Chemically strengthened glass, and glass for chemical strengthening
AssigneeAGC Inc.
InventorsSuguru Murayama, Seiki Ohara, Qing Li, Shusaku Akiba
Life of this patent
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Abstract
A glass for chemical strengthening contains, in mole percentage on an oxide basis, 58 to 80% of SiO2, 13 to 18% of Al2O3, 0 to 5% of B2O3, 0.5 to 4% of P2O5, 4 to 10% of Li2O, 5 to 14% of Na2O, 0 to 2% of K2O, 0 to 11% of MgO, 0 to 5% of CaO, 0 to 20% of SrO, 0 to 15% of BaO, 0 to 10% of ZnO, 0 to 1% of TiO2, and 0 to 2% of ZrO2. A value of X is 30000 or more. The value of X is calculated based on the formula, X=SiO2×329+Al2O3×786+B2O3×627+P2O5×(−941)+Li2O×927+Na2O×47.5+K2O×(−371)+MgO×1230+CaO×1154+SrO×733+ZrO2×51.8, by using the contents in mole percentage on an oxide basis of components.
Claims11
A glass for chemical strengthening, comprising, in mole percentage on an oxide basis, 68 to 72% of SiO2, 7 to 11% of Al2O3, 0 to 3% of B2O3, 0 to 4% of P2O5, 4 to 10% of Li2O, 2 to 7% of Na2O, 0 to 2% of K2O, 5 to 11% of MgO, 0 to 5% of CaO, 0 to 20% of SrO, 0 to 15% of BaO, 0 to 10% of ZnO, 0 to 1% of TiO2, and 0 to 1.2% of ZrO2,
- wherein:
- a devitrification temperature T of the glass is 1200° C. or lower;
- and
- a value of X is 30000 or more, the value of X being calculated based on the following formula by using contents in mole percentage on an oxide basis of components of SiO2, Al2O3, B2O3, P2O5, Li2O, Na2O, K2O, MgO, CaO, SrO, BaO, and ZrO2:
- X=SiO2×329+Al2O3×786+B2O3×627+P2O5×(−941)+Li2O×927+Na2O×47.5+K2O×(−371)+MgO×1230+CaO×1154+SrO×733+ZrO2×51.8.
Dependencies are inferred from the claim text.