Glass-ceramics containing cristobalite and potassium fluorrichte

Details Glass-ceramics containing cristobalite and potassium fluorrichte Glass-ceramics containing cristobalite and potassium fluorrichte

1985-11-04

1986-08-26

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Devitrified glass-ceramics

501 57, C03C 1016, C03C 3112

Patent

active

046083480

ABSTRACT:
This invention is directed to the production of glass-ceramic articles exhibiting great toughness, a modulus of rupture of at least 20,000 psi, and, in the form of bars having dimensions 5".times.0.5".times.0.1", sagging during the crystallization heat treatment of no more than 0.2" over a 4" span, and wherein potassium fluorrichterite constitutes the predominant crystal phase but wherein cristobalite is also present in an amount of at least 10% by volume. The inventive articles having an overall composition consisting essentially, in weight percent on the oxide basis, of:

REFERENCES:
patent: 4467039 (1984-08-01), Beall et al.

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