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Effects of rare-earth oxide and alumina additives on thermal conductivity of liquid-phase-sintered silicon carbide

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Abstract

SiC ceramics were prepared from a β–SiC powder doped with two different sintering additives—a mixture of La2O3 and Y2O3 and a mixture of Al2O3 and Y2O3—by hot pressing and annealing. Their microstructures, phase compositions, lattice oxygen contents, and thermal conductivities were evaluated. The SiC doped with rare-earth oxides attained thermal conductivities in excess of 200 W/(m K); however, the SiC doped with additives containing alumina had thermal conductivities lower than 71 W/(m K). The high thermal conductivity of the rare-earth-oxide-doped SiC was attributed to the low oxygen content in SiC lattice, high SiC–SiC contiguity, and lack of β– to α–SiC polytypic transformation. The low thermal conductivity of the alumina-doped SiC was attributed to the point defects resulting from the dissolution of Al2O3 into SiC lattice and the occurrence of polytypic transformation.

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Authors and Affiliations

  1. Synergy Materials Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Nagoya, 463–8687, Japan

    You Zhou, Kiyoshi Hirao, Yukihiko Yamauchi & Shuzo Kanzaki

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  1. You Zhou
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  2. Kiyoshi Hirao
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  3. Yukihiko Yamauchi
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  4. Shuzo Kanzaki
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Zhou, Y., Hirao, K., Yamauchi, Y. et al. Effects of rare-earth oxide and alumina additives on thermal conductivity of liquid-phase-sintered silicon carbide. Journal of Materials Research 18, 1854–1862 (2003). https://doi.org/10.1557/JMR.2003.0259

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  • DOI: https://doi.org/10.1557/JMR.2003.0259

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