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Title: 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:
 [1]
  1. (Oak Ridge, TN)
Issue Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
OSTI Identifier:
864656
Patent Number(s):
4397963
Assignee:
Morgan, Chester S. (Oak Ridge, TN) ORNL
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 = {1983},
month = {1}
}

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