WO2016185880A1 - Chemically strengthened glass, glass article to be chemically strengthened, and chemically strengthened glass production method and cleaving method - Google Patents

Abstract

This plate-shaped chemically strengthened glass (11) has an end portion (12) that, when a cleavage line is to be formed, serves as a starting part for forming the cleavage line. The end portion (12) of the chemically strengthened glass (11) is provided with an end face (12a) of which the surface stress value is less than or equal to 100 MPa. This glass article (15) to be chemically strengthened has a structure in which a coating layer (18) for inhibiting chemical strengthening is laminated on at least a part of an end face (17) of plate-shaped glass (16) to be chemically strengthened. This production method for chemically strengthened glass (11) comprises, for example, a step for laminating a coating layer (18) on at least a part of an end face of the glass (16) to be chemically strengthened and a step for chemically strengthening the glass (16) to be chemically strengthened, on which the coating layer (18) is laminated. This method of cleaving chemically strengthened glass (11) comprises a step for forming a cleavage line from an end portion (12) on the chemically strengthened glass (11) and a step for cleaving the chemically strengthened glass (11) along the cleavage line.

Description

Chemically tempered glass, glass article for chemical tempering, and method for producing and cleaving chemically tempered glass

The present invention relates to a chemically strengthened glass, a glass article for chemical strengthening, and a method for producing and cleaving chemically strengthened glass.

For example, for a display cover glass or the like, a divided body obtained by cleaving chemically strengthened glass into a predetermined dimension may be used. When chemically tempered glass is cleaved to a predetermined size, a cleave line is formed in the chemically tempered glass, and then cleaved along the cleave line (see, for example, Patent Document 1).

JP 2008-007384 A

Since the end of the chemically strengthened glass is composed of a compressive stress layer, when forming a breaking line so as to penetrate the compressive stress layer from the end of the chemically strengthened glass, the end of the chemically strengthened glass is relatively A strong impact will be applied. In addition, when a breaking line is formed from the edge of chemically strengthened glass, if a relatively large tensile stress remains inside the edge of chemically strengthened glass, the breaking line is assumed due to the action of the tensile stress. Easy to progress in the outward direction. In addition, when the conditions for forming the breaking line are relaxed so that the breaking line is formed in the expected direction with respect to chemically strengthened glass, the breaking line is difficult to progress even if it is attempted to break along the breaking line. Cleaving of tempered glass itself becomes difficult.

The present invention has been made in view of such circumstances, and its purpose is to provide a chemically strengthened glass, a glass article for chemical strengthening, and a chemically strengthened glass that can be suitably used for applications that are split along a breaking line. It is in providing the manufacturing method and cleaving method.

In one aspect of the present invention, in order to solve the above-mentioned problem, a plate-shaped chemically strengthened glass used for a purpose of being cut along a breaking line, wherein the breaking line is formed when the breaking line is formed in the chemically strengthened glass. A chemically tempered glass is provided that has an end portion that becomes a line formation start portion, and the end portion has an end surface with a surface stress value of 100 MPa or less.

According to this configuration, when the compressive stress value as the surface stress value of the end face is 100 MPa or less, it is possible to relax the conditions for forming the breaking line. Thereby, when forming the breaking line from the edge part of chemically strengthened glass, it becomes possible to relieve the impact added to an edge part.

Further, when the compressive stress value as the surface stress value of the end face is 100 MPa or less, the tensile stress remaining inside the end portion of the chemically strengthened glass becomes small. Thereby, the breaking line formed from the edge part of chemically strengthened glass becomes difficult to advance in an unexpected direction. In addition, even if it is a case where the said edge part is comprised from a tensile-stress layer and is provided with an end surface whose tensile-stress value is 100 Mpa or less, the same effect | action is acquired.

In the chemically strengthened glass, the compressive stress value of the main surface of the chemically strengthened glass is preferably 500 MPa or more.
According to this configuration, the mechanical strength of the main surface of the chemically strengthened glass is more easily ensured.

