ムライトージルコニア複合セラミックスの熱伝導率

概要

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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 30 vol% into mullite, which is consistent with the results estixnated from the Eucken's equation. However, it was remarkably lowered with the further additions and the minimum value, 3.26 W m^<-1> K^<-1>, was attained at about 50 vol% of zirconia fraction. In the Zr0_2 rich composites, on the other hand, a small decrease in conductivity compared to that of Zr0_2 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.
社団法人日本セラミックス協会の論文
1995-12-01