Glass compositions and methods with steam treatment haze resistance
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 avoid the formation of haze during the treatment process. The methods of forming the glass-based articles may include elevated pressures and/or multiple exposures to water vapor containing environments selected to avoid the formation of haze during the treatment process.
Claims20
A glass sheet strengthened by steam treatment, comprising:
- a surface;
- and
- a hydrogen-containing layer extending from the surface to a depth of layer, where the depth of layer corresponds to a depth below the surface at which hydrogen concentration has decreased to equal that at a center of the glass sheet, wherein the depth of layer is greater than 10 μm;
- wherein hydrogen species of the hydrogen-containing layer impart a compressive stress in the glass sheet, and wherein the compressive stress is greater than 50 MP a.
A glass sheet strengthened by steam treatment, comprising:
- a surface;
- and
- a compressive stress layer extending from the surface to a depth of compression, where the depth of compression corresponds to a depth below the surface at which stress state within the glass sheet changes from compression to tension, wherein the depth of compression greater than 10 μm;
- wherein hydrogen species impart the compressive stress, wherein the compressive stress is greater than 50 MPa.
A glass sheet strengthened by steam treatment, comprising:
- a surface;
- and
- a hydrogen-containing layer extending from the surface to a depth of layer, where the depth of layer corresponds to a depth below the surface at which hydrogen concentration decreases to be equal to that at a center of the glass sheet;
- wherein hydrogen species of the hydrogen-containing layer impart a compressive stress in the glass sheet, wherein the hydrogen species are H3O+, H2O, and/or H+, and
- wherein weight of the glass sheet is at least 0.01% greater than that of an otherwise identical glass sheet without the steam treatment.
Dependencies are inferred from the claim text.