Liquid phase sintering of silicon carbide

Patent · Sat Dec 31 23:00:00 EST 1988

OSTI ID:866956

Cutler, Raymond A ^[1]; Virkar, Anil V ^[2]; Hurford, Andrew C ^[2]

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1. Bountiful, UT
2. Salt Lake City, UT

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.

• Research Organization: Cerametic Inc
• DOE Contract Number: AC03-84ER80191
• Assignee: Ceramatec, Inc. (Salt Lake City, UT)
• Patent Number(s): US 4829027
• OSTI ID: 866956
• Country of Publication: United States
• Language: English

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