Glasses, thermally stable high (beta)-cristobalite glass-ceramic

Details Glasses, thermally stable high (beta)-cristobalite glass-ceramic Glasses, thermally stable high (beta)-cristobalite glass-ceramic

1976-10-22

1977-09-27

Douglas, Winston A.

Compositions: coating or plastic

Coating or plastic compositions

Marking

106 52, C03C 322, C03C 304

Patent

active

040509460

ABSTRACT:
Thermally stable high (beta)-cristobalite glass-ceramics suitable for making articles such as refractory linings for ovens, furnaces, and the like and which do not undergo transition to the low (alpha)-cristobalite crystal phases upon cooling of the ceramic to ambient temperature. A method for making such stable ceramics by melting a glass of the composition MO. Al.sub.2 O.sub.3.nSiO.sub.2 wherein the Al.sub.2 O.sub.3 MO molar ratio is 1, MO is CaO or a mixture of CaO and MxO where Mx is a cation of the first, second or fourth group of the Periodic Table or iron and n is a positive number of from 8 to 37, and subjecting the glass to a heat schedule sufficient to form a stabilized high (beta)-cristobalite type crystal structure in the resulting glass-ceramic, with or without a portion of low cristobalite and/or feldspar crystals.

REFERENCES:
patent: 2920971 (1960-01-01), Stookey
patent: 3445252 (1969-05-01), MacDowell

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