Strengthened glass article and method

Details Strengthened glass article and method Strengthened glass article and method

C - Chemistry, Metallurgy

03

C

49/92

C03C 10/12 (2006.01) C03C 10/00 (2006.01)

Patent

CA 1322277

Abstract of the Disclosure There is disclosed a lithium aluminosilicate glass body encased within, and integral with, a thin, compressive, semicrystalline layer containing beta-eucryptite and/or beta-quartz solid solution crystals, and a method of producing such body. The layer has a substantially lower thermal coefficient of expansion than the glass, but has the same chemical composition as the glass. That composition, in percent by weight on a calculated oxide basis is 55-67% SiO2, 5.0-7.5% Li20, 22-28% A1203, 0-2% Na2O and 0-10% ZnO, the molar ratio of R20+R0 to A1203 being greater than one. Controlled crystallization procedure is described whereby the crystallized layer can be produced in a relatively short time.

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