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US 2018/0022637 A1Published application
Ion exchangeable glass with high crack initiation threshold
AssigneeCorning Incorporated
InventorTimothy Michael Gross
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Abstract
Alkali aluminosilicate glasses that are resistant to damage due to sharp impact and capable of fast ion exchange are provided. The glasses comprise at least 4 mol % P2O5 and, when ion exchanged, have a Vickers indentation crack initiation load of at least about 7 kgf.
Claims19
1-55. (canceled)
An alkali aluminosilicate glass comprising MgO;
- from about 40 mol % to about 70 mol % SiO2;
- from about 11 mol % to about 25 mol % Al2O3;
- from about 4 mol % to about 15 mol % P2O5;
- from about 13 mol % to about 20 mol % Na2O;
- less than 1 mol % B2O3;
- and 0 mol % K2O, wherein:
- i. the alkali aluminosilicate glass is free of Li2O;
- and
- ii. 1.3<[(P2O5+R2O)/M2O3]≦2.3, where M2O3=Al2O3+B2O3 and R2O is the sum of monovalent cation oxides present in the alkali aluminosilicate glass.
6 more elements
The alkali aluminosilicate glass of claim 69, wherein the potassium/sodium interdiffusion coefficient is in a range from about 2.4×10−10 cm2/s up to about 1.5×10−9 cm2/s at 410° C.
An alkali aluminosilicate glass comprising MgO;
- from about 40 mol % to about 70 mol % SiO2;
- from about 11 mol % to about 25 mol % Al2O3;
- from about 4 mol % to about 15 mol % P2O5;
- from about 13 mol % to about 20 mol % Na2O;
- less than 1 mol % B2O3;
- and 0 mol % K2O, wherein:
- i. the alkali aluminosilicate glass is ion exchanged to a depth of layer of at least about 10 μm;
- ii. the alkali aluminosilicate glass is free of Li2O;
- and
- iii. 1.3<[(P2O5+R2O)/M2O3]≦2.3, where M2O3=Al2O3+B2O3 and R2O is the sum of monovalent cation oxides present in the alkali aluminosilicate glass.
7 more elements
Dependencies are inferred from the claim text.