| abstract |
[PROBLEMS] To develop a carbon fiber reinforced material having extremely high thermal conductivity as a whole molding material and excellent mechanical properties. SOLUTION: A pitch-based carbon fiber A having an average diameter of 1 to 20 μm, a fiber length of 1 to 100 μm, and an aspect ratio of 1 to 100, a fiber average diameter of 2 to 40 μm, and an average fiber length of 0. A carbon fiber assembly obtained by mixing carbon fibers B of 1 to 150 mm so that the weight ratio of fibers A to fibers B is 1 to 99 to 99 to 1, and the carbon fibers The crystallite size of the pitch-based carbon fiber A in the aggregate in the hexagonal network growth direction is 5 nm or more, the carbon fiber aggregate has a thickness of 0.05 to 5 mm, and a porosity of 50 to 95. A carbon fiber aggregate obtained by molding a cluster containing pitch-based carbon fibers in volume% into a flat shape. [Selection figure] None |