Refractory celsian glass-ceramics

Details Refractory celsian glass-ceramics Refractory celsian glass-ceramics

1974-07-26

1976-04-27

Bashore, S. Leon

Compositions: coating or plastic

Coating or plastic compositions

Marking

65 33, 106 396, C03C 322, C03B 3200

Patent

active

039532208

ABSTRACT:
The present invention is concerned with the production of glass-ceramic articles wherein the crystal phase consists essentially of celsian (BaO.Al.sub.2 O.sub.3.2SiO.sub.2) with a minor amount of rutile (TiO.sub.2). Such articles consist essentially, by weight, of about 20-40% SiO.sub.2, 20-35% Al.sub.2 O.sub.3, 20-35% BaO, 5-15% PbO and/or 2-15% P.sub.2 O.sub.5, and 7-12% TiO.sub.2. Such articles can have a use temperature up to about 1250.degree.C, exhibit a coefficient of thermal expansion (room temperature to 900.degree.C) between about 35-50 .times. 10.sup.-.sup.7 /.degree.C, may demonstrate modulus of rupture values in excess of 20,000 psi, and will have a high density (about 3.1-3.5 g/cc), thereby recommending their utility as heat transfer media in a process such as that devised for extracting oil from oil-containing shale.

REFERENCES:
patent: 3201266 (1965-08-01), MacDowell
patent: 3578470 (1971-05-01), Bahat et al.
patent: 3700471 (1972-10-01), Duke
patent: 3804608 (1974-04-01), Gaskell

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