PRODUCTION OF PITCH-BASED CARBON FIBER AND GRAPHITE FIBER

摘要

PURPOSE:To improve the threading yield of precarbonized fiber, reduce the fusing and sticking degree, shorten the precarbonization time and efficiently obtain the subject fiber of high quality by subjecting an infusibilized fiber bundle to precarbonization treatment according to a specific method. CONSTITUTION:A spun and collected pitch fiber bundle is initially infusibilized. The resultant infusibilized fiber bundle is then heat-treated in an oxidizing gas-containing atmosphere at 500-700 deg.C, preferably 550-650 deg.C maximum temperature in a short time, preferably 50-200sec, precarbonized and subsequently carbonized. The aforementioned carbonized fiber, as necessary, is further graphitized. Furthermore, oxygen or air is preferred as the oxidizing gas used for the precarbonization and the oxygen content in the oxidizing gas-containing atmosphere is preferably 0.05-10%.