Compositions: ceramic – Ceramic compositions – Refractory
Patent
1981-10-05
1983-08-09
Bell, Mark
Compositions: ceramic
Ceramic compositions
Refractory
75 05BC, 75235, 501153, C04B 3510
Patent
active
043979637
ABSTRACT:
Cermet insulators resistant to thermal and mechanical shock are prepared from alumina-chromium systems by providing an Al.sub.2 O.sub.3 material of about 0.5 to 7.0 micron size with a solid-hydrocarbon overcoating by slurring an effective amount of said solid hydrocarbon in a solvent mixture containing said Al.sub.2 O.sub.3 and thereafter evaporating said solvent, contacting said coated Al.sub.2 O.sub.3 with a solution of chromium precursor compound, heating the resulting mixture in a reducing environment to a temperature above the decomposition temperature of said chromium precursor compound but less than the melting temperature of the Al.sub.2 O.sub.3 or chromium for sufficient duration to yield a particulate compound having chromium essentially dispersed throughout the Al.sub.2 O.sub.3, and then densifying said particulate to provide said cermet characterized by a theoretical density in excess of 96% and having 0.1 to 10.0 vol.% elemental chromium metal present therein as a dispersed phase at the boundaries of the Al.sub.2 O.sub.3 material. Cermet components prepared thereby are useful in high temperature equipment, advanced heat engines, and nuclear-related equipment applications where electrical or thermal insulators are required.
REFERENCES:
patent: 4124737 (1978-11-01), Wolfa et al.
patent: 4126654 (1978-11-01), Montgomery et al.
patent: 4234338 (1980-11-01), Morgan et al.
Bell Mark
Besha Richard G.
Carter C. Clay
Hamel Stephen D.
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