Mitsubishi Materials Corporation

Masaki Okude

Kenji Yamaguchi

Akihiro Murakami

Shin Nishida

Akira Osada

A surface-coated cutting tool according to the present invention includes a tool body and a hard coating layer including a complex carbonitride layer containing a small amount of chlorine and (TiZrHf)(NC) (0.10&#x2264;x&#x2264;0.90, 0&#x3c;y&#x2264;1.0, 0.08&#x3c;z&#x3c;0.60), a ZrHf and C content ratios in cycles, a cycle distance between a maximum ZrHf content point and an adjacent minimum ZrHf content point and a cycle distance between a maximum C content point and an adjacent minimum C content point are 5 to 100 nm, an average value of content ratio differences &#x394;x and &#x394;z is 0.02 or more, a distance between the maximum ZrHf content point and the maximum C content point is &#x2155; or less of the distance between a maximum content point and a minimum content point of adjacent ZrHf components, and a composition fluctuation structure is 10% or more.

Surface-coated cutting tool in which hard coating layer exhibits exceptional welding resistance, plastic deformation resistance, and anomalous damage resistance

A surface-coated cutting tool in which a hard coating layer exhibits exceptional adhesion resistance and anomalous damage resistance is provided. This surface-coated cutting tool includes a tool body composed of a WC based cemented carbide or a TiCN based cermet; and at least one hard coating layer provided on a surface of the tool body, and; 1) the hard coating layer includes at least one complex nitride layer, 2) the complex nitride layer contains 0.001 to 0.030 atom % of chlorine, 3) in the complex nitride layer, an area ratio of longitudinal crystal grains having an aspect ratio equal to or greater than 2 occupying a longitudinal cross section is 50% or more, and 4) a layer thickness of the complex nitride layer is 0.2 &#x3bc;m to 20 &#x3bc;m.

Surface-coated cutting tool in which hard coating layer exhibits exceptional adhesion resistance and anomalous damage resistance

In a surface-coated cutting tool, a hard coating layer composed of a lower layer and an upper layer is deposited on a surface of a tool body made of a WC-based cemented carbide or a TiCN-based cermet. The lower layer has at least one Ti compound layer made of a TiCN layer and the upper layer is made of an &#x3b1;-type AlOlayer. In a case where, regarding AlOcrystal grains of the entire upper layer, a constituent atom-sharing lattice point distribution is measured, a highest peak is present in &#x3a3;3, and a distribution ratio of &#x3a3;3 is 70% or more. A ratio of a &#x3a3;3-coincidence grain boundary continuing from an interface between the lower layer and the upper layer to an outermost surface of the upper layer is 60% or more of a &#x3a3;3-coincidence grain boundary of the upper layer.

Surface-coated cutting tool

A surface-coated cutting tool of the invention is a surface-coated cutting tool in which a surface of a tool body is coated with a lower layer and an upper layer, in which at least one layer of the lower layer is made of a TiCN layer, the upper layer has an average layer thickness of 2 to 15 &#x3bc;m and is made of an AlOlayer having an &#x3b1;-type crystal structure in a chemically deposited state, and in a coincidence grain boundary distribution graph, a highest peak is present in &#x3a3;3 in the range of &#x3a3;3 to &#x3a3;29, a distribution ratio of &#x3a3;3 occupies 35 to 70% of the whole coincidence grain boundary length of &#x3a3;3 or more, and a coincidence grain boundary of &#x3a3;31 or more occupies 25 to 60% of the whole coincidence grain boundary length of &#x3a3;3 or more.

Surface coating cutting tool

A surface-coated cutting tool includes a lower layer including a Ti compound layer, an intermediate layer including an &#x3b1;-AlOlayer, and an upper layer including a Zr-containing &#x3b1;-AlOlayer. The outermost layer of the lower layer contains 0.5 to 3 at % of oxygen. The frequencies of inclination angles between a normal line to a (0001) plane of AlOgrains of the intermediate layer and a normal line to a surface of a tool body have a highest peak in an inclination angle division of 0 to 10&#xb0;. The ratio of the frequencies is 50 to 70%. The frequencies between the normal line to the (0001) plane of AlOgrains of the entirety of the intermediate and the upper layers and the normal line to the tool body surface have a highest peak in an inclination angle division of 0 to 10&#xb0;. The ratio of the frequencies is 75% or more.

Growing community of inventors

Naka-gun, Japan

Masaki Okude