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US 9,517,967 B2Granted
Ion exchangeable glass with high damage resistance
AssigneeCorning Incorporated
InventorsMatthew John Dejneka, Adam James Ellison, John Christopher Mauro
Life of this patent
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Abstract
An ion exchangeable glass having a high degree of resistance to damage caused by abrasion, scratching, indentation, and the like. The glass comprises alumina, B2O3, and alkali metal oxides, and contains boron cations having three-fold coordination. The glass, when ion exchanged, has a Vickers crack initiation threshold of at least about 30 kilogram force.
Claims21
A glass comprising:
- a. at least about 50 mol % SiO2;
- b. at least about 10 mol % R2O, wherein R2O comprises at least about 10 mol % Na2O;
- c. from 12 mol % to about 22 mol % Al2O3, wherein −1.61 mol %≦Al2O3(mol %)−R2O(mol %)≧2 mol %;
- d. from greater than 0 mol % up to 5 mol % B2O3, wherein B2O3(mol %)−(R2O(mol %)−Al2O3(mol %))≧4.5 mol %;
- and
- e. at least 0.1 mol % of at least one of MgO and ZnO, wherein the glass is ion exchangeable.
3 more elements
A glass comprising:
- at least about 50 mol % SiO2;
- at least about 10 mol % R2O, wherein R2O comprises at least about 10 mol % Na2O;
- from 12 mol % to about 22 mol % Al2O3;
- greater than about 2.5 mol % to 5 mol % B2O3;
- and at least 0.1 mol % of at least one of MgO and ZnO, wherein B2O3(mol %)−(R2O(mol %)−Al2O3(mol %))≧4.5 mol %, wherein the glass has a zircon breakdown temperature at which the viscosity of the glass is greater than about 40 kPoise.
2 more elements
A glass, wherein the glass is ion exchanged and has a Vickers crack initiation threshold of at least about 30 kgf, the glass comprising:
- a. at least about 60 mol % SiO2;
- b. at least about 10 mol % R2O, wherein R2O comprises at least about 10 mol % Na2O;
- c. from 12 mol % to about 22 mol % Al2O3, wherein −1.61 mol %≦Al2O3(mol %)−R2O(mol %)≦2 mol %;
- d. from greater than 0 mol % up to 5 mol % B2O3, wherein B2O3(mol %)−(R2O(mol %)−Al2O3(mol %))≧4.5 mol %;
- and
- e. at least 0.1 mol % of at least one of MgO and ZnO, wherein the glass is ion exchangeable.
3 more elements
Dependencies are inferred from the claim text.