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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 1,600 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. 4 figs.

Inventors:
; ;
Issue Date:
Research Org.:
Cerametic Inc
OSTI Identifier:
7167676
Patent Number(s):
4829027 A
Application Number:
PPN: US 7-185370
Assignee:
Ceramatec, Inc., Salt Lake City, UT (United States) OAK; EDB-94-116498
DOE Contract Number:  
AC03-84ER80191
Resource Type:
Patent
Resource Relation:
Patent File Date: 21 Apr 1988
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; SILICON CARBIDES; SINTERING; COMPACTING; DENSITY; GRAIN SIZE; HARDNESS; CARBIDES; CARBON COMPOUNDS; FABRICATION; MECHANICAL PROPERTIES; MICROSTRUCTURE; PHYSICAL PROPERTIES; SILICON COMPOUNDS; SIZE; 360201* - Ceramics, Cermets, & Refractories- Preparation & Fabrication

Citation Formats

Cutler, R.A., Virkar, A.V., and Hurford, A.C. Liquid phase sintering of silicon carbide. United States: N. p., 1989. Web.
Cutler, R.A., Virkar, A.V., & Hurford, A.C. Liquid phase sintering of silicon carbide. United States.
Cutler, R.A., Virkar, A.V., and Hurford, A.C. Tue . "Liquid phase sintering of silicon carbide". United States.
@article{osti_7167676,
title = {Liquid phase sintering of silicon carbide},
author = {Cutler, R.A. and Virkar, A.V. and Hurford, A.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 1,600 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. 4 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1989},
month = {5}
}