Thermal Conductivity of Mullite-Zirconia Composites

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  • KYAW Than Min
    Department of Chemistry and Materials Technology, Kyoto Institute of Technology
  • OKAMOTO Yasunori
    Department of Chemistry and Materials Technology, Kyoto Institute of Technology
  • HAYASHI Kunio
    Department of Chemistry and Materials Technology, Kyoto Institute of Technology

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  • ムライトージルコニア複合セラミックスの熱伝導率
  • ムライト ジルコニア フクゴウ セラミックス ノ ネツ デンドウリツ エイブン

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Abstract

Thermal conductivity of mullite-zirconia composites was measured. Since the thermal conductivity of zirconia is smaller than that of mullite, the conductivity of composites gradually decreased with the addition of zirconia up to 30vol% into mullite, which is consistent with the results estimated from the Eucken's equation. However, it was remarkably lowered with the further additions and the minimum value, 3.26W·m-1·K-1, was attained at about 50vol% of zirconia fraction. In the ZrO2-rich composites, on the other hand, a small decrease in conductivity compared to that of ZrO2 was found in spite of the addition of higher conductive mullite. It has been supposed that the reaction occurred between yttria stabilizer and silica and/or alumina from mullite during sintering and it resulted in the formation of a glassy phase at the grain boundaries, which was responsible for the decrease in thermal conductivity.

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