Oberflächenbeschichteter Werkzeugteil aus Hartmetall auf der Basis von Wolframcarbid.

摘要

There is disclosed a surface-coated tool member of tungsten carbide based cemented carbide which has a tungsten carbide based cemented carbide substrate and a hard coating formed on the substrate. The hard coating may have one or more layers each of which is made of one material selected from the group consisting of carbide, nitride and oxide of metals in groups IVA, VA and VIA of the Periodic Table; solid solution of said carbide, nitride and oxide; and aluminum oxide. The cobalt content of the substrate in a surface portion at a depth of about 2 mu m from a surface thereof is less than that in an interior portion at a depth of about 100 mu m from said surface by at least 10 %.