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US 2015/0147575 A1Published application
Fast ion exchangeable glasses with high indentation threshold
AssigneeCorning Incorporated
InventorsMatthew John Dejneka, John Christopher Mauro
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Abstract
Alkali aluminosilicate glasses that are ion exchangeable to high compressive stresses, have fast ion exchange kinetics, and high intrinsic damage resistance. The glasses achieve all of the above desired properties either with only small amounts of P2O5 (<1 mol %) or without addition of any P2O5.
Claims30
A glass, the glass comprising:
- from about 50 mol % to about 72 mol % SiO2;
- from about 12 mol % to about 22 mol % Al2O3;
- up to about 6.5 mol % B2O3;
- up to about 1 mol % P2O5;
- from about 11 mol % to about 21 mol % Na2O;
- up to about 0.95 mol % K2O;
- up to about 4 mol % MgO;
- up to about 5 mol % ZnO;
- and
- up to about 2 mol % CaO, wherein
- Na2O+K2O−Al2O3≦2.0 mol,
- B2O3−(Na2O+K2O−Al2O3)>1 mol %,
- 24 mol %≦RAlO4≦45 mol %, where R is at least one of Na, K, and Ag, and
- the glass is substantially free of TiO2.
11 more elements
A glass comprising:
- from about 55 mol % to about 62 mol % SiO2;
- from about 16 mol % to about 20 mol % Al2O3;
- from about 4 mol % to about 6.5 mol % B2O3;
- from about 14 mol % to about 18 mol % Na2O;
- from about 0.2 mol % to about 0.75 mol % K2O;
- up to about 0.5 mol % MgO;
- up to about 0.5 mol % ZnO;
- and
- up to about 0.5 mol % CaO, wherein
- the glass is substantially free of P2O5,
- Na2O+K2O−Al2O3≦0.5 mol %,
- B2O3−(Na2O+K2O−Al2O3)>4 mol %,
- 28 mol %≦RAlO4≦45 mol %, where R is at least one of Na, K, and Ag, and
- the glass is substantially free of TiO2.
11 more elements
Dependencies are inferred from the claim text.