METHOD FOR MANUFACTURING ISOTROPIC GRAPHITE MATERIAL HAVING HIGH COEFFICIENT OF THERMAL EXPANSION AND GRAPHITE TOOL AND GRAPHITE BASE MATERIAL EACH CONSISTING OF THE ISOTROPIC GRAPHITE MATERIAL

摘要

PROBLEM TO BE SOLVED: To provide a method for manufacturing a dense isotropic graphite material having high strength and a high coefficient of thermal expansion and to provide a graphite tool and to obtain a graphite base material consisting of the isotropic graphite material.;SOLUTION: In the method for manufacturing an isotropic graphite material including a kneading process, isotropic forming process and carbonizing and graphitizing process, the kneading process is carried out by compounding crude cokes having 5 to 15 wt.% volatile matter and 4 to 20 μm average particle size with hard pitch having 70 to 90 mass% fixed carbon, 10 to 30 wt.% volatile content, 20 to 30 μm average particle size and ≥200°C softening point by 100:(40 to 250) compounding ratio by weight, and further by adding 5 to 60 pts.wt. tar to 100 pts.wt. of the crude cokes to knead the compound. Prior to pulverizing the obtained kneaded material, the kneaded material is heat treated in an inert atmosphere at 300°C to 400°C to remove the volatile matter in the tar by ≥30 wt.%.;COPYRIGHT: (C)2002,JPO