540°C, and the expansion coefficient is 7.5x10-6 / °C. The solvent used for the glass powder slurry is a water-soluble ink thinner.

[0085] Example 1

[0086] The present example provides a glass fusing method, comprising the following steps:

[0087] (1) polishing the surfaces of the first and second glass pieces to be fused to a surface roughness Sa≤1 nm.

[0088] (2) screen printing a paste containing glass powder on the surfaces of the first and second glass pieces to be fused to form a fusing layer, the fusing layer having a thickness of about 15 μm.

[0089] (3) after the first and second glass pieces are bonded, heating in a muffle furnace, the fusing surface pressure being 0.02 MPa, the heating temperature curve being: heating at a rate of 5 ℃ / min to 350 ℃, holding at 350 ℃ for 20 min to remove the glue, then heating at a rate of 5 ℃ / min to 590 ℃, holding at 590 ℃ for 30 min to fuse. Then cooling at a rate of 5 ℃ / min to 400 ℃, and finally cooling with the furnace.

[0090] Example 2

[0091] The present example provides a glass fusing method, comprising the following steps:

[0092] (1) polishing the surfaces of the first and second glass pieces to be fused to a surface roughness Sa=1 nm.

[0093] (2) screen printing a paste containing glass powder on the surfaces of the first and second glass pieces to be fused to form a fusing layer, the fusing layer having a thickness of about 15 μm.

[0094] (3) after the first and second glass pieces are bonded, heating in a muffle furnace, the fusing surface pressure being 0.02 MPa, the heating temperature curve being: heating at a rate of 5 ℃ / min to 350 ℃, holding at 350 ℃ for 20 min to remove the glue, then heating at a rate of 3 ℃ / min to a fusing temperature of 580 ℃, holding for 20 min to fuse. Then cooling at a rate of 0.5 ℃ / min to 400 ℃, and finally cooling with the furnace.

[0095] Example 3

[0096] The present example provides a glass fusing method, comprising the following steps:

[0097] (1) polishing the surfaces of the first and second glass pieces to be fused to a surface roughness Sa=1 μm.

[0098] (2) screen printing a slurry containing glass powder on the fusion surface of the first glass piece and the second glass piece to form a fusion layer, and the thickness of the fusion layer is about 15 μm.

[0099] (3) after the first glass piece and the second glass piece are attached, heating is performed in a muffle furnace, the fusion surface pressure is 0.02 MPa, and the heating temperature curve of the glass piece is: heating to 350℃ at a heating rate of 5 / min, holding at 350℃ for 20 min to perform degassing, then heating to a fusion temperature of 580℃ at a heating rate of 3℃ / min, holding for 20 min. Then, cooling to 400℃ at a cooling rate of 0.5℃ / min, and finally cooling with the furnace.

[0100] Example 4

[0101] The present embodiment provides a glass fusion method, which is similar to the glass fusion method of Example 1, and the difference lies in that the fusion temperature is different, and the fusion temperature of the present embodiment is 540℃. The glass fusion method of the present embodiment comprises the following steps:

[0102] (1) grinding and polishing the to-be-fused surfaces of the first glass piece and the second glass piece to make the surface roughness Sa of the to-be-fused surfaces ≤1 nm.

[0103] (2) screen printing a slurry containing glass powder on the fusion surface of the first glass piece and the second glass piece to form a fusion layer, and the thickness of the fusion layer is about 15 μm.

[0104] (3) after the first glass piece and the second glass piece are attached, heating is performed in a muffle furnace, the fusion surface pressure is 0.02 MPa, and the heating temperature curve of the glass piece is: heating to 350℃ at a heating rate of 5℃ / min, holding at 350℃ for 20 min to perform degassing, then heating to a fusion temperature of 540℃ at a heating rate of 5 / min, holding at 540℃ for 30 min to perform fusion. Then, cooling to 400℃ at a cooling rate of 5℃ / min, and finally cooling with the furnace.

[0105] Example 5

[0106] The present embodiment provides a glass fusion method, which is similar to the glass fusion method of Example 1, and the difference lies in that no pressure is added during the fusion process. The glass fusion method of the present embodiment comprises the following steps:

[0107] (1) grinding and polishing the to-be-fused surfaces of the first glass piece and the second glass piece to make the surface roughness Sa of the to-be-fused surfaces ≤1 nm.

[0108] (2) screen printing a slurry containing glass powder on the fusion surface of the first glass piece and the second glass piece to form a fusion layer, and the thickness of the fusion layer is about 15 μm.

[0109] (3) After the first glass piece and the second glass piece are attached, heating is performed in a muffle furnace, and the heating temperature curve is as follows: the temperature is raised to 350°C at a rate of 5°C / min, the temperature is kept at 350°C for 20 min to remove the glue, and then the temperature is raised to 580°C at a rate of 5°C / min, and the temperature is kept at 580°C for 30 min to perform fusion. Then the temperature is lowered to 400°C at a rate of 5°C / min, and finally the temperature is lowered with the furnace.

[0110] Comparative Example 1

[0111] Comparative Example 1 provides a glass fusion method, comprising the following steps:

[0112] (1) The surfaces to be fused of the first glass piece and the second glass piece are polished to have a surface roughness Sa = 1 μm.

[0113] (2) A paste containing glass powder is screen printed on the fusion surfaces of the first glass piece and the second glass piece to form a fusion layer, and the thickness of the fusion layer is about 15 μm.

