COATING OF HIGH WEAR RESISTANCE AND HIGH HARDNESS EXCELLING IN RESISTANCE TO HIGH TEMPERATURE OXIDATION AND, PROVIDED THEREWITH, TOOL OR METAL MOLD OF GEAR CUTTING MACHINE TOOL

摘要

A coating of high wear resistance and high hardness exhibiting resistance to oxidation at 1000°C or higher. In particular, a coating of high wear resistance and high hardness excelling in resistance to high temperature oxidation is obtained through a process comprising disposing a substrate of SKH-51 in an ark ion plating apparatus and forming coating (a) of Al, Cr and Si nitrides on a surface of the substrate by ark ion plating.