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Title: Thermal insulation for high temperature microwave sintering operations and method thereof

Abstract

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.

Inventors:
 [1];  [2];  [3]
+ Show Inventor Affiliations
  1. Knoxville, TN
  2. Oak Ridge, TN
  3. Kingston, TN
Issue Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
OSTI Identifier:
870064
Patent Number(s):
5449887
Assignee:
Martin Marietta Energy Systems, Inc. (Oak Ridge, TN)
Patent Classifications (CPCs):
H - ELECTRICITY H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR H05B - ELECTRIC HEATING
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DOE Contract Number:  
AC05-84OR21400
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
thermal; insulation; temperature; microwave; sintering; operations; method; superior; transparent; insulations; prepared; embodiment; comprises; granules; boron; nitride; coated; layer; glassy; carbon; preparing; 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; /219/264/

Citation Formats

Holcombe, Cressie E, Dykes, Norman L, and Morrow, Marvin S. Thermal insulation for high temperature microwave sintering operations and method thereof. United States: N. p., 1995. Web.
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Holcombe, Cressie E, Dykes, Norman L, & Morrow, Marvin S. Thermal insulation for high temperature microwave sintering operations and method thereof. United States.
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Holcombe, Cressie E, Dykes, Norman L, and Morrow, Marvin S. Sun . "Thermal insulation for high temperature microwave sintering operations and method thereof". United States. https://www.osti.gov/servlets/purl/870064.
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@article{osti_870064,
title = {Thermal insulation for high temperature microwave sintering operations and method thereof},
author = {Holcombe, Cressie E and Dykes, Norman L and Morrow, Marvin S},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1995},
month = {1}
}
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Works referenced in this record:

Single-Crystal Diffraction Patterns from Vitreous Carbon
journal, October 1974

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