Aluminosilicate glasses and glass ceramics for chemical toughening
A kind of aluminosilicate glass, chemical tempering technology, applied in the field of aluminosilicate glass containing Li2O and P2O5, glass ceramics, can solve the problem that it is not suitable for melting and forming equipment, can not meet the requirements of 3D molding, can not meet the high DoL and other issues
Active Publication Date: 2016-08-03
SCHOTT GLASS TECH (SUZHOU) CO LTD
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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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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 present invention discloses an aluminosilicate glass and a glass ceramics for chemical tempering, specifically a novel aluminosilicate glass comprising Li2O and P2O5 for chemical tempering. The glass of the present invention can have a high ion exchange rate by adding 0.01-8 wt% of P2O5. The glass of the present invention comprises 2-6 wt% of Li2O, which can reduce the glass molten temperature and glass transition temperature. The glass of the present invention has a low glass transition temperature (Tg) of 480-590°C, and a glass hardness of at least 600 Kg / mm. The glass of the present invention has a large depth of the surface compressive layer (DoL) and a high surface compressive stress (CS) after being chemical tempered. After tempering in pure KNO3, a surface compressive layer of potassium ion can be formed with a DoL of at least 20 µm and a CS of at least 600 MPa. And tempering in mixed salts of KNO3 and NaNO3 or a two-step tempering by using KNO3 and NaNO3 can form potassium and sodium ion compressive layers at the same time with a DoL of at least 50 µm and a CS of at least 600 MPa. In addition, the aluminosilicate glass of the present invention can be further subjected to thermal treatment to convert to glass ceramics.
Description
technical field [0001] The present invention relates to aluminosilicate glass suitable for chemical toughening, and further relates to aluminosilicate glass suitable for chemical toughening containing Li 2 O and P 2 o 5 aluminosilicate glass. The invention also relates to products made by using 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 thermal forming techniques. In addition, the invention also relates to glass ceramics obtained from aluminosilicate glass through further heat treatment. Background technique [0002] Protective glass is commonly used in electronic devices, mobile electronic devices such as personal data assistants, mobile or cellular phones, watches, laptop and notebook computers, digital cameras, PDAs, or as substrate glass for touch screens, televisions. Protective glass with larger dimensions and / or 3D shap...
Claims
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IPC IPC(8): C03C3/118C03C3/097C03C10/16C03C10/14
CPCC03C1/004C03C3/097C03C3/118C03C10/0036C03C10/0054C03C21/002
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