| CPC B23B 27/148 (2013.01) [C23C 14/0641 (2013.01); B23B 2228/10 (2013.01); C23C 14/34 (2013.01)] | 4 Claims |
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1. A coated cutting tool comprising a hard coating on a surface of a flank face, wherein the hard coating is a nitride of Al, Cr, and Si in which Al is 50 atom % or more, Cr is 30 atom % or more, and Si is 1 atom % or more and 5 atom % or less with respect to a total amount of metal elements including metalloid elements, and Ar is 0.02 atom % or less with respect to the total amount of metal elements including metalloid elements and non-metal elements,
in a case where a total amount of the metal elements including metalloid elements, nitrogen, oxygen, carbon, and Ar is set to 100 atom %, an atomic ratio A of a total amount of the metal elements including metalloid elements and an atomic ratio B of nitrogen in the hard coating satisfy a relationship of 1.02≤B/A≤1.10,
in an intensity profile of a selected-area diffraction pattern using X-ray diffraction or a transmission electron microscope, a diffraction peak originating from a (111) plane of a face-centered cubic lattice structure exhibits a maximum intensity,
in a cross-sectional observation of the hard coating, the number of droplets having an equivalent circle diameter of 3 μm or more is less than 1 per 100 μm2, and
a surface of the hard coating formed on the flank face has an arithmetical mean curvature Spc value at a peak point, as defined by ISO25178, of 5000 or less.
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