Compositions: ceramic – Ceramic compositions – Carbide or oxycarbide containing
Patent
1995-06-02
1997-08-12
Bell, Mark L.
Compositions: ceramic
Ceramic compositions
Carbide or oxycarbide containing
501 89, 501 91, 501 99, 428446, 428689, 428698, C04B 35565
Patent
active
056565631
ABSTRACT:
A dense, self-sintered silicon carbide/carbon-graphite composite material and a process for producing the composite material is disclosed. The composite material comprises 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 comprising at least 5 percent by weight carbon-precursor binder.
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"5.2.
Chen Xin E.
Pfaff Mark E.
Bell Mark L.
Gray Bruce D.
Mall Michael
Russell Dean W.
The Morgan Crucible Company plc
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