Plastic and nonmetallic article shaping or treating: processes – Carbonizing to form article – Controlling varying temperature or plural heating steps
Patent
1995-06-02
1998-01-13
Czaja, Donald E.
Plastic and nonmetallic article shaping or treating: processes
Carbonizing to form article
Controlling varying temperature or plural heating steps
264 291, 264 296, 264 44, 264 60, 427228, 4273835, 4273936, 501 90, 501 99, C01B 3100
Patent
active
057075670
ABSTRACT:
A self-sintered silicon carbide/carbon-graphite composite material having interconnected pores which may be impregnated, and a raw batch and process for producing the composite material, is provided. The composite material comprises a densified, self-sintered matrix of silicon carbide, carbon-graphite inclusions and small amounts of any residual sintering aids, such as boron and free carbon, and has interconnected pores which may be impregnated with resin, carbon, TEFLON, (polyetrafluoroethylene) metal or other compounds or materials selected for their particular properties to achieve desired tribological characteristics for a specific application. The composite material is produced from a raw batch which includes silicon carbide, sintering aids, a temporary filler and coated graphite particles. The raw batch is then molded/shaped into a green body and heated to carbonize any carbonizable materials and to decompose and volatilize the organic filler to form a matrix of interconnected pores. The green body is pressureless sintered to densify the matrix. The interconnected pores may then be impregnated with a resin, carbon, metal, TEFLON, (polytetrafluoroethylene) compound or other material selected for desired tribological characteristics.
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Colaianni Michael Philip
Czaja Donald E.
Gray Bruce D.
The Morgan Crucible Company plc
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