In another aspect of the present invention to solve the above problems, there is provided a glass article for chemical strengthening, in which a coating layer for suppressing chemical strengthening is laminated on at least a part of the end face of the plate-shaped chemically strengthened glass. The

According to this structure, the chemical strengthening of the end surface of the glass for chemical strengthening is suppressed by the coating layer.
The method for producing the chemically strengthened glass includes a step of laminating a coating layer for suppressing chemical strengthening on at least a part of an end face of the plate-shaped chemically strengthened glass, and a chemical strengthening glass laminated with the coating layer. And a step of strengthening.

According to this method, the chemically strengthened glass can be easily produced.
It is preferable that the manufacturing method of the said chemically strengthened glass is equipped with the process of grind | polishing or etching at least one part of the end surface of the chemically strengthened glass by which the outer surface including an end surface was chemically strengthened.

According to this method, the end face of the chemically strengthened glass can be easily formed.
The method for cleaving the chemically strengthened glass includes a step of forming a breaking line from the end portion and a step of cleaving the chemically strengthened glass along the breaking line.

According to this method, the end face of the chemically strengthened glass can be easily formed.

According to the present invention, it can be suitably used for applications that are cleaved. Other aspects and advantages of the present invention will become apparent from the following description taken in conjunction with the drawings which illustrate examples of the technical idea of the present invention.

(A) And (b) is explanatory drawing explaining the manufacturing method and cleaving method of chemically strengthened glass, the glass article for chemical strengthening, and chemically strengthened glass in 1st Embodiment. (A), (b) and (c) is explanatory drawing explaining the manufacturing method and cleaving method of chemically strengthened glass in 2nd Embodiment, and chemically strengthened glass.

(First embodiment)
Hereinafter, a first embodiment of a chemically tempered glass, a glass article for chemical strengthening, and a method for producing and cleaving a chemically strengthened glass will be described with reference to FIGS. 1 (a) and 1 (b). Note that in the drawings, some of the components may be exaggerated for convenience of explanation. Further, the dimensional ratio of each part may be different from the actual one.

The plate-like chemically strengthened glass 11 shown in FIG. 1 (a) is used for applications that are cleaved along a cleaving line. The chemically tempered glass 11 has an end portion 12 that becomes a formation start portion of the breaking line when the breaking line is formed. The end portion 12 of the chemically strengthened glass 11 includes an end surface 12a having a surface stress value of 100 MPa or less. The surface stress remaining in the chemically strengthened glass 11 is a compressive stress or a tensile stress, and the surface stress value is preferably as close to “0” as possible. The surface stress value of the chemically strengthened glass 11 can be measured using a commercially available surface stress measuring device.

In the example shown in FIG. 1A, the end face 12a composed of the non-compressive stress layer 11a (tensile stress layer) is schematically shown. If the surface stress value is 100 MPa or less, the compressive stress layer The end surface 12a comprised from may be sufficient.

The first main surface 13 of the chemically strengthened glass 11 and the second main surface 14 opposite to the first main surface 13 are constituted by a compressive stress layer 11b. The compressive stress value of the main surfaces (the first main surface 13 and the second main surface 14) of the chemically strengthened glass 11 is preferably 500 MPa or more from the viewpoint of further ensuring the mechanical strength of the chemically strengthened glass 11. In addition, the compressive stress value of the main surface (the 1st main surface 13 and the 2nd main surface 14) of the chemically strengthened glass 11 is 1500 Mpa or less, for example.

Next, the glass article for chemical strengthening will be described.
As shown in FIG.1 (b), the glass article 15 for chemical strengthening laminated | stacked the coating layer 18 which suppresses chemical strengthening on the end surface 17 of the plate-shaped chemical strengthening glass 16 in which chemical strengthening is possible. is there. The end surface 17 on which the coating layer 18 is laminated constitutes the end portion 12 that becomes the formation start portion of the breaking line described above.

