Glass sheets with improved mechanical strength
AssigneeCorning Incorporated
InventorsDana Craig Bookbinder, Keith Leonard House, Pushkar Tandon
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Abstract
Transparent glass sheets having increased mechanical strength include an inner layer surrounded by surface compressive layers wherein the difference of the coefficient of thermal expansion of the inner layer and the surface compressive layer is greater than 50×10−7° C.−1 and wherein the surface compressive layer has a compressive stress of at least about 300 MPa.
Claims24
A transparent glass sheet comprising a surface compressive layer and an inner layer adjacent to the surface compressive layer,
- wherein between 0° C. and 300° C. a difference between a coefficient of thermal expansion of the inner layer and a coefficient of thermal expansion of the surface compressive layer is greater than 50×10−7° C.−1, and
- wherein the surface compressive layer has a compressive stress of at least about 300 MPa and the inner layer has a tensile stress of at least 29 MPa.
A transparent glass sheet comprising a surface compressive layer and an inner layer adjacent to the surface compressive layer, wherein between 0° C. and 300° C. the difference between the coefficient of thermal expansion of the inner layer and the coefficient of thermal expansion of the surface compressive layer is greater than 50×10−7° C.−1, the surface compressive layer has a compressive stress of at least about 300 MPa, and a ratio of a thickness of the inner layer to a thickness of the transparent glass sheet is less than or equal to 0.9.
Dependencies are inferred from the claim text.