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Title: Refractory ceramic compositions and method for preparing same

This invention relates to ceramic compositions of tungsten and tantalum oxides including 0 to 33 1/3 mole percent of a metal oxide such as hafnia. These ceramics are characterized by melting points greater than about 1400.degree.C and selectively controlled coefficients of thermal expansion of essentially zero to a negative value in the temperature range of 20.degree. to 1000.degree.C.
Inventors:
 [1];  [2]
  1. (Knoxville, TN)
  2. (Oak Ridge, TN)
Issue Date:
OSTI Identifier:
862589
Assignee:
United States of America as represented by United States Energy (Washington, DC) ORNL
Patent Number(s):
US 3969123
Contract Number:
W-7405-ENG-26
Research Org:
UNION CARBIDE CORP
Country of Publication:
United States
Language:
English
Subject:
refractory; ceramic; compositions; method; preparing; relates; tungsten; tantalum; oxides; including; 33; mole; percent; metal; oxide; hafnia; ceramics; characterized; melting; 1400; degree; selectively; controlled; coefficients; thermal; expansion; essentially; zero; negative; value; temperature; range; 20; 1000; ceramic composition; temperature range; thermal expansion; metal oxide; mole percent; ceramic compositions; refractory ceramic; selectively controlled; selectively control; tantalum oxide; /501/