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US 11,306,019 B2Granted
Ion exchangeable glasses with high crack initiation threshold
AssigneeCorning Incorporated
InventorsQiang Fu, Xiaoju Guo
Life of this patent
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Abstract
Alkali boroaluminosilicate glasses with high resistance to crack initiation and damage due to sharp impact are provided. The glass compositions have melting and forming temperatures that allow forming the glass into sheets via float-based processes while still allowing for the glass to be efficiently ion exchanged. The glass compositions contain MgO, and when ion exchanged, have a Vickers indentation crack initiation load of at least about 10-15 kgf.
Claims10
A glass composition comprising:
- from 65 to 72 mol % SiO2
- from 8 to 13 mol % Al2O3
- from 9 to 15 mol % B2O3
- from 3 to 10 mol % MgO
- from 8 to 12 mol % Na2O and
- from 8 to 12 mol % M2O wherein M2O is Li2O, Na2O, K2O, Rb2O, and Cs2O
- wherein said glass composition is capable of being formed into sheets via a float process and has a Vickers indentation crack initiation load of at least about 12 kgf after ion exchange.
4 more elements
Dependencies are inferred from the claim text.