核融合炉用プラズマ対向材料としての炭化ホウ素-炭素繊維複合セラミックスの開発(第1報) : 製作とその材料特性

概要

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New materials for plasma facing component such as divertor and the first wall armors in thermonuclear fusion were studied. The materials were fabricated by hot-pressing aggregates of unidimensionally oriented carbon fibers(CF)impregnated with boron carbide(B_4C)powder. The relation between density, thermal properties and sintering temperature of B_4C simple materials, bonding state between B_4C and CF interface by sintering, and the effect of CF volume and sintering temperature on microstructure, thermal and mechanical properties of B_4C/CF composite ceramics, were investigated in this study. As a result ; Sintered body with high density over 95 percent was obtained, when sintered at 2100℃ regardless of the CF content. Sintered body with thermal conductivity more than 150W/m・K was obtained when the sintering temperature was 2100℃ and it contained more than 65 percent CF, and bending strength of the sintered body was over 500 MPa and 20 to 30 MPa for directions perpendicular and parallel to CF, respectively.
社団法人日本セラミックス協会の論文
1997-10-01