Method for fabricating cermets of alumina-chromium systems
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.
- Inventors:
-
- Oak Ridge, TN
- Issue Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- OSTI Identifier:
- 864656
- Patent Number(s):
- 4397963
- Assignee:
- Morgan, Chester S. (Oak Ridge, TN)
- Patent Classifications (CPCs):
-
C - CHEMISTRY C04 - CEMENTS C04B - LIME, MAGNESIA
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- method; fabricating; cermets; alumina-chromium; systems; cermet; insulators; resistant; thermal; mechanical; shock; prepared; providing; material; micron; size; solid-hydrocarbon; overcoating; slurring; effective; amount; solid; hydrocarbon; solvent; mixture; containing; thereafter; evaporating; contacting; coated; solution; chromium; precursor; compound; heating; resulting; reducing; environment; temperature; decomposition; melting; sufficient; duration; yield; particulate; essentially; dispersed; throughout; densifying; provide; characterized; theoretical; density; excess; 96; 10; vol; elemental; metal; therein; phase; boundaries; components; useful; equipment; advanced; heat; engines; nuclear-related; applications; electrical; required; heat engines; dispersed throughout; theoretical density; resulting mixture; melting temperature; effective amount; heat engine; mixture containing; dispersed phase; decomposition temperature; solvent mixture; thermal insulator; reducing environment; mechanical shock; solid hydrocarbon; micron size; sufficient duration; precursor compound; components prepared; cermet insulators; cermet insulator; alumina-chromium systems; /501/75/
Citation Formats
Morgan, Chester S. Method for fabricating cermets of alumina-chromium systems. United States: N. p., 1983.
Web.
Morgan, Chester S. Method for fabricating cermets of alumina-chromium systems. United States.
Morgan, Chester S. Sat .
"Method for fabricating cermets of alumina-chromium systems". United States. https://www.osti.gov/servlets/purl/864656.
@article{osti_864656,
title = {Method for fabricating cermets of alumina-chromium systems},
author = {Morgan, Chester S},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Jan 01 00:00:00 EST 1983},
month = {Sat Jan 01 00:00:00 EST 1983}
}