PURPOSE: To obtain a high-hardness sintered body for a tool with superior wear and welding resistances by mixing a specified percentage of diamond particles having a specified particle size with a specified percentage of a binder composed of hyper-fine diamond particles, carbide or the like of a specified metal and an iron group metal.
CONSTITUTION: A sintered body is manufactured using a powdered mixture consisting of 20W85vol% diamond particles having 3W10μm particle size and the balance binder. The binder is composed of 20W95vol% hyper-fine diamond particles having ≤1μm average particle size, carbide, nitride or carbonitride of a IVa, Va or VIa group transition metal in the periodic table, a solid soln. or a crystal mixture thereof having ≤1μm particle size, and an iron group metal. The powdered mixture is hot pressed at high temp. and pressure at which diamond is stable with a superhigh pressure and high temp. apparatus. The resulting signtered body shows superior wear and welding resistances.
YATSU SHIYUUJI
JP46011703A |