| 摘要 |
PURPOSE:To obtain a carbon fiber reinforced composite material having gradation of thermal conductivity and electric conductivity in one direction which is useful for walls of a first furnace of a nuclear fusion device by using a pitch- base carbon fiber having a specified composition, structure and diameter. CONSTITUTION:In this carbon fiber reinforced carbon composite material (C/C composite material), pitch-base carbon fibers are oriented substantially in the thickness direction. The carbon fiber has such a structure that the central part of the fiber has a laminar structure of folded or bent graphite mesh planes and that the center structure is larger than the outer structure. The ratio of the thermal conductivity in the perpendicular direction to the thickness to the thermal conductivity in the thickness direction exceeds 2, and the thermal conductivity in the thickness direction is >=7W/cm. deg.C. It is preferable that the pitch-base carbon fibers have >=15mum diameter. A metal substrate 3 substantially perpendicular to the thickness direction of the C/C composite material is joined with a brazing material 4 to the opposite surface of the composite body 2 to the plasma facing plane 6. Thus, wall of a first furnace disposed facing to plasma in a nuclear fusion device is obtd. |
