TANSOSENIFUKUGOTAIOYOBISONOSEIZOHOHO

摘要

High porosity carbon fiber composite materials are produced by pressure impregnating mat form products of pitch based carbon fibers having a bulk density of 0.001 - 0.3 g/cm<3> with matrix components so as to give impregnated sheet form products containing 25 - 95 weight % of matrix components and subjecting to heating treatment at a pressure lower than the impregnation pressure under such a condition that an apparent volume of the said sheet form products is increased by 1.2 times or greater.