04-06-2020 дата публикации
Номер: WO2020111657A1
Принадлежит:
A hard coating for cutting tools according to the present invention is a hard coating for cutting tools which is formed adjacent to a hard matrix by a PVD method, and is characterized in that: the hard coating has a thickness of 0.5-10㎛ in total and one or more nitride layers and one or more oxide layers wherein the one or more nitride layers are each 0.1-5.0㎛ in thickness and composed of AlaTibMecN (Me is at least one selected from Si, W, Nb, Mo, Ta, Hf, Zr, and Y, 0.55≤a≤0.7, 0.2<b≤0.45, 0≤c<0.1) or AlaCrbMecN (Me is at least one selected from Si, W, Nb, Mo, Ta, Hf, Zr, and Y, 0.55≤a≤0.7, 0.2<b≤0.45, 0≤c<0.1) in a cubic phase, and the one or more oxide layers are each 0.1-3.0㎛ in thickness and composed of γ-Al2O3 in a cubic phase; when the number of compositionally discontinuous interfaces across the entirety of the hard coating including the hard matrix is n, 4≤n≤9; the ratio of the microhardness of the nitride layer (H1) to the microhardness (H2) of the oxide layer satisfies 1.03 < ...
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