| 摘要 |
PURPOSE:To obtain a sintered body for a tool which simultaneously has heat resistance and wear resistance by sintering mixed powder which consists of TiN and Al2O3, ZrO2 and SiC whisker, etc., at the specified rate. CONSTITUTION:Mixed powder of >=40vol.% TiN and the balance one or more kinds of Al2O3, ZrO2, AlN and SiO whisker is molded. Thereafter the molded body is pressurized and sintered at <=1600 deg.C in vacuum or the inert gas atmosphere. For example, by vol.% 60.0 TiN powder having 1.5mum mean particle diameter, 22.8 Al2O3 powder having 0.37mum mean particle diameter, 1.2 ZrO2 powder partiality stabilized by 3 mol% Y2O3 having 0.3mum mean particle diameter, 4.0 SiC whisker having 2mum mean length and 12.0 AlN powder having 0.3mum mean particle diameter are blended. This blended material is mixed by a wet method and the mixture is dried. The obtained powdery raw material is hot-pressed at 1500 deg.C in vacuum and sintered. When the blending rate of TiN is regulated to <=40vol.%, generation of chipping is not prevented and the roughness of the worked face is impaired. |
