Method of making strengthened transparent glass-ceramic, partial

Details Method of making strengthened transparent glass-ceramic, partial Method of making strengthened transparent glass-ceramic, partial

1981-01-09

1982-07-27

Fisher, Richard V.

Glass manufacturing

Processes

With chemically reactive treatment of glass preform

65 33, C03B 3200, C03C 322

Patent

active

043415431

ABSTRACT:
This invention is directed to means for producing strengthened, transparent glass-ceramic, partially body-crystallized, and surface-crystallized glass articles wherein beta-quartz solid solution constitutes the predominant crystal phase. The inventive method comprises subjecting a glass article consisting essentially, expressed in terms of weight percent, of about 2.5-6% Li.sub.2 O, 0.5-5% RO, wherein RO consists of ZnO and the alkaline earth metal oxides BaO, CaO, MgO, and SrO, 16-25% Al.sub.2 O.sub.3, 64-73% SiO.sub.2, and 3.0-6% RO.sub.2, wherein RO.sub.2 consists of 0-6% TiO.sub.2 and 0-3.5% ZrO.sub.2, to vapors of SO.sub.2 and thereafter heat treating the glass article to cause crystallization in situ thereof.

REFERENCES:
patent: 1973501 (1934-09-01), Murgatroyd
patent: 3451796 (1969-06-01), Mochel
patent: 3677785 (1972-07-01), Horikawa
patent: 4042362 (1977-08-01), MacDowell et al.

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