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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 fig.
Inventors:
; ;
Issue Date:
OSTI Identifier:
264577
Assignee:
Martin Marietta Energy Systems, Inc., Oak Ridge, TN (United States) PTO; SCA: 320303; 360000; PA: EDB-96:120298; SN: 96001625923
Patent Number(s):
US 5,536,292/A/
Application Number:
PAN: 8-518,067
Contract Number:
AC05-84OR21400
Resource Relation:
Other Information: PBD: 16 Jul 1996
Research Org:
Lockheed Martin Energy Syst Inc
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 36 MATERIALS SCIENCE; MATERIALS; SINTERING; FURNACES; THERMAL INSULATION; FABRICATION; MICROWAVE HEATING; SINTERED MATERIALS

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