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Chemically strengthened glass

A technology for strengthening glass and glass, which is applied in the field of chemically strengthening glass, and can solve problems such as strength reduction

Active Publication Date: 2015-07-29
ASAHI GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Here, regarding the strength of glass, it is known that the strength of glass decreases due to the presence of hydrogen (moisture) in glass (Non-Patent Documents 1 and 2)

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0155] (Process 1a-Preparation of Potassium Nitrate Molten Salt-)

[0156] In step 1a, potassium nitrate is charged into a container, and heated to a temperature higher than the melting point to melt it to prepare a molten salt. Melting is performed at a temperature within the range of the melting point (330° C.) and boiling point (500° C.) of potassium nitrate. In particular, setting the melting temperature to 350 to 470° C. is preferable from the viewpoint of providing a balance between the surface compressive stress (CS) and compressive stress layer depth (DOL) of the glass and the strengthening time.

[0157] Metal, quartz, ceramics, etc. can be used for the container of molten potassium nitrate. Among these, metal materials are preferable from the viewpoint of durability, and stainless steel (SUS) materials are preferable from the viewpoint of corrosion resistance.

[0158] (Procedure 2a-addition of flux to potassium nitrate molten salt-)

[0159] In step 2a, the above...

Embodiment 1

[0246] (chemical strengthening process)

[0247] 9,700 g of potassium nitrate, 890 g of potassium carbonate, and 400 g of sodium nitrate were added to a SUS cup, and heated to 450° C. with a mantle heater to prepare a molten salt of 6 mol % of potassium carbonate and 10,000 ppm by weight of sodium. Prepare aluminosilicate glass A (specific gravity 2.48) of 50mm×50mm×0.56mm, preheat to 200-400°C, then immerse in molten salt at 450°C for 2 hours, perform ion exchange treatment, and cool to around room temperature, Thereby, chemical strengthening treatment is performed. The obtained chemically strengthened glass is washed with water, and supplied to the subsequent process.

[0248] Composition of aluminosilicate glass A (in mol%): SiO 2 64.4%, Al 2 o 3 8.0%, Na 2 O12.5%, K 2 O 4.0%, MgO 10.5%, CaO 0.1%, SrO 0.1%, BaO 0.1%, ZrO 2 0.5%

[0249] (acid treatment process)

[0250] 13.4% by weight of hydrochloric acid (HCl: manufactured by Kanto Chemical Co., Ltd.) was prepar...

Embodiment 2

[0255] Use aluminosilicate glass A with the plate thickness shown in Table 1; set the molten salt temperature and ion exchange treatment time to 430°C and 40 minutes respectively, and spray the adjusted hydrochloric acid aqueous solution and hydrogen with a glass advection cleaning machine The sodium oxide aqueous solution was each for 277 seconds to perform acid treatment and alkali treatment. Except for this, chemically strengthened glass was produced in the same manner as in Example 1.

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Abstract

Provided is a chemically strengthened glass comprising a compressive stress layer that is formed on a surface layer of the chemically strengthened glass using an ion exchange method. The surface roughness (Ra) is 0.20 nm or more. The hydrogen concentration (Y) in an area that is at a depth (X) from the outermost surface of the glass satisfies the relational expression (I) when X = 0.1-0.4 (µm). The surface strength (F) (in N) as measured using a ball-on-ring test with respect to the plate thickness (t) (in mm) of a glass plate of the chemically strengthened glass satisfies F ≥ 1500 × t2. The chemically strengthened glass has no polishing flaws on the surface thereof. Relational expression (I): Y = aX + b. The meaning of each of the symbols in relational expression (I) is as follows: Y is hydrogen concentration (H2O conversion, mol / L); X is the depth (µm) from the outermost surface of the glass; a is 0.270 to -0.005; and b is 0.020 to 0.220.

Description

technical field [0001] This invention relates to chemically strengthened glass. Background technique [0002] In flat panel display devices such as digital cameras, mobile phones, and PDAs (Personal Digital Assistants), a thin plate-shaped protective glass is arranged on the front of the display so that the area is wider than the image display part in order to protect the display and improve the appearance. Although the theoretical strength of glass is high, its strength is greatly reduced due to damage. Therefore, chemically strengthened glass in which a compressive stress layer is formed on the glass surface by ion exchange or the like is used as the glass required for strength. [0003] Along with the demand for weight reduction and thinning of flat panel display devices, the protective glass itself is also required to be thinner. Therefore, in order to satisfy this purpose, the cover glass is required to have higher strength on both the surface and end faces. [0004] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C21/00C03C23/00
CPCC03C23/00C03C21/00
Inventor 鹿岛出藤原祐辅玉井喜芳铃木祐一小林大介世良洋一山田拓
Owner ASAHI GLASS CO LTD
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