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US 2017/0283303 A1Published application
Ion exchangeable glasses with high crack initiation threshold
AssigneeCorning Incorporated
InventorsQiang FU, Xiaoju GU
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.
Claims20
A glass composition comprising:
- from about 60 to about 70 mol % SiO2
- from about 8 to about 13 mol % A12O3
- from about 9 to about 15 mol % B2O3
- from about 2 to about 8 mol % MgO
- from about 8 to about 13 mol % Na2O.
2 more elements
A method comprising making a glass sheet by floating a glass composition comprising:
- from about 60 to about 70 mol % SiO2
- from about 8 to about 13 mol % Al2O3
- from about 9 to about 15 mol % B2O3
- from about 2 to about 8 mol % MgO
- from about 8 to about 13 mol % Na2O,
- on a tin float bath.
3 more elements
Dependencies are inferred from the claim text.