Liquid phase sintering of silicon carbide

Patent · Sun Jan 01 00:00:00 EST 1989

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

Related Subjects

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/