Method for fabricating cermets of alumina-chromium systems. [Patent application]
Cermet insulators resistant to thermal and mechanical shock are prepared from alumina-chromium systems in the following way: 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 slurrying 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.
- DOE Contract Number:
- W-7405-ENG-26
- Assignee:
- Dept. of Energy
- Patent Number(s):
- None
- Application Number:
- ON: DE82016101
- OSTI ID:
- 5197953
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
ALLOYS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CERMETS
CHALCOGENIDES
CHROMIUM ALLOYS
COMPOSITE MATERIALS
ELECTRICAL EQUIPMENT
ELECTRICAL INSULATORS
EQUIPMENT
FABRICATION
MATERIALS
OXIDES
OXYGEN COMPOUNDS
THERMAL INSULATION