Application of SiC-Si FGM to Thermoelectric Energy Conversion Device

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  • SiC-Si FGMの熱電変換素子への応用
  • SiC Si FGM ノ ネツデン ヘンカン ソシ エ ノ オウヨウ

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Abstract

SiC ceramics are promising candidate materials for high temperature operating devices application such as thermoelectric energy converters, because of the high chemical stability. However, the electrical conductivity of the SiC ceramics is too low to apply to the thermoelectric energy converter at low temperature. Therefore, we propose a SiC-Si functionally gradient material (FGM) in order to improve the electrical conductivity of the SiC ceramics at low temperature. <br>SiC rod was fired in the temperature gradient furnace. One edge of SiC rod was kept at 2473K and another edge was kept at 1973K for 0.5h. After firing, the porous SiC edge which was fired at 1973K was dipped into molten Si in order to impregnate porous SiC with Si. The microstructure of the FGM is classified into three region, that is densified SiC ceramics, porous SiC ceramics and SiC-Si composite materials. The electrical conductivity, thermal conductivity and Seebeck coefficient for each part of SiC-Si FGM were measured and the figure of merit was calculated. The figure of merit of cooling edge of the SiC-Si FGM, at room temperature, was 108 times higher than that of SiC ceramics.

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