| 摘要 |
<P>PROBLEM TO BE SOLVED: To create a fiber-reinforced composite material in which carbon fibers are randomly oriented so as to reduce unevenness in mechanical property, and which has excellent mechanical characteristics and a high fiber volume content, by forming a carbon fiber sheet comprising carbon fibers randomly oriented as single fibers and having high apparent density, and reliably impregnating a resin into the sheet. <P>SOLUTION: The fiber-reinforced composite material comprises carbon fibers and a resin, wherein the carbon fibers are randomly oriented as single fibers and constitute a sheet having apparent density of 0.25-1.5 g/cm<SP POS="POST">3</SP>, the sum of the percentages of COO groups and C-O groups in C1s peak measured by ESCA in the carbon fiber surfaces of the sheet surface is ≥5%, and the fiber volume content of the carbon fibers is 20-80%. <P>COPYRIGHT: (C)2013,JPO&INPIT |
