| 摘要 |
PURPOSE:Carbonaceous pitch is melt-extruded into fibers, which are made infusible by treating them in a specific oxidative gas atmosphere, and heat-treated in an inert atmosphere whereby the time required for the roasting process is extremely shortened. CONSTITUTION:Pitch fibers resulting from melt-extrusion of carbonaceous pitch are heat-treated in an oxidative gas atmosphere containing 0.1-50vol% of NO2 to be converted into infusible fibers containing 0.1-5.0wt% of nitrogen. Then, the resultant infusible fibers are heat-treated in an inert gas atmosphere at a 2,000-3,000 deg.C, after the temperature is raised at a rate of more than 40 deg.C/min, to give the pitch graphite fibers.
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