Manufacture of carbon composites by hot pressing

Plastic and nonmetallic article shaping or treating: processes – Direct application of electrical or wave energy to work – Producing or treating inorganic material – not as pigments,...

Reexamination Certificate

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C264S029200, C264S029500, C264S029700, C264S102000, C264S258000, C264S450000, C264S451000, C264S511000, C264S512000

Reexamination Certificate

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06878331

ABSTRACT:
A mixture of carbon-containing fibers, such as mesophase or isotropic pitch fibers, a suitable matrix material, such as a milled pitch is compressed while resistively heating the mixture to form a carbonized composite material. Preferably, the carbonized material has a density of at least about 1.30 g/cm3. Preferably, the composite material is formed in less than ten minutes. This is a significantly shorter time than for conventional processes, which typically take several days and achieve a lower density material. A treating component may be impregnated into the composite. Consequently, carbon composite materials having final densities of about 1.6-1.8 g/cm3or higher are readily achieved with one or two infiltration cycles using a pitch or other carbonaceous material to fill voids in the composite and rebaking.

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SGL Carbon Company, Sigrasic Brochure, SGL Technik GmbH, (May 1999) Meitingen, Germany.

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