Method of making crystallized glass

Details Method of making crystallized glass Method of making crystallized glass

1974-08-26

1976-02-17

Bashore, S. Leon

Glass manufacturing

Processes

Devitrifying glass or vitrifying crystalline glass

106 397, C03B 2900

Patent

active

039389782

ABSTRACT:
Crystallized glass has hitherto been made by the use of the mineral petalite as the source of lithium values. Petalite is in short supply, and when attempts are made to use lithium carbonate or a similar lithium salt in place of petalite in the glass batch, unwanted microcracking develops during a subsequent crystallizing heat treatment with certain glass compositions. Such microcracking can be avoided by using a purposefully small addition to the petalite-free batch of an alkali metal salt, wherein the alkali metal is selected from the class consisting of potassium, rubidium and cesium.

REFERENCES:
patent: 3489577 (1970-01-01), Tashiro et al
patent: 3834911 (1974-09-01), Hammel
patent: 3846099 (1974-11-01), Simmons
patent: 3854919 (1974-12-01), Pirooz
patent: 3856497 (1974-12-01), Hummel

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