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US 9,751,798 B2Granted
White, opaque,β-spodumene glass-ceramic articles with inherent damage resistance and methods for making the same
AssigneeCorning Incorporated
InventorsGeorge Halsey Beall, Qiang Fu, Charlene Marie Smith, Randall Eugene Youngman
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Abstract
Crystallizable glasses, glass-ceramics, IXable glass-ceramics, and IX glass-ceramics are disclosed. The glass-ceramics exhibit β-spodumene ss as the predominant crystalline phase. These glasses and glass-ceramics, in mole %, include: 60-75 SiO2; 10-18 Al2O3; 5-14 Li2O; and 4.5 B2O3. The glass-ceramics also have a Vickers initiation crack threshold of at least about 25 kgf.
Claims28
A glass-ceramic article comprising:
- a) a composition, in mole %, comprising:
- i) SiO2 in a range from about 60 to about 75,
- ii) Al2O3 in a range from about 10 to about 18,
- iii) Li2O in a range from about 5 to about 14, and
- iv) B2O3 in a range from about 10 to about 20,
- wherein a ratio of the mole sum total [Li2O+Na2O+K2O+MgO+ZnO]/moles of [Al2O3] is in a range from about 0.8 to about 1.5;
- and
- b) a Vickers crack initiation threshold of a least about 25 kgf. wherein β-spodumene is the predominant crystalline phase.
5 more elements
A glass-ceramic article comprising:
- a) a composition, in mole %, comprising:
- i) SiO2 in a range from about 60 to about 75,
- ii) Al2O3 in a range from about 10 to about 18,
- iii) Li2O in a range from about 5 to about 14,
- iv) B2O3 in a range from about 8 to about 20,
- v) TiO2 in a range from about 2 to about 5, and
- vi) SnO2 in a range from about 0.05 to about 0.5;
- and
- b) a Vickers crack initiation threshold of a least about 25 kgf,
- wherein β-spodumene is the predominant crystalline phase.
7 more elements
Dependencies are inferred from the claim text.