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Title: Method of preparing thermal insulation for high temperature microwave sintering operations

Superior microwave transparent thermal insulations for high temperature microwave sintering operations were prepared. One embodiment of the thermal insulation comprises granules of boron nitride coated with a very thin layer of glassy carbon made by preparing a glassy carbon precursor and blending it with boron nitride powder to form a mixture. The blended mixture is granulated to form a grit which is dried and heated to form the granules of boron nitride coated with a glassy carbon. Alternatively, grains of glassy carbon are coated with boron nitride by blending a mixture of a slurry comprising boron nitride, boric acid binder, and methyl alcohol with glassy carbon grains to form a blended mixture. The blended mixture is dried to form grains of glassy carbon coated with boron nitride. In addition, a physical mixture of boron nitride powder and glassy carbon grains has also been shown to be an excellent thermal insulation material for microwave processing and sintering.
 [1];  [2];  [3]
  1. (Knoxville, TN)
  2. (Oak Ridge, TN)
  3. (Kingston, TN)
Issue Date:
OSTI Identifier:
Martin Marietta Energy Systems, Inc. (Oak Ridge, TN) ORNL
Patent Number(s):
US 5536292
Contract Number:
Research Org:
Country of Publication:
United States
method; preparing; thermal; insulation; temperature; microwave; sintering; operations; superior; transparent; insulations; prepared; embodiment; comprises; granules; boron; nitride; coated; layer; glassy; carbon; precursor; blending; powder; form; mixture; blended; granulated; grit; dried; heated; alternatively; grains; slurry; comprising; boric; acid; binder; methyl; alcohol; addition; physical; shown; excellent; material; processing; carbon coated; nitride coated; blended mixture; comprising boron; physical mixture; slurry comprising; nitride powder; microwave sintering; thermal insulation; boric acid; boron nitride; glassy carbon; carbon precursor; microwave transparent; thermal insulations; acid binder; sintering operations; microwave processing; excellent thermal; transparent thermal; temperature microwave; insulation material; superior microwave; microwave process; /65/252/501/