The chemical strengthening glass 16 is, for example, in terms of mass%, SiO ₂ : 50 to 80%, Al ₂ O ₃ : 5 to 25%, B ₂ O ₃ : 0 to 15%, Na ₂ O: 1 to 20%, K ₂ O: 0 to 10% is contained. Although the thickness of the glass 16 for chemical strengthening is not specifically limited, For example, it is the range of 0.3 mm or more and 2.5 mm or less.

The material constituting the coating layer 18 is a material that can suppress the exchange of alkali ions in the end face 17 of the chemically strengthening glass 16, and is preferably a material that is more brittle than the compressive stress layer. As these, a metal and a metal oxide are mentioned. Examples of the metal include gold and silver. Examples of the metal oxide include silicon oxide, aluminum oxide, silicon nitride, aluminum nitride, zirconia, titanium oxide, silicon carbide, tantalum pentoxide, niobium pentoxide, hafnium oxide, and tin oxide. For example, a resin material such as bakelite may be used as the coating layer 18.

The thickness of the coating layer 18 is set to a thickness that can suppress the exchange of alkali ions in the chemically strengthening glass 16. The thickness of the coating layer 18 is set to, for example, 10 nm or more from the viewpoint of further suppressing the exchange of alkali ions in the chemically strengthening glass 16. Such a coating layer 18 can also be configured to completely inhibit chemical strengthening (exchange of alkali ions).

Next, the manufacturing method of the chemically strengthened glass 11 is demonstrated.
The manufacturing method of the chemically strengthened glass 11 includes a stacking process in which a coating layer 18 that suppresses chemical strengthening is stacked on at least a part of the end face 17 of the chemically strengthened glass 16, and a chemically strengthened glass 16 in which the coating layer 18 is stacked. A chemical strengthening step of chemically strengthening (the glass article 15 for chemical strengthening).

As a method for forming the coating layer, for example, a well-known film forming method such as sputtering, vapor deposition, dipping, or coating can be used.
In the chemical strengthening step, a well-known method of ion exchange between alkali ions (for example, sodium ions) in the chemically strengthening glass 16 and ions having a larger ion radius than the alkali ions (for example, potassium ions, silver ions) is performed. Can be used. For example, a method of immersing the chemical strengthening glass 16 containing sodium ions in a chemical strengthening solution such as a potassium nitrate solution can be used.

Next, a method for cleaving the chemically strengthened glass 11 will be described.
As shown in FIG. 1 (a), the method of cleaving the chemically strengthened glass 11 includes a cleaving line forming step of forming a cleaving line from the end 12 of the chemically tempered glass 11, and cleaving the chemically strengthened glass 11 along the cleaving line. And a cleaving process. The breaking line is a so-called scribe line, penetrates the compressive stress layer 11b constituting the main surface (first main surface 13) on one side in the thickness direction, and forms an incompressible stress layer 11a (inside the compressive stress layer 11b). It is formed to have a depth that enters the tensile stress layer. That is, the breaking line is formed so as to open to the first main surface 13 constituting the end portion 12 and the end surface 12a that also constitutes the end portion 12 and has a surface stress value of 100 MPa or less. In the present embodiment, an example in which a breaking line is formed using a wheel cutter C is shown.

The cleaving step is a step of applying, for example, bending stress, impact force, or thermal stress to the chemically strengthened glass 11 so that the chemically strengthened glass 11 is folded along the breaking line. In addition, the cleaving method of the chemically strengthened glass 11 may include a pre-process performed before the cleaving line forming process or the cleaving process. Examples of the pre-process include a step of laminating a functional layer on the chemically strengthened glass 11 and a step of forming holes or the like in the chemically strengthened glass 11. Examples of the functional layer include a sensor circuit, a conductive layer, and a printed layer for decoration and identification purposes.

