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US 12,643,814 B2Granted
Glasses with improved tempering capabilities
AssigneeCorning Incorporated
InventorsTimothy Michael Gross, Peter Joseph Lezzi, Jingshi Wu
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Abstract
The disclosure relates to glass compositions having improved thermal tempering capabilities. The disclosed glass compositions have high coefficients of thermal expansion and Young's moduli, and are capable of achieving high surface compressions. A method of making such glasses is also provided.
Claims7
A glass composition, comprising:
- 60-65 mol % SiO2;
- 5-10 mol % Al2O3;
- 3-10 mol % MgO;
- 9-15 mol % CaO;
- >11-15 mol % Na2O+K2O;
- 11-15 mol % Na2O;
- >0 to 2 mol % K2O;
- and
- 3-8 mol % ZnO,
- wherein the glass composition has a low temperature coefficient of thermal expansion (LTCTE) measured at 25° C. and a high temperature coefficient of thermal expansion (HTCTE) measured at 300° C., and wherein the sum of the LTCTE and the HTCTE is 35×10−7/° C. or greater;
- and the glass composition has a temperability, Ψ, and the temperability, Ψ, is equal to or greater than 0.80;
- wherein the glass composition is substantially free of Li2O;
- and
- wherein the glass composition, when formed into a glass slab, exhibits a Young's modulus that is >67 GPa.
11 more elements
Dependencies are inferred from the claim text.