Coated tool, cutting tool, and method for manufacturing machined product
A coated tool may include a base member having a first surface and a coating layer may be located on the first surface. The coating layer may include a first layer having a plurality of α-Al 2 O 3 crystal particles. At least one of the α-Al 2 O 3 crystal particles has at least two regions with different orientations from each other.
1. A coated tool, comprising:
a base member comprising a first surface; and
a coating layer located on the first surface;
wherein
the coating layer comprises:
a first layer comprising a plurality of α-Al 2 O 3 crystal particles, and
a second layer comprising a titanium compound, the second layer in contact with the first layer and located between the first layer and the base member; and
at least one of the α-Al 2 O 3 crystal particles comprises at least two regions with different orientations from each other.
2. The coated tool according to claim 1 , wherein the at least one of the α-Al 2 O 3 crystal particles comprises three or more regions with different oriented regions from each other.
3. The coated tool according to claim 1 , wherein a boundary between the different oriented regions of the at least one of the α-Al 2 O 3 crystal particles extends along a thickness direction of the first layer.
4. The coated tool according to claim 3 , wherein
the first layer comprises:
a surface A facing the base member; and
a surface B located on an opposite side of the surface A; and
at least one of the α-Al 2 O 3 crystal particles comprising at least two regions with different orientations is located from the surface A to the surface B.
5. The coated tool according to claim 1 , wherein the first layer comprises a part where a plurality of α-Al 2 O 3 crystal particles comprising at least two regions with different orientations are adjacent to each other.
6. The coated tool according to claim 5 , wherein the plurality of α-Al 2 O 3 crystal particles comprising at least two regions with different orientations are adjacent to each other along a thickness direction of the first layer.
7. The coated tool according to claim 5 , wherein the plurality of α-Al 2 O 3 crystal particles comprising at least two regions with different orientations are adjacent to each other along a direction orthogonal to a thickness direction of the first layer.
8. The coated tool according to claim 1 , wherein a mean particle diameter of the at least one of the α-Al 2 O 3 crystal particles comprising at least two regions with different orientations is larger than a mean particle diameter of a set of crystal particles other than the at least one α-Al 2 O 3 crystal particles comprising at least two regions with different orientations.
9. The coated tool according to claim 1 , wherein a boundary between the at least two regions with different orientations is a Σ3-type crystal grain boundary.
10. A cutting tool, comprising:
a holder comprising a pocket located at a front end side; and
the coated tool according to claim 1 , which is located at the pocket.
11. A method for manufacturing a machined product, comprising:
rotating the cutting tool according to claim 10 ;
bringing the cutting tool being rotated into contact with a workpiece; and
moving the cutting tool away from the workpiece.
12. The coated tool according to claim 6 , wherein the plurality of Al 2 O 3 crystal particles comprising at least two regions with different orientations are adjacent to each other along a direction orthogonal to a thickness direction of the first layer.