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US 2018/0022636 A1Published application
Ion-exchanged glass of high surface compression and shallow depth of layer with high resistance to radial crack formation from vickers indentation
AssigneeCorning Incorporated
InventorsJonathan David Pesansky, Chandan Kumar Saha, Trevor E. Wilantewicz
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Abstract
Disclosed are alkali aluminosilicate glasses having unexpected resistance to indentation cracking. The glasses obtain this high resistance as a result of a high level of surface compression accompanied by a shallow depth of layer. The advantaged glasses show greater resistance to radial crack formation from Vickers indentation than glasses with the same compressive stress, but higher depths of layer.
Claims14
A glass article comprising:
- about 40 mol % to about 70 mol % SiO2;
- about 11 mol % to about 25 mol % Al2O3;
- at least 4 mol % to about 15 mol.% P2O5;
- less than about 1 mol % B2O3;
- and
- from 13 mol % to about 25 mol % Na2O.
3 more elements
A glass article comprising:
- about 50 mol % to about 65 mol % SiO2;
- about 14 mol % to about 20 mol % Al2O3;
- 0 mol % to less than about 1 mol % B2O3;
- about 4 mol % to about 10 mol % P2O5;
- and
- from 14 mol % to about 20 mol % Na2O.
3 more elements
Dependencies are inferred from the claim text.