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Method for producing tempered glass with plurality of surface stress layers and tempered glass product

A tempered glass, surface compressive stress technology, applied in glass tempering, glass manufacturing equipment, manufacturing tools, etc., can solve problems that do not involve multi-step tempering of lithium-aluminosilicate glass, etc., to achieve high strength, reliable protection, and reliability guarantee Effect

Active Publication Date: 2012-12-12
SCHOTT GLASS TECH (SUZHOU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] The existing technology mainly involves the chemical tempering method of sodium aluminum silicate glass, but does not involve multi-step tempering of lithium aluminum silicate glass, and greatly improves the surface compressive stress, surface hardness and friction resistance of tempered glass

Method used

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  • Method for producing tempered glass with plurality of surface stress layers and tempered glass product
  • Method for producing tempered glass with plurality of surface stress layers and tempered glass product
  • Method for producing tempered glass with plurality of surface stress layers and tempered glass product

Examples

Experimental program
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Effect test

Embodiment 1

[0121] The glass in Example 1 is melted using oxides, hydroxides and carbonates as raw materials. After weighing and mixing, the mixture is put into a platinum crucible, and it is made on an electric furnace at 1550-1600°C. It is melted, then cast into a metal mold preheated to a suitable temperature, and then slowly cooled to produce a bulk glass, which is then precisely annealed at annealing temperature to relieve internal stress. The precision annealed glass was cut into thin slices, then polished on both sides and edged with a CNC machine tool to obtain a glass sample of 100x60x0.7mm.

[0122] The glass samples were chemically tempered by a two-step method, in which the molar ratio of Li:Na:K in the molten salt used in the first step was 0.1:99.8:0.1, the glass samples were immersed in the molten salt, tempered at 390°C for 4 hours, and then The glass is removed from the molten salt, cooled to room temperature, rinsed with clean water and dried. Then immersed in the secon...

Embodiment 2

[0125] The process of glass melting and glass sample preparation in Example 2 is the same as that in Example 1. The glass samples were tempered by one-step mixed molten salt, the molar ratio of Li:Na:K in the molten salt was 0.1:5:95, both were prepared with nitrate, and the glass samples were tempered at 410°C for 4 hours by immersing in the molten salt. The tempered glass has K DoL of 15μm and Na DoL of 136μm, surface compressive stress of 710MPa and 670kgf / mm 2 Vickers hardness.

Embodiment 7

[0126] The glass melting and glass sample preparation process in Example 7 are the same as in Example 1. The glass samples were tempered in molten salt in three steps, in which the molar ratio of Li:Na:K in the molten salt used in the first step was 0.1:98.9:1, the glass samples were immersed in the molten salt and tempered at 390 °C for 4 hours, and then Take the glass out of the first molten salt, immerse it directly in the second molten salt without cooling, wherein the molar ratio of Li:Na:K is 0.2:4.8:95, temper at 410°C for 0.3 hour, and then remove the glass from the second molten salt Take it out from the second molten salt, immerse it directly in the third molten salt without cooling, wherein the molar ratio of Li:Na:K is 0.02:0.2:99.78, and temper at 420° C. for 4 hours. The molten salts in the first step, the second step and the third step are all prepared by using corresponding alkali metal nitrates. The tempered glass has K DoL of 21μm and Na DoL of 162μm, surfac...

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Abstract

The invention discloses a method for producing tempered glass with a plurality of surface stress layers and a tempered glass product and particularly relates to a method for producing tempered lithium glass with a plurality of surface stress layers. The method comprises that a mixed salt bath is used for conducting ion exchange in a step, or various mixed salt baths are used for conducting several ion exchange in a plurality of steps. By the aid of the novel chemical tempered lithium aluminosilicate glass and the treatment method of relative glass products, glass with the plurality of surface stress layers and products of the glass are obtained, and the product serves as a high-strength cover plate in electronic devices, household appliances and vehicles. Compared with the prior art, the tempered glass with the plurality of surface stress layers can protect electronic devices, household appliances and vehicles reliably.

Description

technical field [0001] The present invention relates to a chemical treatment method for tempered alkali metal aluminosilicate glass. In particular, the present invention relates to chemical treatment methods for tempering alkali metal silicate glass using molten alkali metal salts or mixtures thereof. More particularly, the present invention relates to a chemical treatment process for tempering lithium-containing alkali metal silicate glasses using one or more molten alkali metal salts or mixtures thereof using multiple steps. Tempered glass is used as protective glass for touch panels, monitors, consumer electronics, home appliances, and vehicles. Background technique [0002] Glasses with high mechanical strength are required in applications as displays, protective windows, such as automobiles, trains, aircraft, various types of white goods, such as shelves or doors for refrigerators, and brown goods, such as televisions. In particular, the rapid growth of the consumer e...

Claims

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Application Information

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IPC IPC(8): C03B27/03C03C3/097
Inventor 王冲和峰乔斯・西默鲁迪格尔・迪特里希
Owner SCHOTT GLASS TECH (SUZHOU) CO LTD
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