Vapor-grown and graphitized carbon fibers, process for preparing

Details Vapor-grown and graphitized carbon fibers, process for preparing Vapor-grown and graphitized carbon fibers, process for preparing

1993-07-06

1995-04-25

Ryan, Patrick J.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Rod, strand, filament or fiber

428359, 4234471, 4234473, 4234476, B32B 900

Patent

active

054097754

ABSTRACT:
There are disclosed vapor-grown and graphitized carbon fibers capable of forming composite materials having the vapor-grown and graphitized carbon fibers contained at a high packing density and forming molded members consisting substantially solely of the vapor-grown and graphitized carbon fibers, a process for the preparation of the vapor-grown and graphitized carbon fibers, the molded member, and the composite member. The vapor-grown and graphitized 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 spin density of 8.times.10.sup.18 spins/g or less, when measured by the electron spin resonance absorption method. Such vapor-grown graphitized carbon fibers are prepared by graphitizing the vapor-grown carbon fibers at 2,000.degree. 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.

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patent: 5210116 (1993-05-01), Hashimoto et al.
American Institute of Physics, "Electron-spin-resonance studies of vapor-grown carbon fibers", Journal of Applied Physics, vol. 62, No. 9, pp. 3947-3952, Nov. 1, 1987.

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