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Highly thermal conductive sintered SiC fiber-reinforced 3D SiC/SiC composites; Experiments and finite-element analysis of the thermal diffusivity/conductivity

高熱伝導性焼結SiC繊維強化3DSiC/SiC複合材料; 熱拡散率/熱伝導率の実験と有限要素解析

山田 禮司; 井川 直樹 ; 田口 富嗣; 實川 資朗

Yamada, Reiji; Igawa, Naoki; Taguchi, Tomitsugu; Jitsukawa, Shiro

SiC繊維強化SiC/SiC複合材料(SiC/SiC)は、核融合炉の先進的ブランケット構造材料と目されている。構造設計の点から、最大熱応力を設計強度以内に抑えるため、材料には高熱伝導性が要求されている。最近開発された焼結SiC繊維は高熱伝導率を有しており、それを用いたSiC/SiC複合材料もまた高熱伝導性を示すことが期待される。ここでは、CVIとPIP法により焼結SiC繊維を用いて複合化し、それらの熱伝導率を評価した。その結果、CVI及びPIPによる複合材では、室温でそれぞれ、60W/mK,25W/mKの値をえた。これらの値は、非焼結SiC繊維の複合材の熱伝導率と比較すると、非常に大きく開発材料の有望性を示している。焼結及び非焼結SiC繊維のSiC/SiC複合材の熱伝導解析を有限要素法で行い、実験結果を裏付ける計算結果を得た。

SiC fiber-reinforced SiC composites (SiC/SiC) are considered an advanced structural material for blanket modules of a fusion reactor, which requires high thermal conductivity in order to keep thermal stresses in the material lower than the allowable design stress. The sintered SiC fiber recently developed has obtained high thermal conductivity, so it is highly expected that sintered SiC fiber-reinforced SiC/SiC composites would also show high thermal conductivity. In this study several types of 3D SiC/SiC composites were fabricated by either CVI or PIP method. The results of the thermal conductivity measurements show that the maximum thermal conductivity at room temperature was about 60 W/mK for CVI composites or 25W/mK for PIP ones. These values are considerably higher than those of non-sintered SiC fiber reinforced SiC/SiC composites, which indicates a possibility that the developed materials would be promising. The FEM thremal analysis shows the good agreement between the caluculated and experimental results.

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パーセンタイル:77.82

分野:Materials Science, Multidisciplinary

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