Al.sub.2 O.sub.3 /B.sub.4 C/SiC composite
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United States of America Patent
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Nov 17, 1992
Grant Date -
N/A
app pub date -
Mar 21, 1991
filing date -
Mar 21, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The processes of the invention involve the formation of an initial reactant mixture by combining sources of SiO.sub.2, B.sub.2 O.sub.3, aluminum, and carbon. The mixture may then optionally be shaped or compacted. The reactant mixture is then heated to start a reaction which is described by the formula: 4 C+3 SiO.sub.2 +2 B.sub.2 O.sub.3 +8 Al.fwdarw.4 Al.sub.2 O.sub.3 +B.sub.4 C+3 SiC. Depending on the actual reactant mixture compositions and reaction conditions, other reactions may also occur.
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