| 摘要 |
PURPOSE:To obtain the electrical conductive sialon sintered body which has high deflection strength and allows electric discharge machining by compounding specific ratios of the nitrides or silicides of Ti or Zr with a powder mixture composed of Si3N4, Al2O3, AlN poly type, sintering assistant, etc., and molding the mixture, then sintering the molding under prescribed conditions. CONSTITUTION:The Si3N4 powder, the Al2O3 powder, the AlN poly type powder (contg. AlN) and the sintering assistant (e.g.; Y2O3) are mixed. This powder mixture is added with >=1 kinds of the nitrides of the Ti and Zr at 25 to 60vol.% of the total volume and is further added with >=1 kinds of the silicides of the Ti and Zr at 0.2 to 4.6vol.% of the total volume. The resulted powder mixture is molded and the molding is held for >=1 hours at 1,600+ or -50 deg.C in an atm. pressure or pressurized gaseous nitrogen atmosphere and is then held for >=2 hours at 1,700 to 1,840 deg.C, by which the molding is sintered. The electrical conductive beta type sialon sintered body adequate for the stock for the nib of the die for drawing, etc., is thereby obtd. |
