| CPC B23B 27/14 (2013.01) [B23B 2228/105 (2013.01); B23B 2228/36 (2013.01)] | 8 Claims |
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1. A cutting tool, comprising a substrate and a coating disposed on the substrate,
wherein the coating comprises a first layer,
the first layer consists of multiple hard particles,
the hard particles consist of titanium, silicon, carbon, and nitrogen,
the hard particles have a cubic crystal structure,
the first layer has a columnar structure,
in the first layer, an average of a ratio of the number of atoms of the silicon NSi to a sum of the number of atoms of the titanium NTi and the number of atoms of the silicon NSi, NSi/(NTi+NSi), is 0.01 or more and 0.10 or less,
in the first layer, an average of a ratio of the number of atoms of the carbon NC to a sum of the number of atoms of the carbon NC and the number of atoms of the nitrogen NN, NC/(NC+NN), is 0.60 or more and 0.85 or less,
the hard particles have a stacked structure in which first unit layers and second unit layers are stacked alternately,
the first unit layers and the second unit layers each consist of titanium, silicon, carbon, and nitrogen,
a ratio of the number of atoms of the silicon to a sum of the number of atoms of the titanium and the number of atoms of the silicon in the first unit layers, x1, is higher than a ratio of the number of atoms of the silicon to a sum of the number of atoms of the titanium and the number of atoms of the silicon in the second unit layers, x2, and
a ratio of the number of atoms of the carbon to a sum of the number of atoms of the carbon and the number of atoms of the nitrogen in the first unit layers, y1, is higher than a ratio of the number of atoms of the carbon to a sum of the number of atoms of the carbon and the number of atoms of the nitrogen in the second unit layers, y2.
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