C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
25/128, 31/190
C22C 29/12 (2006.01) C04B 35/111 (2006.01) C04B 35/71 (2006.01)
Patent
CA 1188503
Abstract of the Disclosure Cermet insulators resistant to thermal and mechanical shock are prepared from alumina-chromium systems by providing an Al2O3 material of about 0.5 to 7.0 micron size with d solid-hydrocarbon overcoating by slurring an effective amount of said solid hydrocarbon in a solvent mixture containing said Al2O3 and thereafter evaporating said solvent, contacting said coated Al2O3 with a solution of chromium precursor com- pound, heating the resulting mixture in a reducing environment to a temperature above the decomposition temperature of said chromium pre- cursor compound but less than the melting temperature of the Al2O3 or chromium for sufficient duration to yield d particulate compound having chromium essentially dispersed throughout the Al2O3, and then den- sifying 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 Al2O3 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.
412390
Meredith & Finlayson
The Government Of The United States As Represented By The United
LandOfFree
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