DIAMOND GRANULAR BODY CONTAINING NITROGEN AND BORON HAVING CONDUCTIVITY AND FLUIDIZED-BED ELECTRODE USING THE DIAMOND GRANULAR BODY

摘要

PPROBLEM TO BE SOLVED: To provide a diamond granular body that has conductivity by containing nitrogen and boron and a fluidized bed electrode using the same. PSOLUTION: Each powder is mixed with a mixing ratio of 0.5-15 wt%, preferably 0.5-10 wt% of boron compound powder, 76-98.9 wt%, preferably 81-98.8 wt% of easily-graphitizable carbon powder, and 1-9 wt% of artificial graphite powder. This mixture is mixed for one minute to two hours by a mixer such as a V-shaped mixer and a ball mill. The mixture is molded by a means such as an extrusion molding, a cold isotropic pressure molding method, and a hot molding so as to become any shape and size, and calcined (first calcining) in the non-oxidizing atmosphere at temperatures of 600C-1,300C. After the first calcining, the mixture is calcined (second calcining) in the inert gas atmosphere at a temperature of 1,800C-2,200C, preferably 1,900C-2,100C. Then, it is heat treated in the non-oxidizing atmosphere at a temperature of 2,400C-2,600C and graphitization is further increased and the impurities are sublimated, and a graphite of high impurity is obtained. PCOPYRIGHT: (C)2004,JPO