| 摘要 |
PURPOSE:To obtain an isotropic graphite material having a specific resistance adjusted to a high level without reducing a degree of graphitization by mixing graphite powder with coke powder, kneading the mixture with a tar pitch binder, molding by rubber-pressing after pulverizing the kneaded product, then calcining and graphitizing. CONSTITUTION:A raw material filler is prepd. by mixing graphite powder with coke powder (pref. in 20-50wt.% graphite powder), and the filler is kneaded with a tar pitch binder (200 deg.C, 5-8hr). If dinitro naphthalene is added to the mixture in this case, increase of specific resistance is prompted (suitable amt. to the raw material filler is 5-7wt.%, and suitable kneading temp. is <=200 deg.C). Molding powder is prepd. by cooling and pulverizing the kneaded product (suitable means particle size of the pulverized product is <=100mum). The powder is filled in a rubber case, deaerated by evacuation, then press-molded in a hydrostatic press (under 1000kg/cm<2>). Obtd. press-molded product is carbonized at 1000 deg.C, then graphitized at 2500 deg.C. The value of the specific resistance may be desirably adjusted within a range from 12 to 25X10<-4> ohm.cm by controlling the proportion of the graphite powder. |
