Strengthened glass article and method

Details Strengthened glass article and method Strengthened glass article and method

1987-04-01

1989-03-21

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Devitrified glass-ceramics

501 4, 501 5, 501 32, 501 68, 501 69, C03C 1012, C03C 1004, C03C 1400

Patent

active

048142972

ABSTRACT:
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% SiO.sub.2, 5.0-7.5% Li.sub.2 O, 22-28% Al.sub.2 O.sub.3, 0-2% Na.sub.2 O and 0-10% ZnO, the molar ratio of R.sub.2 O+RO to Al.sub.2 O.sub.3 being greater than one. Controlled crystallization procedure is described whereby the crystallized layer can be produced in a relatively short time.

REFERENCES:
patent: 2998675 (1961-09-01), Olcott et al.
patent: 3006775 (1961-10-01), Chen
patent: 3253975 (1966-05-01), Olcott et al.
patent: 3779856 (1973-12-01), Pirovz
patent: 3938978 (1976-02-01), Hummel
patent: 4022627 (1977-05-01), Tashiro et al.
patent: 4057434 (1977-11-01), Rittler

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