Study on Si Dependence of RB-SiC Thermoelectric Properties

Abstract:

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The effects of free silicon on thermoelectric properties of reaction-bounded silicon carbide (RB-SiC) were studied. RB-SiC ceramic consists of some free silicon after reaction sintering. Some RB-SiC samples were reheated at high temperature in vacuum to adjust silicon content. The results showed that free silicon affects thermoelectric properties remarkably, especially for the thermoelectric power. A surprising phenomenon was found in SiC/Si composite consisting ~20wt% free-Si, i.e., thermoelectric power, figure of merit Z and ZT are all sharply increased above 400oC. The peak value (4.2X10-4) of ZT appears in original SiC/Si composite at about 500oC, which is increased more than 1000 times than that at room temperature.

Info:

Periodical:

Key Engineering Materials (Volumes 280-283)

Edited by:

Wei Pan, Jianghong Gong, Chang-Chun Ge and Jing-Feng Li

Pages:

401-404

DOI:

10.4028/www.scientific.net/KEM.280-283.401

Citation:

G. J. Qiao et al., "Study on Si Dependence of RB-SiC Thermoelectric Properties", Key Engineering Materials, Vols. 280-283, pp. 401-404, 2005

Online since:

February 2007

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Price:

$35.00

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