| 摘要 |
PURPOSE:To obtain the title compound material having appropriate porosity, high mechanical strength, heat resistance, chemical resistance, and abrasion resistance by press-molding a specified carbonaceous raw material consisting of short fiber-shaped carbon fiber and pitch, and carbonizing the molded body. CONSTITUTION:A raw material for carbon material consisting of 60-90wt.% short fiber-shaped carbon fiber having 2.5-32mu fiber diameter and 30mu-2mm fiber length, and 40-10wt.% pitch having >=220 deg.C softening point and being crushed to 60-200 mesh is press-molded at a temp. in the range by 5-100 deg.C lower than the softening point of the pitch under 80-400kg/cm<2> pressure. Further, the obtd. molded body is carbonized in inert atmosphere under atmospheric pressure, and graphitized if necessary. Thus, an aimed compound body having 25-65% porosity is obtd. Suitable carbon fiber to be used is one generating scarce difference of dimensional change to that of a precursor for matrix carbon in the stage of carbonization and graphitization. Pitch base carbon fiber, particularly that obtd. from optically anisotropic pitch is more preferably than carbon fiber from PAN synthetic fiber as raw material. |
