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

Abstract:

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Porous ceramic fiber composites were coated with pyrolytic carbon by the decomposition of propane in a nitrogen atmosphere at 900°C. The amount of carbon coating was varied through adjusting deposition time 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 method, respectively. Up to 7 wt% pyrolytic carbon, the electrical conductivity σ is linearly increased to 0.02 S/cm and well fitted by the effective conductivity according to the parallel rule of a mixture σ eff = Σ Χ i ·σ i with a conductivity of pyrolytic carbon σ c= 20 S/cm .The thermal conductivity of the uncoated and coated composites is in the range 0.065-0.075 W/mK and little affected by carbon coating presumably owing to the small amount of coated carbon in this work.

Info:

Periodical:

Materials Science Forum (Volumes 486-487)

Edited by:

Hyung Sun Kim, Sang-Yeop Park, Bo Young Hur and Soo Wohn Lee

Pages:

370-373

DOI:

10.4028/www.scientific.net/MSF.486-487.370

Citation:

J. S. Yu et al., "Electrical and Thermal Properties of Carbon-Coated Porous Ceramic Fiber Composites", Materials Science Forum, Vols. 486-487, pp. 370-373, 2005

Online since:

June 2005

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Price:

$35.00

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