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Glass strengthening process capable of reducing warping and dimensional expansion

A glass strengthening and sizing technology, which is applied in glass production and other directions, can solve problems such as expansion, glass warping size, and difficult control, and achieve the effect of convenient operation and control, simple steps, and reducing glass warping

Active Publication Date: 2020-03-31
湖南晶博光电有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] During low-temperature ion exchange, the compressive stress on the glass surface first increases and then decreases with the increase of the compression depth of the stress layer, which is difficult to control, and the glass will warp and expand in size during strengthening, which will affect the use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A glass strengthening process that reduces warpage and dimensional expansion, including primary and secondary strengthening:

[0042] (1) The first strengthening: put the glass into molten salt containing low concentration of potassium nitrate, and strengthen it at 375°C for 11 hours;

[0043] (2) The second strengthening: put the first strengthened glass into molten salt containing high concentration of potassium nitrate, and strengthen it at 405°C for 2.5h.

[0044] In described step (1), the mass percent of sodium nitrate and potassium nitrate in the molten salt containing low concentration potassium nitrate is 50%: 50%; In described step (2), contain the molten salt sodium nitrate of high concentration potassium nitrate And the mass percentage of potassium nitrate is 0:100%.

[0045] In the step (1), the glass is aluminosilicate glass, and by weight percentage, the aluminosilicate glass comprises the following components: SiO 2 : 58%, Al 2 o 3 : 16%, Na 2 O: 15...

Embodiment 2

[0047] A glass strengthening process that reduces warpage and dimensional expansion, including primary and secondary strengthening:

[0048] (1) The first strengthening: put the glass into molten salt containing low concentration of potassium nitrate, and strengthen it at 380°C for 10 hours;

[0049] (2) The second strengthening: put the first strengthened glass into molten salt containing high concentration of potassium nitrate, and strengthen it at 410°C for 2 hours.

[0050] In described step (1), the mass percent of sodium nitrate and potassium nitrate in the molten salt containing low concentration potassium nitrate is 65%: 35%; In described step (2), contain the molten salt sodium nitrate of high concentration potassium nitrate And the mass percent of potassium nitrate is 5%: 95%.

[0051] In the step (1), the glass is aluminosilicate glass, and by weight percentage, the aluminosilicate glass comprises the following components: SiO 2 : 60%, Al 2 o 3 : 15%, Na 2 O: 1...

Embodiment 3

[0053] A glass strengthening process that reduces warpage and dimensional expansion, including primary and secondary strengthening:

[0054] (1) The first strengthening: put the glass into molten salt containing low concentration of potassium nitrate, and strengthen it at 385°C for 9 hours;

[0055] (2) The second strengthening: put the first strengthened glass into molten salt containing high concentration of potassium nitrate, and strengthen it at 415°C for 1.5h;

[0056] In described step (1), the mass percent of sodium nitrate and potassium nitrate in the molten salt containing low concentration potassium nitrate is 80%: 20%; In described step (2), contain the molten salt sodium nitrate of high concentration potassium nitrate And the mass percentage of potassium nitrate is 10%: 90%.

[0057] In the step (1), the glass is aluminosilicate glass, and by weight percentage, the aluminosilicate glass comprises the following components: SiO 2 : 62%, Al 2 o 3 : 14%, Na 2 O: 1...

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Abstract

The invention relates to the technical field of glass strengthening, in particular to a glass strengthening process capable of reducing warping and dimensional expansion. The glass strengthening process comprises the following steps: (1) primary strengthening: putting glass into molten salt containing low-concentration potassium nitrate, and carrying out strengthening at a temperature of 375 to 385 DEG C for 9 to 11 hours; and (2) secondary strengthening: putting the glass having undergone primary strengthening into molten salt containing high-concentration potassium nitrate, and carrying outstrengthening at a temperature of 405-415 DEG C for 1.5-2.5 hours. The strengthening process disclosed by the invention adopts a two-step method; in the first step, proper stress layer compression depth is obtained through slow strengthening in the molten salt containing low-concentration potassium nitrate; in the second step, proper glass surface pressure stress is obtained through rapid strengthening in the molten salt containing high-concentration potassium nitrate; so glass warping can be reduced, dimensional expansion during glass strengthening is avoided, the steps are simple, and operation and control are convenient.

Description

technical field [0001] The invention relates to the technical field of glass strengthening, in particular to a glass strengthening process capable of reducing warpage and size expansion. Background technique [0002] In recent years, devices such as smartphones and tablet computers have become more and more popular, and they are showing a trend of thinning and lightweighting. One problem with thinning is that the strength of the glass decreases as the thickness decreases. In order to meet the requirements of use, the display glass must still have high strength at a small thickness. To achieve this, the glass needs to be strengthened. [0003] At present, in the composition of the aluminosilicate glass used, in order to ensure the ion exchange capacity and take into account factors such as glass meltability, formability, and devitrification resistance, the content of alkali metal oxides is relatively high. When strengthening aluminosilicate glass, because the glass is thin...

Claims

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Application Information

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IPC IPC(8): C03C21/00
CPCC03C21/002Y02P40/57
Inventor 徐期文
Owner 湖南晶博光电有限公司
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