Fusion formable and steam strengthenable glass compositions with platinum compatibility
AssigneeCorning Incorporated
InventorsTimothy Michael Gross, Jingshi Wu
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Abstract
Glass-based articles that include a compressive stress layer extending from a surface of the glass-based article to a depth of compression are formed by exposing glass-based substrates to water vapor containing environments. The glass-based substrates have compositions selected to be fusion formable, to be steam strengthen able, and to avoid the formation of platinum defects during the forming process. The methods of forming the glass-based articles may include elevated pressures and/or multiple exposures to water vapor containing environments.
Claims30
A glass-based article, comprising:
- a compressive stress layer extending from a surface of the glass-based article to a depth of compression,
- a hydrogen-containing layer extending from the surface of the glass-based article to a depth of layer, and
- a composition at the center of the glass-based article, comprising:
- SiO2,
- Al2O3,
- K2O,
- R2O/Al2O3 in an amount that is less than or equal to 1.4, wherein R2O is the total amount of monovalent metal oxides,
- greater than or equal to 3.5 mol % to less than or equal to 6.0 mol % P2O5, and
- greater than or equal to 2.0 mol % to less than or equal to 5.0 mol % Li2O, wherein:
- the compressive stress layer comprises a compressive stress greater than or equal to 25 MPa,
- a hydrogen concentration of the hydrogen-containing layer decreases from a maximum hydrogen concentration to the depth of layer, and
- the depth of layer is greater than 5 μm.
A glass-based article, comprising:
- a compressive stress layer extending from a surface of the glass-based article to a depth of compression,
- a hydrogen-containing layer extending from the surface of the glass-based article to a depth of layer, and
- a composition at the center of the glass-based article, comprising:
- SiO2,
- Al2O3,
- K2O,
- 1.4<(R2O+P2O5)/Al2O3<1.9, wherein R2O is the total amount of monovalent metal oxides,
- greater than or equal to 3.5 mol % to less than or equal to 6.0 mol % P2O5, and
- greater than or equal to 2.0 mol % to less than or equal to 5.0 mol % Li2O, wherein:
- the compressive stress layer comprises a compressive stress greater than or equal to 25 MPa,
- a hydrogen concentration of the hydrogen-containing layer decreases from a maximum hydrogen concentration to the depth of layer, and
- the depth of layer is greater than 5 μm.
A glass-based article, comprising:
- a compressive stress layer extending from a surface of the glass-based article to a depth of compression,
- a hydrogen-containing layer extending from the surface of the glass-based article to a depth of layer, and
- a composition at the center of the glass-based article, comprising:
- SiO2,
- Al2O3,
- K2O,
- 1.4<(R2O+P2O5)/Al2O3<1.9, wherein R2O is the total amount of monovalent metal oxides, and
- greater than or equal to 3.5 mol % to less than or equal to 6.0 mol % P2O5, wherein:
- the compressive stress layer comprises a compressive stress greater than or equal to 25 MPa,
- a hydrogen concentration of the hydrogen-containing layer decreases from a maximum hydrogen concentration to the depth of layer,
- the depth of layer is greater than 5 μm, and
- the glass-based article exhibits no substantial phase separation.
A glass, comprising:
- greater than or equal to 55.0 mol % to less than or equal to 65.0 mol % SiO2,
- greater than or equal to 10.0 mol % to less than or equal to 15.0 mol % Al2O3,
- greater than or equal to 0 mol % to less than or equal to 10.0 mol % B2O3,
- greater than or equal to 6.0 mol % to less than or equal to 15.0 mol % K2O,
- greater than or equal to 3.5 mol % to less than or equal to 6.0 mol % P2O5, and
- 1.4<(R2O+P2O5)/Al2O3<1.9, wherein R2O R2O is the total amount of monovalent metal oxides,
- wherein the glass exhibits no substantial phase separation.
Dependencies are inferred from the claim text.