US 12,303,982 B2
Surface-coated cutting tool
Hidetoshi Asanuma, Tokyo (JP)
Assigned to MITSUBISHI MATERIALS CORPORATION, Tokyo (JP)
Appl. No. 17/427,128
Filed by MITSUBISHI MATERIALS CORPORATION, Tokyo (JP)
PCT Filed Feb. 6, 2020, PCT No. PCT/JP2020/004465
§ 371(c)(1), (2) Date Jul. 30, 2021,
PCT Pub. No. WO2020/166466, PCT Pub. Date Aug. 20, 2020.
Claims priority of application No. 2019-022629 (JP), filed on Feb. 12, 2019; and application No. 2019-022630 (JP), filed on Feb. 12, 2019.
Prior Publication US 2022/0143712 A1, May 12, 2022
Int. Cl. B23B 27/14 (2006.01); C01B 21/06 (2006.01); C23C 14/06 (2006.01)
CPC B23B 27/148 (2013.01) [C01B 21/0602 (2013.01); C23C 14/0641 (2013.01); B23B 2228/10 (2013.01); C01P 2002/50 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A surface-coated cutting tool comprising:
a tool substrate; and
a hard coat layer including a complex nitride layer on the tool substrate, the hard coat layer having an average thickness in the range of 0.5 to 10.0 μm, wherein
the complex nitride layer has a composition: (Ti1-x-yAlxMy)Nz where 0.35≤x≤0.80, 0.00≤y≤0.20, 0.20≤(1−x−y)≤0.65, and 0.90≤z≤1.10 (where x, y, and z represents atomic ratios, M is at least one element selected from the group consisting of Groups 4 to 6 elements, Y, Si, La, and Ce in the IUPAC periodic table),
the hard coat layer has an interfacial region extending from a point above a surface of the tool substrate toward a surface of the cutting tool and having a thickness in a range of 5 to 100 nm, and the N content ratio to the total of Ti, Al, M, and N contents is 10 to 30 atomic % at the point and increases toward the surface of the cutting tool, and
wherein the interfacial region has a thickness in a range of 50 to 100 nm.