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Title: Method for fabricating cermets of alumina-chromium systems. [Patent application]

Abstract

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.

Inventors:
Issue Date:
OSTI Identifier:
5197953
Application Number:
ON: DE82016101
Assignee:
Dept. of Energy EDB-82-128120
DOE Contract Number:  
W-7405-ENG-26
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM OXIDES; FABRICATION; CERMETS; CHROMIUM ALLOYS; ELECTRICAL INSULATORS; THERMAL INSULATION; ALLOYS; ALUMINIUM COMPOUNDS; CHALCOGENIDES; COMPOSITE MATERIALS; ELECTRICAL EQUIPMENT; EQUIPMENT; MATERIALS; OXIDES; OXYGEN COMPOUNDS; 360201* - Ceramics, Cermets, & Refractories- Preparation & Fabrication

Citation Formats

Morgan, C.S. Method for fabricating cermets of alumina-chromium systems. [Patent application]. United States: N. p., 1981. Web.
Morgan, C.S. Method for fabricating cermets of alumina-chromium systems. [Patent application]. United States.
Morgan, C.S. Mon . "Method for fabricating cermets of alumina-chromium systems. [Patent application]". United States.
@article{osti_5197953,
title = {Method for fabricating cermets of alumina-chromium systems. [Patent application]},
author = {Morgan, C.S.},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1981},
month = {10}
}