STARTING POWDER FOR CARBONACEOUS MATERIAL OF HIGH DENSITY AND HIGH STRENGTH AND PRODUCTION OF CARBONACEOUS MATERIAL

摘要

PURPOSE:To prepare a carbonaceous powder for producing carbonaceous material of high density and high strength which has good moldability, can be readily carbonized and graphitized with extremely increased carbonization yield and can be completely fired in a shortened time, attains sufficiently high density and high strength with only single firing in no need of any binder because of its excellent self-welding properties. CONSTITUTION:A condensed polycyclic hydrocarbon or a substance containing the same is polymerized in the presence of a superstrong acid (hydrogen fluoride)-boron trifluoride to prepare a meso-phase pitch. Then, the product is heat-treated in an oxidative atmosphere to give a starting powder for high- density and high strength carbon aceous material containing more than 78wt.% of the fraction insoluble in pyridine and 5.0 to 20.0wt.% of the fraction soluble in pyridine but insoluble in benzene. The powder is molded by compression and fired to give the objective carbonaceous material.