Plastic and nonmetallic article shaping or treating: processes – Carbonizing to form article – In specific atmosphere
Patent
1994-11-07
1999-11-02
Fiorilla, Christopher A.
Plastic and nonmetallic article shaping or treating: processes
Carbonizing to form article
In specific atmosphere
264 297, C01B 3100
Patent
active
059764295
ABSTRACT:
A dense, self-sintered silicon carbide/carbon-graphite composite material and a process for producing the composite material. The composite material includes a silicon carbide matrix, between 2 and 30 percent by weight carbon-graphite, and small amounts of sintering aids such as boron and free carbon. The silicon carbide has an average grain size between 2 and 15 .mu.m, and the carbon-graphite has an average grain size between 10 and 75 .mu.m, the average grain size of the carbon-graphite being greater than the average grain size of the silicon carbide. The composite material has a density of at least 80 percent of theoretical density as determined by the rule of mixtures for a composite material. This density is achieved with minimal microcracking at a high graphite loading with large graphite particles. The composite material exhibits good lubricity and wear characteristics, resulting in improved tribological performance. The process for producing the composite material uses a carbon-bonded graphite including at least 5 percent by weight carbon-precursor binder.
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Chen Xin E.
Pfaff Mark E.
Fiorilla Christopher A.
Gray Bruce D.
Russell Dean W.
The Morgan Crucible Company plc
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