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

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

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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:: Morgan, C.S.

Issue Date:: 1981-10-05

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

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                    Morgan, C.S. Method for fabricating cermets of alumina-chromium systems. [Patent application].  United States: N. p., 1981. 
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                    Morgan, C.S. Method for fabricating cermets of alumina-chromium systems. [Patent application].  United States.

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                    Morgan, C.S. Mon .  
        "Method for fabricating cermets of alumina-chromium systems. [Patent application]".  United States.

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@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}

}

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