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Title: Liquid phase sintering of silicon carbide

Abstract

Liquid phase sintering is used to densify silicon carbide based ceramics using a compound comprising a rare earth oxide and aluminum oxide to form liquids at temperatures in excess of 1600.degree. C. The resulting sintered ceramic body has a density greater than 95% of its theoretical density and hardness in excess of 23 GPa. Boron and carbon are not needed to promote densification and silicon carbide powder with an average particle size of greater than one micron can be densified via the liquid phase process. The sintered ceramic bodies made by the present invention are fine grained and have secondary phases resulting from the liquid phase.

Inventors:
 [1];  [2];  [2]
  1. (Bountiful, UT)
  2. (Salt Lake City, UT)
Issue Date:
Research Org.:
Cerametic Inc
OSTI Identifier:
866956
Patent Number(s):
4829027
Assignee:
Ceramatec, Inc. (Salt Lake City, UT) OAK
DOE Contract Number:  
AC03-84ER80191
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
liquid; phase; sintering; silicon; carbide; densify; based; ceramics; compound; comprising; rare; earth; oxide; aluminum; form; liquids; temperatures; excess; 1600; degree; resulting; sintered; ceramic; density; 95; theoretical; hardness; 23; gpa; boron; carbon; promote; densification; powder; average; particle; size; micron; densified; via; process; bodies; fine; grained; secondary; phases; based ceramics; phase sintering; fine grained; theoretical density; earth oxide; carbide powder; aluminum oxide; liquid phase; rare earth; silicon carbide; particle size; sintered ceramic; compound comprising; ceramic bodies; average particle; phase process; fine grain; based ceramic; /501/264/

Citation Formats

Cutler, Raymond A., Virkar, Anil V., and Hurford, Andrew C. Liquid phase sintering of silicon carbide. United States: N. p., 1989. Web.
Cutler, Raymond A., Virkar, Anil V., & Hurford, Andrew C. Liquid phase sintering of silicon carbide. United States.
Cutler, Raymond A., Virkar, Anil V., and Hurford, Andrew C. Sun . "Liquid phase sintering of silicon carbide". United States. https://www.osti.gov/servlets/purl/866956.
@article{osti_866956,
title = {Liquid phase sintering of silicon carbide},
author = {Cutler, Raymond A. and Virkar, Anil V. and Hurford, Andrew C.},
abstractNote = {Liquid phase sintering is used to densify silicon carbide based ceramics using a compound comprising a rare earth oxide and aluminum oxide to form liquids at temperatures in excess of 1600.degree. C. The resulting sintered ceramic body has a density greater than 95% of its theoretical density and hardness in excess of 23 GPa. Boron and carbon are not needed to promote densification and silicon carbide powder with an average particle size of greater than one micron can be densified via the liquid phase process. The sintered ceramic bodies made by the present invention are fine grained and have secondary phases resulting from the liquid phase.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1989},
month = {1}
}

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