DIE MADE FROM HARD METAL HAVING LUBRICATIVE AMORPHOUS-CARBON-BASED SURFACE COATING WHICH SHOWS EXCELLENT WEAR RESISTANCE IN HIGH-SPEED PRESS FORMING FOR METAL POWDER

摘要

PROBLEM TO BE SOLVED: To provide a die made from a hard metal having a lubricative amorphous-carbon-based surface film which shows excellent wear resistance in high-speed press forming for a metallic powder.;SOLUTION: The die comprises: a main body of the die made from a tungsten-carbide-based hard metal or a titanium-carbonitride-based cermet; a bonding layer of a titanium nitride layer and/or a titanium carbonitride layer with an average layer thickness of 0.1 to 3 μm, which is formed on at least a forming face of the main body, in a magnetic field of a magnetron sputtering apparatus; and the lubricative amorphous-carbon-based surface film formed on the surface of a bonding layer, in a reactive atmosphere formed of a decomposed gas of hydrocarbon and a mixed gas of nitrogen and argon, and in a magnetic field, while using a tungsten carbide target and a Ti target. The formed film comprises 10-40 atom% W, 0.5-4 atom% Ti, 10-30 atom% N and the balance carbon with unavoidable impurities; shows a structure in which fine grains of a crystalline titanium-carbonitride-based compound are dispersed in the base material of a carbon-based amorphous body, when observed with a transmission electron microscope; and has an average layer thickness of 1 to 13 μm.;COPYRIGHT: (C)2006,JPO&NCIPI