US 11,938,548 B2
Cutting tool
Yuta Suzuki, Itami (JP); and Shinya Imamura, Itami (JP)
Assigned to SUMITOMO ELECTRIC HARDMETAL CORP., Itami (JP)
Appl. No. 18/018,886
Filed by Sumitomo Electric Hardmetal Corp., Itami (JP)
PCT Filed Jun. 15, 2022, PCT No. PCT/JP2022/023997
§ 371(c)(1), (2) Date Jan. 31, 2023,
PCT Pub. No. WO2023/243008, PCT Pub. Date Dec. 21, 2023.
Prior Publication US 2023/0405686 A1, Dec. 21, 2023
Int. Cl. C23C 30/00 (2006.01); B23B 27/14 (2006.01); C23C 14/02 (2006.01); C23C 14/06 (2006.01); C23C 14/32 (2006.01); C23C 14/50 (2006.01); C04B 41/50 (2006.01)
CPC B23B 27/148 (2013.01) [C23C 14/022 (2013.01); C23C 14/0641 (2013.01); C23C 14/0647 (2013.01); C23C 14/325 (2013.01); C23C 14/505 (2013.01); C23C 30/005 (2013.01); B23B 2224/24 (2013.01); B23B 2228/105 (2013.01); C04B 41/5063 (2013.01); C04B 41/5068 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A cutting tool comprising a base material and a coating arranged on the base material, wherein
the coating comprises a first layer;
the first layer has a multilayer structure in which a first unit layer and a second unit layer are alternately stacked;
a thickness of the first unit layer is 2 nm or more and 50 nm or less;
a thickness of the second unit layer is 2 nm or more and 50 nm or less;
a thickness of the first layer is 1.0 μm or more and 20 μm or less,
the first unit layer is composed of TiaAlbBcN, and
the second unit layer is composed of TidAleBfN,
wherein
0.49≤a≤0.70,
0.19≤b≤0.40,
0.10<c≤0.20,
a+b+c=1.00,
0.39≤d≤0.60,
0.29≤e≤0.50,
0.12≤f≤0.20,
d+e+f=1.00,
0.05≤a-d≤0.20, and
0.05≤e-b≤0.20 are satisfied, and
a percentage of the number of atoms of titanium to the total number of atoms of titanium, aluminum and boron is 45% or more in the first layer.