By splitting the chemically strengthened glass 11 by the above-described method for splitting the chemically strengthened glass 11, a divided body of the chemically strengthened glass 11 is obtained. Examples of the use of the chemically strengthened glass 11 (divided body of the chemically strengthened glass 11) include display use, touch panel use, photoelectric conversion panel use, electronic device use, window glass use, building material use, and vehicle use.

Next, main actions of the chemically strengthened glass 11 will be described.
The chemically tempered glass 11 has an end portion 12 that becomes a formation start portion of the breaking line when the breaking line is formed. The end portion 12 of the chemically strengthened glass 11 includes an end surface 12a having a surface stress value of 100 MPa or less.

According to this configuration, when the compressive stress value as the surface stress value of the end face 12a is 100 MPa or less, it is possible to relax the conditions for forming the breaking line. Thereby, when forming the breaking line from the end portion 12 of the chemically strengthened glass 11, it is possible to reduce the impact applied to the end portion 12.

Further, when the compressive stress value as the surface stress value of the end face 12a is 100 MPa or less, the tensile stress remaining in the end portion 12 of the chemically strengthened glass 11 becomes small. Thereby, the breaking line formed from the edge part 12 of the chemically strengthened glass 11 becomes difficult to advance in an unexpected direction. In addition, the said edge part 12 is a case where it is a case where it is comprised from the tensile-stress layer and is provided with the end surface 12a whose tensile stress value is 100 Mpa or less, The same effect | action is acquired.

According to 1st Embodiment explained in full detail above, the following effects are exhibited.
(1) The plate-shaped chemically strengthened glass 11 is used for applications that are cleaved along a cleaving line. The chemically tempered glass 11 has an end portion 12 that becomes a formation start portion of the breaking line when the breaking line is formed. The end portion 12 of the chemically strengthened glass 11 includes an end surface 12a having a surface stress value of 100 MPa or less. According to this configuration, since the above-described action can be obtained, it can be suitably used for applications that are cleaved along the cleaving line. For example, even if the impact applied to the end portion of the chemically strengthened glass 11 is relaxed by relaxing the conditions for forming the breaking line in the chemically strengthened glass 11, the break line is formed in the expected direction with respect to the chemically strengthened glass 11. It is easy to cut and can be easily cut along the cutting line.

(2) The compressive stress value of the main surface of the chemically strengthened glass 11 is preferably 500 MPa or more. In this case, the mechanical strength of the main surface of the chemically strengthened glass 11 is more easily ensured.
(3) The glass article 15 for chemical strengthening has a configuration in which a coating layer 18 that suppresses chemical strengthening is laminated on at least a part of the end surface 17 of the plate-shaped chemical strengthening glass 16. According to this configuration, the chemical strengthening of the end face 17 of the chemically strengthening glass 16 is suppressed by the coating layer 18. Thereby, said chemically strengthened glass 11 can be obtained easily. Therefore, the glass article 15 for chemical strengthening can be suitably used for applications that are cleaved along the cleaving line.

(4) The manufacturing method of the chemically strengthened glass 11 includes a stacking step in which a coating layer 18 that suppresses chemical strengthening is stacked on at least a part of the end surface 17 of the plate-shaped chemically strengthening glass 16, and the coating layer 18 is stacked. And a chemical strengthening step for chemically strengthening the chemically strengthening glass 16. According to this method, the chemically strengthened glass 11 can be easily manufactured.

(5) The cleaving method for the chemically strengthened glass 11 includes a cleaving line forming step for forming a cleaving line from the end 12 of the chemically tempered glass 11 and a cleaving step for cleaving the chemically tempered glass 11 along the cleaving line. Yes. According to this method, since the effect | action of the chemically strengthened glass 11 mentioned above is exhibited, the chemical strengthened glass 11 can be cleaved easily. In addition, according to such a method, it is possible to relax the conditions for forming the breaking line. For example, general-purpose having a circular outer periphery without using a wheel cutter having a special uneven outer periphery. The wheel cutter C can be used.

