Ion exchanged, fast cooled glasses
AssigneeCorning Incorporated
InventorsMatthew John Dejneka, Adam James Ellison, Sinue Gomez
Life of this patent
Estimating the term…
Abstract
A glass that is ion exchangeable to a depth of at least 20 μm (microns) and has a internal region having a tension of less than or equal to 100 MPa. The glass is quenched or fast cooled from a first temperature above the anneal point of the glass to a second temperature that is below the strain point of the glass. In one embodiment, the glass is a silicate glass, such as an alkali silicate glass, an alkali aluminosilicate glass, an aluminosilicate glass, a borosilicate glass, an alkali aluminogermanate glass, an alkali germanate glass, an alkali gallogermanate glass, and combinations thereof.
Claims18
A glass article, the glass article having an anneal point and a strain point, wherein the glass article is quenched from a first temperature that is greater than the anneal point of the glass article to a second temperature, wherein the second temperature is less than the strain point of the glass article, the glass article comprising:
- 60-70 mol % SiO2;
- 6-14 mol % Al2O3;
- 0-15 mol % B2O3;
- 0-2.5 mol % Li2O;
- 0-20 mol % Na2O;
- 0-10 mol % K2O;
- 0-8 mol % MgO;
- 0-10 mol % CaO;
- 0-5 mol % ZrO2;
- 0-1 mol % SnO2;
- and 0-1 mol % CeO2, wherein 12 mol %≦Li2O+Na2O+K2O≦20 mol % and 0 mol %≦MgO+CaO≦10 mol %, wherein the glass article is substantially free of antimony, barium, and arsenic, and wherein the glass article is ion exchangeable.
A method of making a silicate glass article, the glass article having an anneal point and a strain point, wherein the glass article has an ion exchanged surface region having a depth of at least 20 μm, the method comprising the steps of:
- a. providing a glass article, the glass article comprising:
- 60-70 mol % SiO2;
- 6-14 mol % Al2O3;
- 0-15 mol % B2O3;
- 0-2.5 mol % Li2O;
- 0-20 mol % Na2O;
- 0-10 mol % K2O;
- 0-8 mol % MgO;
- 0-10 mol % CaO;
- 0-5 mol % ZrO2;
- 0-1 mol % SnO2;
- and 0-1 mol % CeO2, wherein 12 mol %≦Li2O+Na2O+K2O≦20 mol % and 0 mol %≦MgO+CaO≦10 mol %, wherein the glass article is substantially free of antimony, barium, and arsenic;
- b. heating the glass article up to a first temperature that is greater than the anneal point of the glass article;
- c. quenching the glass article from the first temperature to a second temperature, wherein the second temperature is less than the strain point of the glass article;
- and
- d. forming an ion exchanged surface layer having a depth of at least 20 μm in the glass article.
A method of strengthening a alkali silicate glass without inducing frangibility of the glass article, the method comprising the steps of:
- a. providing a glass article, wherein the glass article has an anneal point and a strain point and comprising:
- 60-70 mol % SiO2;
- 6-14 mol % Al2O3;
- 0-15 mol % B2O3;
- 0-2.5 mol % Li2O;
- 0-20 mol % Na2O;
- 0-10 mol % K2O;
- 0-8 mol % MgO;
- 0-10 mol % CaO;
- 0-5 mol % ZrO2;
- 0-1 mol % SnO2;
- and 0-1 mol % CeO2, wherein 12 mol %≦Li2O+Na2O+K2O≦20 mol % and 0 mol % MgO+CaO≦10 mol %, wherein the glass article is substantially free of antimony, barium, and arsenic;
- b. heating the glass article to a first temperature above the anneal point of the glass, wherein heating the glass article above the anneal point increases the volume of the glass;
- c. quenching the glass article from the first temperature to a second temperature below the strain point of the glass article at a predetermined rate and
- d. exchanging a plurality of ions of a first alkali metal in the glass article with a plurality of ions second of a second alkali metal, wherein each of the plurality of ions of the second alkali metal has an ionic radius greater than that of each of the plurality of ions of the first alkali metal to create a surface compressive stress profile in the glass article.
Dependencies are inferred from the claim text.