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US 12,358,837 B2Granted
Tough glass composite and method
AssigneeCorning Incorporated
InventorsIndrajit Dutta, Nicholas James Smith
Life of this patent
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Abstract
Embodiments of a glass substrate including an alkali-containing bulk and an alkali-depleted surface layer, including a substantially homogenous composition with at least 51 mol % Al2O3 are disclosed. In some embodiments, the alkali-depleted surface layer includes about 0.5 atomic % alkali or less. The alkali-depleted surface layer can be substantially free of hydrogen and/or crystallites. Methods for forming a glass substrate with a modified surface layer are also provided.
Claims17
A glass substrate comprising:
- an alkali-containing bulk comprising Al2O3 and SiO2;
- and
- an alkali-depleted surface layer comprising Al2O3 and SiO2,
- wherein:
- the alkali-depleted surface layer is substantially amorphous such that the alkali-depleted surface layer is less than 1% crystalline phase by volume;
- the alkali-depleted surface layer has a substantially homogenous composition comprising 57 mol % or more Al2O3;
- the alkali-depleted surface layer exhibits a cracking probability of 50% or less for a Vicker's indentation load of 10N;
- and
- the alkali-depleted surface layer is formed by thermal poling of the glass substrate.
6 more elements
Dependencies are inferred from the claim text.