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Fused salt for chemically enhancing medium-aluminum and high-aluminum silicate glass and method for performing chemically-toughened enhancement by using fused salt

A high-aluminosilicate and glass technology, which is applied in the field of molten salt for chemical strengthening of medium-alumina and high-aluminosilicate glass, and in the field of chemical strengthening, which can solve the problems of many types of additives, long tempering time, and high cost, and achieve ionic strength. Increased exchange rate, corrosion prevention, and high transmittance effects

Active Publication Date: 2017-07-28
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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  • Fused salt for chemically enhancing medium-aluminum and high-aluminum silicate glass and method for performing chemically-toughened enhancement by using fused salt

Examples

Experimental program
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Effect test

Embodiment 1

[0024] The above-mentioned original glass pieces are cut and edged, cleaned, and put into a preheating furnace for preheating. The preheating temperature is 380℃. The temperature is increased with the furnace and kept for half an hour, and then quickly transferred to the molten molten salt. The molten salt temperature is 430℃, the ion exchange time is 4 hours, after the exchange is completed, take it out to cool down naturally, and use a stress tester to test the stress of the glass and the depth of the stress layer.

[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 part 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℃, 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℃, 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-aluminosilicate glass and a method for chemically strengthening the same. Background technique [0002] In recent years, the popularity of mobile electronic devices has made display screens widely used. The light and thin development of the display screen puts forward the requirements of thin thickness and high strength for the medium aluminum and high aluminum silicate glass used in the display screen. At present, the domestic cover glass and protective glass market is monopolized by foreign companies such as Corning of the United States, Asahi Glass, Electric Glass of Japan, and Schott of Germany. For domestic medium aluminum and high aluminum glass, the development of chemically strengthened molten salts suitable for domestic medium aluminum and high aluminum glass is of great sig...

Claims

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Application Information

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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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