Process for making carbon fiber

Abstract

Abstract Carbon fibers made by a process which involves heating a polyacrylonitrile fiber to a temperature below its carbonization temperature in an oxidizing atmosphere, carbonizing the fibers in a nonoxidizing atmosphere, such that combined heat and tension is applied to the fiber during at least one of the above steps, and then heating the carbon fibers in an inert atmosphere for at least one hour at from 1,300*-1,800* C., are improved by subjecting the carbon fibers to a post-heat treatment in an inert atmosphere at elevated temperatures of about 2,300*-3,000* C. for a very short time of 30-90 seconds.

Inventors

• 👤 B Roberts

Bibliographic Details