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

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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.

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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

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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$38.00

[1] S. Hirano, A. Kishimoto and M. Miyayama: J. Euro. Ceram. Soc. Vol. 19 (1999), p. (2087).

[2] A.B. Fuertes, G. Marban and D.M. Nevskaia: Carbon Vol. 41 (2003), p.87.

[3] G. Leftheriotis, S. Papaefthimiou and P. Yianoulis: Solid State Ionics Vol. 136-137 (2000), p.655.

[4] Y. Yao, T. Nomura, A. Sakoda and M. Suzuki: J. Membrane Science Vol. 197 (2002), p.23.

[5] R.J. Price, J.C. Bokros and K. Koyama: Carbon Vol. 5 (1967), p.423.

[6] G.C. Wei and J.M. Robbins: Am. Ceram. Soc. Bull. Vol. 64 (1985), p.691.

[7] J.J. Healy, J.J. de Groot and J. Kerstin: Physica Vol. 82C (1976), p.392.

[8] R.I. Baxter, R.D. Rawlings, N. Iwashita and Y. Sawada: Carbon Vol. 38 (2000), p.441.

[9] T.D. Burchell and R.R. Judkins: Energy Convers. Mgmt. Vol. 38 Suppl. (1997), p. S99.

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