Sumitomo Electric Hardmetal Corp.

Yuki Tsutsumiuchi

Satoru Kukino

Hironari Moroguchi

Akihiko Ueda

Nozomi Tsukihara

A cutting tool comprises a substrate and a coating film disposed on the substrate, wherein the coating film comprises a first layer and a second layer; the first layer has a hardness Hof 25 GPa or more and 40 GPa or less; the second layer has a hardness Hsatisfying 0.5×H≤H≤0.9×H; and at least one of a ratio I/(I+I+I) of Iof (200) plane to a sum of X-ray diffraction intensity Iof (200) plane, X-ray diffraction intensity Iof (111) plane, and X-ray diffraction intensity Iof (220) plane of the coating film, a ratio I/(I+I+I) of Ito the sum, and a ratio I/(I+I+I) of Ito the sum is 0.45 or more.

Cutting tool

A cutting tool comprising a substrate and a coating film disposed on the substrate, wherein the coating film comprises a first layer; the first layer has a thickness of 0.2 &#x3bc;m or more and 9 &#x3bc;m or less; the first layer is composed of TiAlMN, wherein M is at least one element such as zirconium; in the first layer, x and y change along the thickness direction of the first layer; a maximum value of x, x, is 0.20 or more and 0.70 or less; a minimum value of x, x, is 0 or more and 0.6 or less; xand xsatisfy 0.01&#x2264;x&#x2212;x&#x2264;0.7; a maximum value of y, y, is 0.01 or more and 0.20 or less; a minimum value of y, y, is 0 or more and 0.19 or less; and yand ysatisfy 0.01&#x2264;y&#x2212;y&#x2264;0.2.

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Itami, Japan

Yuki Tsutsumiuchi