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US 2015/0030840 A1Published application
Two-step method for strengthening glass
AssigneeCorning Incorporated
InventorsSinue Gomez, Lisa Ann Lamberson, Robert Michael Morena
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AssigneeCorning Incorporated
InventorsSinue Gomez, Lisa Ann Lamberson, Robert Michael Morena
Estimating the term…
A method of strengthening an alkali aluminoborosilicate glass. A compressive layer extending from a surface of the glass to a depth of layer is formed by exchanging larger metal cations for smaller metal cations present in the glass. In a second step, metal cations in the glass are exchanged for larger metal cations to a second depth in the glass that is less than the depth of layer and increase the compressive stress of the compressive layer. Formation of the compressive layer and replacement of cations with larger cations can be achieved by a two-step ion exchange process. An alkali aluminoborosilicate glass having a compressive layer and a crack indentation threshold of at least 3000 gf is also provided.
An alkali aluminoborosilicate glass comprising lithium cations, sodium cations, and potassium cations, wherein the glass has a surface having a compressive layer extending from the surface to a depth of layer and is enriched in potassium cations to a second depth that is less than the depth of layer, and wherein the surface of the glass has a crack initiation layer threshold of at least 6000 gf upon indentation with a Vickers indenter.
An alkali aluminoborosilicate glass comprising 50-70 mol % SiO2;
An alkali aluminoborosilicate glass comprising a surface having a compressive layer extending from the surface to a depth of layer and is enriched in potassium cations to a second depth that is less than the depth of layer, wherein the surface has a compressive stress of at least 500 MPa and the depth of layer is at least about 50 μm, and wherein the surface of the glass has a crack initiation layer threshold of at least 6000 gf upon indentation with a Vickers indenter.
Dependencies are inferred from the claim text.