Crack and scratch resistant glass and enclosures made therefrom
AssigneeCorning Incorporated
InventorsKristen L. Barefoot, Matthew John Dejneka, Sinue Gomez, Timothy Michael Gross, Nagaraja Shashidhar
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Abstract
A glass and an enclosure, including windows, cover plates, and substrates for mobile electronic devices comprising the glass. The glass has a crack initiation threshold that is sufficient to withstand direct impact, has a retained strength following abrasion that is greater than soda lime and alkali aluminosilicate glasses, and is resistant to damage when scratched. The enclosure includes cover plates, windows, screens, and casings for mobile electronic devices and information terminal devices.
Claims33
A glass comprising:
- at least 58 mol % SiO2;
- at least 8 mol % Na2O;
- 5.5-12 mol % B2O3;
- and
- Al2O3;
- wherein a ratio
- Al
- 2
-
- O
- 3
- (
- mol
-
- %
- )
- +
- B
- 2
-
- O
- 3
- (
- mol
-
- %
- )
- ∑
- modifiers
- (
- mol
-
- %
- )
- >
- 1
- ,
- the modifiers are one or more alkali metal oxide (R2O) and one or more alkaline earth oxide (RO);
- wherein Al2O3 (mol %)>B2O3 (mol %) and 0.9<R2O/Al2O3<1.3, wherein the glass is substantially free of Li2O.
A glass comprising:
- at least 58 mol % SiO2;
- at least 8 mol % Na2O;
- 2-12 mol % B2O3;
- and
- Al2O3;
- wherein a ratio
- Al
- 2
-
- O
- 3
- (
- mol
-
- %
- )
- +
- B
- 2
-
- O
- 3
- (
- mol
-
- %
- )
- ∑
- modifiers
- (
- mol
-
- %
- )
- >
- 1
- ,
- the modifiers are one or more alkali metal oxide (R2O) and one or more alkaline earth oxide (RO);
- wherein 0.9<R2O/Al2O3<1.3, Al2O3 (mol %)>B2O3 (mol %), and wherein the glass is defined by the following equation −5.7 mol %<Σ modifiers−Al2O3<2.17 mol %.
A glass comprising:
- at least 58 mol % SiO2;
- at least 8 mol % Na2O;
- 2-10 mol % B2O3;
- Al2O3;
- and
- wherein a ratio
- Al
- 2
-
- O
- 3
- (
- mol
-
- %
- )
- +
- B
- 2
-
- O
- 3
- (
- mol
-
- %
- )
- ∑
- modifiers
- (
- mol
-
- %
- )
- >
- 1
- ,
- the modifiers are one or more alkali metal oxide (R2O) and one or more alkaline earth oxide (RO);
- wherein 0.9<R2O/Al2O3<1.3, and wherein the glass is defined by the following equation −5.7 mol %<Σ modifiers−Al2O3<2.17 mol %.
An aluminoborosilicate glass comprising:
- at least 58 mol % SiO2;
- 9-17 mol % Al2O3;
- 2-12 mol % B2O3;
- 8-16 mol % Na2O;
- >0-2 mol % SnO2;
- and
- 0 mol % P2O5,
- wherein
- Al
- 2
-
- O
- 3
- (
- mol
-
- %
- )
- +
- B
- 2
-
- O
- 3
- (
- mol
-
- %
- )
- Σ
-
- modifiers
-
- (
- mol
-
- %
- )
- >
- 1
- ,
- wherein the modifiers are one or more alkali metal oxide (R2O) and one or more alkaline earth metal oxide (RO),
- wherein Al2O3 (mol %)>B2O3 (mol %),
- wherein 1<R2O (mol %)/Al2O3 (mol %)<1.3,
- wherein the glass has a Vickers crack initiation threshold of greater than 500 gf, and
- wherein the glass is substantially free of lithium.
Dependencies are inferred from the claim text.