| 摘要 |
PURPOSE:To obtain raw material powder having a high density and good electric-discharge machinability by finely pulverizing a product satisfied with a specific condition originated from the double bonds of C and O in IR absorption spectrum among the products produced by thermally treating a carbonaceous raw material and having a prescribed volatile content. CONSTITUTION:A carbonaceous raw material is thermally treated into products having a volatile content of 3-20wt.%, an average particle size of 15-20mum and a toluene soluble content of 1-10wt.%. The product satisfied with one or more of four conditions originated from the stretching oscillation of the double bonds of C and O in IR absorption spectrum among the thermal products is finely pulverized. As the four conditions, a ratio between the peak of an IR absorption spectrum originated from C=0 at a place near to 1700cm<-1> based on 1790cm<-1> and 1665cm<-1> and the peak of an IR absorption spectrum originated from C=C at a place near to 1600cm<-1> based on 1665cm<-1> and 1540cm<-1> is set to <=0.25. The changing rate from the carbonaceous raw material to a thermal treatment product in the peak ratio is set to <=4 as the other condition. |