[0114] (3) After the first glass piece and the second glass piece are attached, heating is performed in a muffle furnace, and the fusion surface pressure is 0.02 MPa. The heating temperature curve of the glass piece is as follows: the temperature is raised to 350°C at a rate of 5°C / min, the temperature is kept at 350°C for 20 min to remove the glue, and then the temperature is raised to 620°C at a rate of 3°C / min, and the temperature is kept at 620°C for 20 min. Then the temperature is lowered to 400°C at a rate of 0.5°C / min, and finally the temperature is lowered with the furnace.

[0115] After the first glass piece and the second glass piece are fused, a universal material testing machine is used to test the fusion bonding strength, and the results are shown in Table 1. The fusion surfaces are observed by a microscope to observe the problems of bubbles and rainbow stripes, and the results are shown in Table 2.

[0116] Table 1 Fusion strength of glass after fusion of each example and comparative example

[0117] Table 2 Appearance of fusion surface of glass after fusion of each example and comparative example

[0118] As can be seen from the above tables, the glass fusion method of the examples significantly improves the fusion strength compared with Comparative Example 1, no cracks are generated, and the problems of bubbles and rainbow stripes are improved. By applying pressure while heating the first glass piece and the second glass piece, the two glass pieces are better compounded together, and the problems of bubbles and rainbow stripes are further improved. By optimizing the fusion temperature and the roughness of the fusion surface, the fusion strength can be further improved, and the problems of bubbles and rainbow stripes can be further improved.

[0119] Any technical features in the above-described embodiments can be combined, and for the sake of brevity, not all possible combinations of the technical features are described, however, any combination of the technical features should be considered as within the scope of the present disclosure.

[0120] The above-described embodiments only express several implementation manners of the present application, facilitate specific and detailed understanding of the technical solutions of the present application, but should not be understood as a limitation on the patent protection scope of the present application. It should be pointed out that, for ordinary skilled persons in the art, a number of modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. It should be understood that, on the basis of the technical solutions provided by the present application, technical solutions obtained by logical analysis, reasoning or limited experiments by those skilled in the art all belong to the protection scope of the appended claims of the present application. Therefore, the patent protection scope of the present application should be subject to the contents of the appended claims, and the description and drawings can be used to explain the contents of the claims.

Claims

1. A method of glass fusion, wherein, The glass fusing method comprises the following steps: forming a fusing layer between the first glass piece and the second glass piece, the material of the fusing layer comprising glass powder, the expansion coefficient of the glass powder being between the expansion coefficients of the first glass piece and the second glass piece; heating the first glass piece and the second glass piece at a preset temperature to soften the glass powder and fuse the first glass piece and the second glass piece, the preset temperature being above the strain point of the first glass piece and below the strain point of the second glass piece.

2. The glass fusing method according to claim 1, wherein, The preset temperature is above the glass transition temperature of the first glass piece and below the strain point of the second glass piece.

3. The glass frit method according to any one of claims 1 to 2, wherein, The preset temperature is 30-50°C higher than the softening point of the glass powder.

4. The glass frit method according to any one of claims 1 to 2, wherein, The preset temperature is 550-650°C.

5. The glass frit method according to any one of claims 1 to 4, wherein, The step of heating the first glass piece and the second glass piece at a preset temperature comprises: ramping up to the preset temperature at a ramping rate of 3-5°C / min, holding for 20-30 min, and then ramping down to below the strain point of the first glass piece at a ramping rate of 0.5-5°C / min.

6. The glass frit method according to any one of claims 1 to 5, wherein The roughness of the side surface of the first glass piece and the second glass piece facing the fusing layer is less than or equal to 1 nm.

7. The glass frit method according to any one of claims 1 to 6, wherein The first glass piece and the second glass piece are heated while a pressure of 0.02-0.04 MPa is applied.

8. The glass frit method according to any one of claims 1 to 7, wherein, The thickness of the fusing layer is 10-20 μm.

9. The glass frit method according to any one of claims 1 to 8, wherein, The material of the fusing layer further comprises a solvent, and before the step of heating the first glass piece and the second glass piece at a preset temperature, the method further comprises a step of degassing the solvent; Optionally, the step of degassing the solvent comprises holding at 350-400°C for 15-25 min.

10. The glass frit method of claim 9, wherein, The solvent comprises one or more of water-soluble ink oil, white water and terpineol.

11. The glass frit method according to any one of claims 1 to 10, wherein, The first glass piece and the second glass piece have different shapes.

12. The glass frit method according to any one of claims 1 to 11, wherein, The step of forming a fusing layer between the first glass piece and the second glass piece comprises: applying a slurry containing glass powder to the surface of at least one of the first glass piece and the second glass piece to be fused; bonding the first glass piece and the second glass piece to form a fusing layer therebetween.

13. The glass frit method of claim 12, wherein, The slurry containing glass powder is applied to the surface of at least one of the first glass piece and the second glass piece to be fused by screen printing.

14. The glass fusing method according to claim 13, wherein, The screen printing screen has a mesh size of 300-450 mesh.

15. The glass fusing method according to claim 12, wherein, After the step of applying the slurry containing glass powder to the surface of at least one of the first glass piece and the second glass piece to be fused, the method further comprises drying at 100°C for 10 min.

16. A composite glass, wherein, The composite glass is prepared by the glass fusing method according to any one of claims 1-15.

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