(Second Embodiment)
Next, a second embodiment of the chemically strengthened glass 11, its manufacturing method and cleaving method will be described with reference to FIGS. 2 (a) to 2 (c). In the present embodiment, a description will be given focusing on differences from the first embodiment.

As shown in FIG. 2A, the chemically strengthened glass 11 of the present embodiment has a surface stress value of 100 MPa or less at the end 12 of the chemically strengthened glass 11 in the same manner as the chemically strengthened glass 11 of the first embodiment. An end face 12a is provided.

As shown in FIG. 2 (b), the chemically strengthened glass 11 of this embodiment is manufactured using an end face tempered glass 19. The end surface tempered glass 19 is chemically strengthened on the outer surface including the end surface. The method for producing the chemically strengthened glass 11 includes a polishing step for polishing at least a part of the end face of the end face strengthened glass 19.

As shown in FIG. 2C, a known method of polishing the end face of the end face tempered glass 19 using a grindstone S can be used in the polishing step. That is, the grindstone S may be a grooveless grindstone or a grooved grindstone as long as the end face of the end face tempered glass 19 can be polished. The polishing step may be performed using sand blasting.

The chemically strengthened glass 11 of this embodiment can be cleaved by the same cleaving method as that of the first embodiment. The chemically strengthened glass 11 obtained as described above can be cut more easily because the compressive stress layer 11b gradually decreases as it approaches the end face 12a.

According to this embodiment, in addition to the effects described in the columns (1), (2), (5) in the description of the first embodiment, the following functions and effects are exhibited.
(6) The method for producing the chemically strengthened glass 11 includes a step of polishing at least a part of the end face of the chemically strengthened glass (end face strengthened glass 19) whose outer surface including the end face is chemically strengthened. Also by this method, the chemically strengthened glass 11 can be easily manufactured. Moreover, according to this method, along the breaking line, using chemically strengthened glass having a compressive stress value of 500 MPa or more on the entire outer surface, that is, chemically strengthened glass (end surface strengthened glass 19) chemically strengthened according to a conventional method. The chemically strengthened glass 11 suitable for the application to be cut can be produced.

(Example of change)
You may change the said embodiment as follows.
-In 1st and 2nd embodiment, although the breaking line is formed in the chemically strengthened glass 11 using the wheel cutter C, you may form a breaking line using a laser beam.

-Although the coating layer 18 is laminated | stacked on the end surface 12a of the chemically strengthened glass 11 of 1st Embodiment, before forming a breaking line, the coating layer 18 is removed from the chemically strengthened glass 11 by methods, such as grinding | polishing, for example. May be. When the coating layer 18 is removed from the chemically strengthened glass 11, as shown in FIG. 2A, the compressive stress layer 11 b gradually decreases as it approaches the end surface 12 a, so that it can be more easily cut. In addition, by providing the chemically strengthened glass 11 laminated with the coating layer 18 to the cleaving process as in the first embodiment, the end surface 12a of the chemically strengthened glass 11 is protected by the coating layer 18 in the previous process of the cleaving process. You can also.

-In the glass article 15 for chemical strengthening in 1st Embodiment, the coating layer 18 is laminated | stacked on the end surface 17 of the glass 16 for chemical strengthening, but when this coating layer 18 is immersed in a chemical strengthening liquid, it is chemical. It can also be provided so as to be peelable from the reinforcing glass 16. In this case, the contact time between the end surface 17 of the chemically strengthening glass 16 and the chemical strengthening liquid can be made shorter than the contact time between the main surface of the chemical strengthening glass 16 and the chemical strengthening liquid. Glass 11 can be obtained. For example, by providing an easy peeling layer between the chemically strengthening glass 16 and the coating layer 18, the coating layer 18 can be configured to be peelable as described above. When comprised in this way, the chemically strengthened glass 11 from which the coating layer 18 was removed can be obtained easily.

