Thermal and Electrical Conductivities of Porous Carbon-Coated Ceramic Fiber Composites

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Porous ceramic fiber composites were coated with pyrolytic carbon by the decomposition of infiltrated phenolic resin in a nitrogen atmosphere at 800. The amount of carbon coating was varied to tailor the electrical conductivity of the carbon-coated composites. The electrical and thermal conductivity of the composites were measured at room temperature using a two-point method and a hot-wire one, respectively. Up to 30 wt% pyrolytic carbon, the electrical conductivity σ shows linearly increasing tendency and is fitted by the effective conductivity according to the parallel rule of a mixture σeff = ΣΧi ·σi with an effective conductivity of pyrolytic carbon σc= 0.42 S/cm. The thermal conductivity of the coated composites is in the range 0.05-0.08 W/mK and increases with carbon content.

Info:

Periodical:

Key Engineering Materials (Volumes 317-318)

Edited by:

T. Ohji, T. Sekino and K. Niihara

Pages:

491-494

DOI:

10.4028/www.scientific.net/KEM.317-318.491

Citation:

J. C. Lee et al., "Thermal and Electrical Conductivities of Porous Carbon-Coated Ceramic Fiber Composites", Key Engineering Materials, Vols. 317-318, pp. 491-494, 2006

Online since:

August 2006

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Price:

$35.00

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