| 摘要 |
PURPOSE:To obtain a ceramic material having excellent heat-resistance, abrasion resistance, thermal shock resistance and toughness by using a mixture of titanium hydride, titanium carbide and/or aluminum hydroxide and cubic boron nitride each having respective specific particle diameter as raw material powder, producing a green compact from the powder and baking the compact in two stages. CONSTITUTION:A raw material powder composed of 0.5-20wt.% of titanium hydride powder having an average particle diameter of <1mum, 5-40wt.% of titanium carbide powder and/or aluminum oxide powder having an average particle diameter of 1-5mum and the remaining part of a cubic boron nitride (abbreviated as C-BN) having an average particle diameter of 1-10mum is mixed, formed into a green compact and heated at 1200-1500 deg.C in vacuum to react a part of C-BN with the total of titanium hydride. Titanium nitride and titanium boride are formed by this reaction of obtain a porous C-BN-based sintered ceramic material containing C-BN as a component for forming a dispersed phase and titanium carbide and/or aluminum oxide bonded through the above produced titanium nitride or titanium boride. The sintered material is treated at a high temperature under ultrahigh pressure by conventional process to attain a density corresponding to >=98% of the theoretical density. |
