Manufacture of carbon/carbon composites by hot pressing

a carbon/carbon composite and hot pressing technology, applied in the field of carbon/carbon composite manufacturing, can solve the problems of increasing weight, increasing cost, and increasing complexity of carbon/carbon composites, and achieves fewer densification and carbonization cycles and less processing steps
US20050003037A1Inactive Publication Date: 2005-01-06GRAFTECH INT HLDG INC
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
GRAFTECH INT HLDG INC
Publication Date
2005-01-06
Estimated Expiration
Not applicable · inactive patent

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Abstract

A mixture of carbon-containing fibers, such as mesophase or isotropic pitch fibers, and a suitable matrix material, such as a milled pitch, is compressed while resistively heating the mixture to form a carbonized composite material having a density of about 1.5 g / cm3, or higher. The composite material is formed in under ten minutes. This is a significantly shorter time than for conventional processes, which typically take several days and achieve a lower density material. Consequently, carbon / carbon composite materials having final densities of about 1.6-1.8 g / cm3, or 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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Description

[0001] This divisional application claims benefit of co-pending U.S. patent application Ser. No. 10 / 205,859 filed Jul. 26, 2002, entitled “Manufacture of Carbon / Carbon Composites by Hot Pressing” which is hereby incorporated by reference.BACKGROUND OF THE INVENTION

[0002] 1. Field of the Invention

[0003] The present application relates to a method for forming carbon / carbon composites suited for use as friction-bearing and structural materials for high temperature applications. It finds particular application in conjunction with a composite material formed by resistance heating of carbon fiber / binder mixtures during application of a compressive force and will be described with particular reference thereto. It should be appreciated that the method has application in other areas where the combined effects of pressure and temperature are desired.

[0004] 2. Discussion of the Art

[0005] Carbon / carbon composites include those structures formed from a fiber reinforcement, which itself consi...

Claims

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