-In 2nd Embodiment, although the end surface 12a whose surface stress value is 100 Mpa or less is formed by grind | polishing the end surface of the end surface tempered glass 19, the end surface (the compressive stress layer 11b which comprises an end surface is chemically strengthened). The end surface 12a having a surface stress value of 100 MPa or less can also be formed by dissolving a part or all of the surface by an etching step of etching. In the etching process, after masking the main surface of the end face tempered glass 19 as necessary, the end face tempered glass 19 is immersed in an etching solution, or only the end portion 12 of the end face tempered glass 19 is immersed in an etching solution. Can be done. As the etchant, for example, an aqueous solution containing hydrofluoric acid can be used.

-In the chemically strengthened glass 11 of 1st and 2nd embodiment, among the end surfaces which comprise the said edge part 12, the compressive stress layer 11b which comprises the 1st main surface 13, and the compressive stress which comprises the 2nd main surface 14 The surface stress value of the end surface 12a located between the layers 11b is set to 100 MPa or less. That is, although the surface stress value of a part of the end surface (end surface 12a) constituting the end portion 12 is set to 100 MPa or less, in the first embodiment, for example, by adjusting the conditions for chemical strengthening, It is also possible to set the surface stress value of the entire end face constituting the end portion 12 to 100 MPa or less.

In the chemically tempered glass 11 of the first and second embodiments, the configuration of the end portions other than the end portion 12 that becomes the breaking wire formation start portion when forming the breaking wire is not particularly limited. Further, in the chemically strengthened glass 11, when there are a plurality of end portions 12 that become the formation start portion of the breaking line when forming the breaking line, at least one end portion 12 has an end surface 12 a having the above surface stress value of 100 MPa or less. It becomes effective if applied. For example, when the chemically strengthened glass 11 has a quadrangular plate shape, the end portion 12 serving as a breaking line formation start portion is formed on a pair of end portions constituting a pair of adjacent sides to form a lattice-shaped breaking line. Since it is often set, it is preferable to configure such a pair of end portions so as to include an end surface 12a having a surface stress value of 100 MPa or less.

The present invention is not limited to the illustrated example. For example, the illustrated features should not be construed as essential to the invention, but rather the subject matter of the invention may be present in fewer features than all the features of the particular embodiment disclosed. The present invention is defined by the terms of the claims, and is intended to include any modifications within the scope equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 11 ... Chemically strengthened glass, 12 ... End part, 12a ... End surface, 13 ... 1st main surface, 14 ... 2nd main surface, 15 ... Glass article, 16 ... Glass for chemical strengthening, 17 ... End surface, 18 ... Covering layer, 19: End face tempered glass.

Claims (6)

It is a plate-shaped chemically strengthened glass used for applications that are cleaved along the cleaving line,
When forming the breaking line in the chemically strengthened glass, it has an end that becomes the formation start part of the breaking line,
The said edge part is equipped with the end surface whose surface stress value is 100 Mpa or less, The chemically strengthened glass characterized by the above-mentioned. The chemically tempered glass according to claim 1, wherein the compressive stress value of the main surface of the chemically tempered glass is 500 MPa or more. A glass article for chemical strengthening, characterized in that a coating layer that suppresses chemical strengthening is laminated on at least a part of the end face of the plate-shaped chemical strengthening glass. A method for producing a chemically strengthened glass according to claim 1 or 2,
Laminating a coating layer that suppresses chemical strengthening on at least a part of the end face of the plate-shaped chemically strengthening glass;
A step of chemically strengthening the chemically strengthened glass on which the coating layer is laminated, and a method for producing chemically strengthened glass. A method for producing a chemically strengthened glass according to claim 1 or 2,
A method for producing chemically strengthened glass, comprising a step of polishing or etching at least part of an end surface of chemically strengthened glass whose outer surface including the end surface is chemically strengthened. A method for cleaving a chemically strengthened glass according to claim 1 or 2,
Forming a breaking line from the end on the chemically strengthened glass;
A step of cleaving the chemically strengthened glass along the cleaving line.

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