| abstract |
A carbon fiber reinforcing material having an appropriate thermal conductivity and capable of increasing the carbon fiber content in a molded body with a thermoplastic resin is provided. A short fiber having an average fiber diameter of 5 to 15 μm made of pitch-based carbon fibers, a fiber diameter distribution ratio to the fiber diameter of 5 to 15%, an average fiber length of 10 to 100 μm, and an aspect ratio of 1 to 20. Weight of A and the short fiber B having an average fiber diameter of 5 to 15 μm made of pitch-based carbon fibers, a fiber diameter distribution ratio to the fiber diameter of 5 to 15%, and an average fiber length of 0.1 to 1 mm A carbon fiber aggregate obtained by mixing at a ratio of 1:99 to 99: 1, wherein the crystallite size derived from the growth direction of the hexagonal network surface of the carbon fiber aggregate is 10 nm or more. A carbon fiber reinforced composite material obtained by impregnating a pitch-based carbon fiber assembly with a thermoplastic resin. [Selection figure] None |