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Aluminosilicate glass for chemical tempering and glass ceramics

A kind of aluminosilicate glass, chemical tempering technology, applied in the field of aluminosilicate glass containing Li2O and P2O5, glass ceramics, can not meet the requirements of 3D molding, can not meet the high DoL, not suitable for melting and forming Equipment and other issues

Active Publication Date: 2012-09-26
SCHOTT GLASS TECH (SUZHOU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Either glass can achieve high DoL but T g Also high, can not meet the requirements of 3D molding; or glass can achieve low T g But the DoL is also low and cannot meet the requirements of high DoL
[0024] And glass compositions in the prior art mostly have quite high melting temperature and high glass transition temperature (T g ), therefore, not suitable for use in existing melting and forming equipment

Method used

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  • Aluminosilicate glass for chemical tempering and glass ceramics
  • Aluminosilicate glass for chemical tempering and glass ceramics
  • Aluminosilicate glass for chemical tempering and glass ceramics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0170] Table 1 lists examples within preferred compositional ranges. The glass of the embodiment of the present invention and comparative example is prepared according to the following steps: raw material oxide, hydroxide, carbonate and nitrate etc. (all purchased from Sinopharm Group Chemical Reagent Co., Ltd., Suzhou, chemical grade), after weighing and After mixing, the mixture was placed in a platinum crucible. It is then placed in an electric furnace, melted at 1550-1600°C, cast in a stainless steel mold preheated to 400°C, and cooled slowly for the next step of processing.

[0171] The transition temperature T of the glass in this experiment g , Yield point AT (refers to the deformation point temperature on the thermal expansion curve) and thermal expansion coefficient CTE, measured on a relaxation thermal dilatometer (relaxation DIL402PC). After the glass sample is made into a strip sample of about 50mm, the temperature is raised from room temperature at a rate of 5°C...

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Abstract

The invention discloses aluminosilicate glass for chemical tempering and glass ceramics, and particularly discloses aluminosilicate glass which contains Li2O and P2O5 and can be chemically tempered. The glass of the invention can realize high ion exchange speed by the addition of 0.01-8 wt% of P2O5. The glass of the invention contains 2-6 wt% of Li2O, which can reduce the glass melting temperature and the glass-transition temperature. The glass of the invention has a low glass-transition temperature (Tg) of 480-590 DEG C, and the glass hardness is at least 600 Kg / mm2. After chemical tempering, the glass of the invention has a large surface stress layer depth (DoL) and a high surface crushing stress (CS). After tempering in pure KNO3, a potassium ion stress layer is formed, which has a DoL of at least 20 microns and a CS of at least 600 MPa. After tempering in a mixed salt of KNO3 and NaNO3 or two-step tempering in KNO3 and NaNO3, a potassium and sodium ion stress layers can be formed simultaneously, which have a DoL of at least 50 microns and a CS of at least 600 MPa. In addition, the aluminosilicate glass of the invention can be converted into glass ceramics through further heat treatment.

Description

Technical field [0001] The present invention relates to aluminosilicate glass suitable for chemical tempering, and further relates to aluminosilicate glass suitable for chemical tempering containing Li. 2 O and P 2 O 5 of aluminosilicate glass. The invention also relates to products made from the chemically tempered glass. The aluminosilicate glass of the present invention is suitable for 3D molding and thermal bending, curved surface thermal bending, infrared bending and other thermoforming technologies. In addition, the present invention also relates to glass ceramics obtained by further heat treatment of aluminosilicate glass. Background technique [0002] Protective glass is commonly used in electronic devices, mobile electronic devices such as personal data assistants, mobile or cellular phones, watches, laptops and laptops, digital cameras, PDAs, or as base glass for touch screens and televisions. There is a strong need for protective glass with larger dimensions ...

Claims

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Application Information

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IPC IPC(8): C03C3/118C03C3/097C03C10/16C03C10/14
CPCC03C21/002C03C10/0036C03C10/0054C03C3/097C03C3/118C03C1/004
Inventor 张广军格哈德·劳滕施勒格尔乔斯·西默马蒂亚斯·贝泽尔
Owner SCHOTT GLASS TECH (SUZHOU) CO LTD
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