Ion exchangable glass with deep compressive layer and high damage threshold
AssigneeCorning Incorporated
InventorsDana Craig Bookbinder, Timothy Michael Gross, Marcel Potuzak
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Abstract
Glasses comprising SiO2, Al2O3, and P2O5 that are capable of chemical strengthened by ion exchange and having high damage resistance. These phosphate-containing glasses have a structure in which silica (SiO2) is replaced by aluminum phosphate (AlPO4) and/or boron phosphate (BPO4).
Claims34
A glass comprising SiO2, 16 to about 28 mol % Al2O3, P2O5, and at least one alkali metal oxide (R2O), wherein R2O is selected from the group consisting of Na2O and K2O, wherein 0.75≦[(P2O5(mol %)+R2O(mol %))/M2O3 (mol %)]≦1.3, where M2O3=Al2O3+B2O3, and wherein the glass is lithium-free.
A glass comprising SiO2, 16 to about 28 mol % Al2O3, P2O5, and at least one alkali metal oxide (R2O), wherein R2O is selected from the group consisting of Na2O and K2O, wherein 0.75≦[(P2O5(mol %)+R2O(mol %))/M2O3 (mol %)]≦1.3 and M2O3=Al2O3+B2O3, wherein the glass is lithium-free, and wherein the glass, when ion exchanged, has a Vickers crack initiation threshold of at least about 10 kgf.
Dependencies are inferred from the claim text.