| 摘要 |
PURPOSE:To obtain the titled pin which is soft, superior in wear resistance and easy for machining, by covering TiC or TiN on surface of sintered body in which specified ratios of carbides, etc. of metal in IVa, Va, VIa groups are added to tetragonal crystal ZrO2. CONSTITUTION:Mixture composed of 10-25vol% at least one kind among carbide, nitride, boride of metal in IVa, Va, VIa groups and solid soln. thereof, and the balance tetragonal crystal ZrO2 powder is formed, and sintered in nonoxidizing atmosphere. Fine powder contg. 2-5mol% Y2O3 obtd. by coprecipitation method, etc. is used for ZrO2. Next, said sintered body is further hot pressed hydrostatically to high strength material, it is finished to a necessary size by discharge machining, then covering layer of TiO or TiN having <10mu thickness is formed at least one part of the surface by known CVD method, etc. |
