Sumitomo Electric Industries, Limited

Sumitomo Electric Hardmetal Corp.

Sumitomo Electric Sintered Alloy, Ltd.

Kosuke Tominaga

Anongsack Paseuth

Fumiyoshi Kobayashi

Yasuki Kido

Tomoyuki Ishimine

Haruko Harada

Shigeki Egashira

Takayuki Tashiro

A cutting tool is a cutting tool including: a base; and a coating disposed on the base, wherein the coating includes a first layer, wherein the first layer is composed of α-AlO, a thickness of the first layer is 2 μm or more and 15 μm or less, on a cross section along a normal line of an interface between the base and the coating, a ratio N2/N1 is 0.60 or more, and on the cross section along the normal line of the interface between the base and the coating, a ratio N4/N3 and the ratio N2/N1 satisfy a relationship of a Formula 1.

Cutting tool

A sintered material includes a composition composed of iron-based alloy, and a texture containing 200 or more and 1350 or less of compound particles having a size of 0.3 μm or more per unit area of 100 μm×100 μm in a cross section, and a relative density is 93% or more.

Sintered material and method of manufacturing sintered material

A cutting tool includes a substrate and a coated film arranged on the substrate. The coated film includes a first layer. The first layer includes a plurality of crystal grains. The crystal grains are composed of AlTiCN, wherein x is more than 0.65 and less than 0.95, and y is not less than 0 and less than 0.1. In a first region, the crystal grains have an average aspect ratio of not more than 3.0. In a second region, the crystal grains have an average aspect ratio of more than 3.0 and not more than 10.0. The crystal grains include crystal grains having a cubic crystal structure. The first layer has a ratio of an area occupied by the crystal grains having a cubic crystal structure of not less than 90%. The first layer has a thickness of not less than 2 &#x3bc;m and not more than 20 &#x3bc;m.

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Osaka, Japan

Kosuke Tominaga