Mitsubishi Materials Corporation

Mitsubishi Metal Corporation

Hitoshi Kunugi

Toshiaki Ueda

Tetsuhiko Honma

Yoshio Hirakawa

Keiichi Sakurai

Hironori Yoshimura

Akihiro Murakami

Yoshihiro Sawada

In the surface-coated cutting tool, a Ti compound layer containing at least nitrogen and carbon is formed on a surface of cutting tool substrate, a nitrogen concentration in the Ti compound layer, in a case of being measured in a direction perpendicular to the surface of the cutting tool substrate in a vicinity of a cutting edge, gradually increases as a distance from cutting tool substrate increases within a range of 0.20 &#x3bc;m from the surface of the cutting tool substrate toward the Ti compound layer, an average concentration gradient of the nitrogen concentration is 20 at %/&#x3bc;m or more and 300 at %/&#x3bc;m or less, and an average nitrogen concentration in the Ti compound layer in the vicinity of the cutting edge is lower than an average nitrogen concentration in the Ti compound layer at a position of a flank face away from the cutting edge by 3 at % or more.

Surface-coated cutting tool with excellent adhesion-induced chipping resistance and peel resistance

Coated cemented carbide cutting tool member and process for producing the same

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 IV.sub.A, V.sub.A and VI.sub.A 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%.

Surface-coated tool member of tungsten carbide based cemented carbide

Growing community of inventors

Ibaraki-ken, Japan

Hitoshi Kunugi