生コークスを用いた炭素/セラミックス複合材料の製造(第9報) : C/SiC/B_4C複合材の材料物性

概要

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Mechanical and thermal properties of the C/SiC/B_4C composites made by a normal pressure sintering process were examined as a function of SiC and B4_C content. The composites showed an increase in bending strength due to dispersions of the particles, which was more markedly than that of the composites made by hot press method. The increase in mechanical strength was due to not interactions between cracks and dispersed particles but an increase in Young's modulus of the composites. The thermal expansion coefficient decreased with an increase of SiC and B4_C content, which showed the same feature in temperature dependence as conventional carbon bodies, that is, the slopes of the increases became small at around 400℃. The particle dispersions of SiC and B_4C im proved the thermal conductivity at room temperatures. Thermal shock fracture resistance, R and R', showed the maximum values when the SiC and B_4C content was around 30 vol%
社団法人日本セラミックス協会の論文
1994-10-01