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Molten salt for chemical strengthening of medium-aluminum and high-alumina silicate glass and method for chemical strengthening using it

A high-alumina silicate and glass technology, which is used in the field of molten salt for chemical strengthening of aluminum and high-alumina silicate glass, and chemical tempering strengthening field The effect of increasing exchange rate, avoiding corrosion, and high transmittance

Active Publication Date: 2020-01-14
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN103922576 discloses a Na-containing 2 SiO 3 , SiO 2 、Al 2 o 3 、K 2 CO 3 and Al(OH) 3 additive formula, but the types of additives used are large, the dosage is large, the tempering time is long, and the cost is high

Method used

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  • Molten salt for chemical strengthening of medium-aluminum and high-alumina silicate glass and method for chemical strengthening using it

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The above-mentioned original glass sheet is cut and edged, cleaned and placed in a preheating furnace for preheating treatment. The preheating temperature is 380°C, and the temperature is raised with the furnace and kept for half an hour, and then quickly transferred to the molten molten salt. The temperature of the molten salt is 430°C, the ion exchange time is 4 hours, after the exchange is completed, take it out to cool naturally, and use a stress tester to test the stress and stress layer depth of the glass.

[0025] Molten salt composition is 100 parts by weight KNO 3 , 0.4 parts by weight KOH, 0.3 parts by weight KCl and 1 parts by weight K 2 CO 3 . where m(KCl) / m(K 2 CO 3 )=0.3, m(KOH) / m(K 2 CO 3 )=0.4, satisfying 0.075≤m(KCl) / m(K 2 CO 3 )≤0.35, 0.075≤m(KOH) / m(K 2 CO 3 )≤0.4.

Embodiment 2

[0027] The difference between this embodiment and embodiment 1 is:

[0028] Molten salt composition is 100 parts by weight KNO 3 , 0.4 parts by weight KOH, 0.3 parts by weight KCl and 2 parts by weight K 2 CO 3 , the molten salt temperature is 430°C, and the exchange time is 4h. where m(KOH) / m(K 2 CO 3 )=0.4, m(KCl) / m(K 2 CO 3 )=0.15, m(KOH) / m(K 2 CO 3 )=0.4, satisfying 0.075≤m(KCl) / m(K 2 CO 3 )≤0.35, 0.075≤m(KOH) / m(K 2 CO 3 )≤0.4.

Embodiment 3

[0030] The difference between this embodiment and embodiment 1 is:

[0031] Molten salt composition is 100 parts by weight KNO 3 , 0.4 parts by weight KOH, 0.3 parts by weight KCl and 4 parts by weight K 2 CO 3, the molten salt temperature is 420°C, and the exchange time is 5h. where m(KCl) / m(K 2 CO 3 )=0.075, m(KOH) / m(K 2 CO 3 )=0.1, satisfying 0.075≤m(KCl) / m(K 2 CO 3 )≤0.35, 0.075≤m(KOH) / m(K 2 CO 3 )≤0.4.

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Abstract

The invention provides a fused salt for chemically enhancing medium-aluminum and high-aluminum silicate glass. The fused salt comprises the following compositions: KNO3, KOH, KCl and K2CO3, wherein a mass ratio of KOH to K2CO3 in the fused salt is 0.05-0.4; a mass ratio of KCl to K2CO3 is 0.075-1.0; and a mass ratio of KNO3 to K2CO3 is 100:(1.0-4.0). The invention further provides a method for performing chemically toughened enhancement by using the fused salt for chemical enhancing of medium-aluminum and high-aluminum silicate glass. The fused salt formula disclosed by the invention indicates a formula composition range suitable for chemical enhancing of the medium-aluminum and high-aluminum glass. According to the formula, corrosion on the glass surface can be avoided, and the chemically enhanced glass has high transmittance; and meanwhile, due to the formula disclosed by the invention, the surface stress and stress layer depth of the chemically enhanced glass can be greatly improved.

Description

technical field [0001] The invention relates to a molten salt formula for low-temperature ion exchange of glass, in particular to a molten salt for chemical strengthening of medium-aluminum and high-alumina silicate glass and a method for chemically strengthening it. Background technique [0002] The popularity of mobile electronic devices in recent years has enabled the widespread use of display screens. The development of thinner and lighter display screens puts forward requirements for thinner thickness and higher strength for medium aluminum and high aluminosilicate glass used for display screens. At present, the domestic cover glass and protective glass market is monopolized by foreign companies such as Corning of the United States, Asahi Glass of Japan, Denki Glass of Japan, and Schott of Germany. For domestic aluminum and high-alumina glass, the development of chemically strengthened molten salt suitable for domestic aluminum and high-alumina glass is of great signif...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C21/00C03C3/087
CPCC03C3/087C03C21/001
Inventor 刘超田月梅韩建军
Owner WUHAN UNIV OF TECH
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