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US 11,767,254 B2Granted
Glasses with low excess modifier content
AssigneeCorning Incorporated
InventorsTimothy Michael Gross, Xiaoju Guo, Peter Joseph Lezzi, Alexandra Lai Ching Kao Andrews Mitchell, Rostislav Vatchev Roussev
Life of this patent
Estimating the term…
Abstract
A glass composition includes: from 55.0 mol % to 70.0 mol % SiO2; from 12.0 mol % to 20.0 mol % Al2O3; from 5.0 mol % to 15.0 mol % Li2O; and from 4.0 mol % to 15.0 mol % Na2O. The glass composition has the following relationships −8.00 mol %≤R2O+RO−Al2O3−B2O3−P2O5≤−1.75 mol %, 9.00≤(SiO2+Al2O3+Li2O)/Na2O, and (Li2O+Al2O3+P2O5)/(Na2O+B2O3)≤3.50. The glass composition may be used in a glass article or a consumer electronic product.
Claims7
A glass article comprising:
- a first surface;
- a second surface opposite the first surface, wherein a thickness (t) of the glass article is measured as a distance between the first surface and the second surface;
- and
- a compressive stress layer extending from at least one of the first surface and the second surface into the thickness (t) of the glass article, wherein
- a central tension of the glass article is greater than or equal to 60 MPa,
- the compressive stress layer has a depth of compression that is from greater than or equal to 0.15t to less than or equal to 0.25t, and
- the glass article is formed from a glass comprising:
- from greater than or equal to 55.0 mol % to less than or equal to 70.0 mol % SiO2;
- from greater than or equal to 12.0 mol % to less than or equal to 20.0 mol % Al2O3;
- from greater than or equal to 5.0 mol % to less than or equal to 15.0 mol % Li2O;
- and
- from greater than or equal to 4.0 mol % to less than or equal to 10.0 mol % Na2O,
- wherein:
- −8.00 mol %≤R2O+RO −Al2O3−B2O3−P2O5≤−1.75 mol %,
- 9.00≤(SiO2+Al2O3+Li2O)/Na2O,
- 1.50≤(Li2O+Al2O3+P2O5)/(Na2O+B2O3)≤3.50, and
- RO is the sum of divalent cation oxides and R2O is the sum of alkali metal oxides.
14 more elements
A glass article comprising:
- a first surface;
- a second surface opposite the first surface, wherein a thickness (t) of the glass article is measured as a distance between the first surface and the second surface;
- and
- a compressive stress layer extending from at least one of the first surface and the second surface into the thickness (t) of the glass article, wherein
- a central tension of the glass article is greater than or equal to 60 MPa,
- the compressive stress layer has a depth of compression that is from greater than or equal to 0.15t to less than or equal to 0.25t, and
- the glass article has a composition at a center depth of the glass article comprising:
- from greater than or equal to 55.0 mol % to less than or equal to 70.0 mol % SiO2;
- from greater than or equal to 12.0 mol % to less than or equal to 20.0 mol % Al2O3;
- from greater than or equal to 5.0 mol % to less than or equal to 15.0 mol % Li2O;
- and
- from greater than or equal to 4.0 mol % to less than or equal to 10.0 mol % Na2O,
- wherein:
- −8.00 mol %≤R2O+RO−Al2O3−B2O3−P2O5≤−1.75 mol %,
- 9.00≤(SiO2+Al2O3+Li2O)/Na2O,
- 1.50≤(Li2O+Al2O3+P2O5)/(Na2O+B2O3)≤3.50, and
- RO is the sum of divalent cation oxides and R2O is the sum of alkali metal oxides.
14 more elements
Dependencies are inferred from the claim text.