| 摘要 |
There are disclosed graphitized vapor-grown carbon fibers capable of forming composite materials having the graphitized vapor-grown carbon fibers contained at a high packing density and forming molded members consisting substantially solely of the graphitized vapor-grown carbon fibers, a process for the preparation of the graphitized vapor-grown carbon fibers, the molded member, and the composite member. The graphitized vapor-grown carbon fibers have a mean fiber diameter of 5 mu m or smaller, a mean fiber length of 90 mu m or shorter, a mean aspect ratio of from 1 to 18, and a electronic spin density of 8 x 10<1><8> spins/g or less, when measured by the electron spin resonance absorption method. Such graphitized vapor-grown carbon fibers are prepared by graphitizing the vapor-grown carbon fibers at 2,000 DEG C or higher and then fracturing them by applying a high impact thereto. The molded members can be formed, for example, by hydrostatic pressure-isotropic pressure molding techniques. The composite members can be prepared by compounding the vapor-grown and graphitized carbon fibers with the matrix. |
