US 12,440,901 B2
Cutting tool
Nozomi Tsukihara, Osaka (JP); and Haruyo Fukui, Osaka (JP)
Assigned to SUMITOMO ELECTRIC INDUSTRIES, LTD., Osaka (JP)
Appl. No. 19/102,525
Filed by Sumitomo Electric Industries, Ltd., Osaka (JP)
PCT Filed Mar. 19, 2024, PCT No. PCT/JP2024/010807
§ 371(c)(1), (2) Date Feb. 10, 2025,
PCT Pub. No. WO2025/196964, PCT Pub. Date Sep. 25, 2025.
Prior Publication US 2025/0296154 A1, Sep. 25, 2025
Int. Cl. B23B 27/14 (2006.01)
CPC B23B 27/148 (2013.01) [B23B 2200/36 (2013.01)] 8 Claims
OG exemplary drawing
 
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 an alternate layer in which a first unit layer and a second unit layer are alternately stacked,
the first unit layer is composed of AlaTi(1-a-b)SibN,
the second unit layer is composed of AlcCr(1-c-d)CudN,
the a, the b, the c, and the d satisfy
0.50≤a≤0.75,
0.005≤b≤0.20,
0.50≤c≤0.85, and
0.005≤d<0.10,
an average thickness of the first unit layer is 2 nm or more and 50 nm or less, and
an average thickness of the second unit layer is 2 nm or more and 50 nm or less.