Coated tool
A coated tool may include a base member and a coating layer located on the base member. The coating layer may include an alternating layer having first layers and second layers. The first layers may contain (Ti b Nb d M e )C x N 1-x (where M is one or more kinds selected from metals of Groups 4, 5 and 6 in the periodic table except for Ti and Nb, and Al, 0.2≤b≤0.8, 0.01≤d≤0.2, 0≤e≤0.7, b+d+e=1 and 0<x<1). The second layers may contain M′N (where M′ is metal of Groups 4, 5 and 6 in the periodic table except for Nb).
1. A coated tool, comprising:
a base member; and
a coating layer located on the base member, wherein
the coating layer comprises an alternating layer comprising first layers and second layers laminated alternately, wherein the first layers comprise a composition represented by the formula (Ti b Nb d M e )C x N 1-x (where M is one or more kinds selected from metals of Groups 4, 5 and 6 in the periodic table except for Ti and Nb, and Al, 0.2≤b≤0.8, 0.01≤d≤0.2, 0≤e≤0.7, b+d+e=1 and 0<x<1), and the second layers consists of a composition represented by the formula M′N (where M′ is metal of Groups 4, 5 and 6 in the periodic table except for Nb).
2. The coated tool according to claim 1 , wherein
an average value of thicknesses of the second layers is greater than an average value of thicknesses of the first layers.
3. The coated tool according to claim 2 , wherein
a ratio of the average value of thicknesses of the first layers to the average value of thicknesses of the second layers is 0.6-0.9.
4. The coated tool according to claim 1 , wherein
a thickness of one of a plurality of the first layers which is located closest to the base member is greater than a thickness of each of the plurality of the first layers other than the one of the plurality of the first layers.
5. The coated tool according to claim 1 , wherein
a thickness of one of a plurality of the second layers which is located closest to the base member is greater than a thickness of each of the plurality of the second layers other than the one of the plurality of the second layers.
6. The coated tool according to claim 1 , wherein
a thickness of one of a plurality of the first layers which is located furthest away from the base member is greater than a thickness of each of the plurality of the first layers other than the first layer located closest to the base member.
7. The coated tool according to claim 1 , wherein
the coating layer further comprises an intermediate layer located between the alternating layer and the base member and comprising a TiN layer or CrN layer having a thickness of 0.1-1 μm.
8. The coated tool according to claim 7 , wherein
a thickness of the intermediate layer is greater than a thickness of each of a plurality of the first layers and greater than a thickness of each of a plurality of the second layers.
9. The coated tool according to claim 7 , wherein
one of the second layers is adjacent to the intermediate layer.
10. The coated tool according to claim 1 , wherein
the base member is composed of a cBN sintered body.
11. The coated tool according to claim 1 , wherein the second layers substantially consist of a composition selected from the group consisting of TiN, CrN, WN, and combinations thereof.
12. The coated tool according to claim 1 , wherein the second layers substantially consist of TiN.