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US 8,561,429 B2Granted
Glass with compressive surface for consumer applications
AssigneeCorning Incorporated
InventorsDouglas Clippinger Allan, Adam James Ellison, Sinue Gomez
Life of this patent
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Abstract
A strengthened glass that does not exhibit frangible behavior when subjected to impact or contact forces, and a method of strengthening a glass. The glass may be strengthened by subjecting it to multiple, successive, ion exchange treatments. The multiple ion exchange treatments provide a local compressive stress maximum at a depth of the strengthened layer and a second local maximum at or near (e.g., within 10 μm) the surface of the glass.
Claims13
A method of strengthening a glass, the method comprising the steps of:
- a. providing the glass, the glass having a surface;
- and
- b. successively immersing at least a portion of the glass in a plurality of ion exchange baths, the ion exchange baths comprising a first ion exchange bath, the first ion exchange bath comprising a first metal, and a second ion exchange bath, the second ion exchange bath comprising a metal that is different from the first metal, to create a compressive stress in an outer region to strengthen the glass, the outer region extending from the surface to a depth of layer, wherein the compressive stress creates an integrated central tension of less than or equal to about 3.2 MPa·cm in a central tensile region of the glass, wherein each of the plurality of ion exchange baths are at a temperature in a range from about 410° C. to about 430° C.
Dependencies are inferred from the claim text.