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Method for producing chemically toughened glass

A technology of strengthening glass and manufacturing method, which is applied in the field of chemically strengthening glass, can solve the problems of glass strength reduction, chemical strengthening temperature conditions, time constraints, etc., and achieve the effect of improving surface strength, high surface strength, and simple temperature conditions

Active Publication Date: 2019-05-24
ASAHI GLASS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] However, for the method described in Patent Document 1, for the purpose of increasing the depth of the compressive stress layer (defined as the depth at which the compressive stress value becomes zero, hereinafter also abbreviated as DOC (Depth of Compression)) to obtain high strength Chemical strengthening at high temperature for a long time has the following problems: as a side effect, the strength of glass decreases, and the temperature conditions and time of chemical strengthening are limited

Method used

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  • Method for producing chemically toughened glass
  • Method for producing chemically toughened glass
  • Method for producing chemically toughened glass

Examples

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Embodiment

[0116] Hereinafter, although an Example and a comparative example are given and this invention is demonstrated concretely, this invention is not limited to these Examples and a comparative example.

[0117] [Production of chemically strengthened glass]

[0118] After performing the chemical strengthening process under the conditions shown below, an acid treatment process, an alkali treatment process, and a grinding process were sequentially performed, and chemically strengthened glass was produced. In addition, about each Example and a comparative example, the presence or absence of each process is shown in Tables 1 and 2.

[0119] (chemical strengthening process)

[0120] The material of the inorganic salt was added to a SUS cup so that the composition and pH shown in Tables 1 and 2 were obtained, and the molten salt was prepared by heating with a mantle heater to the temperature shown in Tables 1 and 2. Prepare aluminosilicate glasses A to C with a plan view of 50 mm x 50 ...

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Abstract

The present invention provides a method for producing a chemically toughened glass having a deep depth of compression (DOC) and a high surface strength without decreasing the strength of the glass even if the glass has been subjected to a chemical toughening treatment at a high temperature for a long period of time. The present invention relates to a method for producing a chemically toughened glass, which comprises a chemical toughening step wherein a glass is brought into contact with an inorganic salt for ion exchange, said inorganic salt containing at least one of sodium nitrate and potassium nitrate and having a hydrogen ion index (pH) of from 7.5 to 10.5 (inclusive) when formed into a 10% by mass aqueous solution; and an acid treatment step wherein the glass after the chemical toughening step is brought into contact with an acidic solution for an acid treatment, said acidic solution having a hydrogen ion index (pH) of less than 7.0.

Description

technical field [0001] The present invention relates to a method for manufacturing chemically strengthened glass. Background technique [0002] In flat-panel display devices such as digital cameras, mobile phones, and PDAs (Personal Digital Assistants), in order to protect the display and improve appearance, a thin-plate-shaped cover glass is placed on the display so that it becomes an area larger than the image display portion. front surface. Although glass has high theoretical strength, its strength will be greatly reduced by damage. Therefore, for cover glass that requires strength, chemically strengthened glass that forms a compressive stress layer on the glass surface by ion exchange or the like is used. [0003] Along with the demand for weight reduction and thinning of flat panel display devices, the cover glass itself needs to be thinned. Therefore, for the cover glass, further strength is required on the surface in order to satisfy this purpose. [0004] As one o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C21/00C03C15/00
CPCC03C15/00C03C21/00C03C21/002
Inventor 鹿岛出藤原祐辅世良洋一
Owner ASAHI GLASS CO LTD
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