| 摘要 |
PURPOSE:To improve the strength of a carbon material by heat-treating, then micronizing and oxidizing hydrogenated pitch, forming the obtained self- sinterable material, carbonizing, sintering and then graphitizing the formed material. CONSTITUTION:A pitch material such as petroleum bottoms having 40-250 deg.C softening point is charged into an autoclave and catalytically hydrogenated at 350-450 deg.C in a hydrogen gas atmosphere. The hydrogenated pitch is heat- treated to control its softening point to 250-380 deg.C and then atomized at high temp. to obtain the fine particles of the self-sinterable material. The fine particles are oxidized at 180-350 deg.C in the air to adjust the relative oxidation weight increase to >=1.0 and the relative oxygen content to >=1.0, and the hydrogenation degree is recognized. The hydrogenated pitch is placed in a die and press-formed, and the formed body is fired in a carbonization furnace and then graphitized at 2000-3000 deg.C in a graphitization furnace to obtain a carbon material high in density and strength. |
