Coated cutting tool

Patent metadata

Field	Value
Publication number	US-12594607-B2
Application number	US-202318311493-A
Country	US
Kind code	B2
Filing date	May 3, 2023
Priority date	May 17, 2022
Publication date	Apr 7, 2026
Grant date	Apr 7, 2026

Abstract

A coated cutting tool including a substrate and a coating layer formed on the substrate, wherein the coating layer comprises an alternately laminated structure of a first layer and a second layer, the first layer contains a compound having a composition represented by (AlaMbTi1-a-b)N (M represents at least one of a Nb element and a Ta element, and 0.75≤a≤0.90 and 0.00<b≤0.20 are satisfied), the second layer contains a compound having a composition represented by (AlcMdTi1-c-d)N (M represents at least one of a Nb element and a Ta element, and 0.75≤c≤0.90 and 0.00≤d≤0.20 are satisfied), at least one of a and c is 0.80 or more, and the average thickness of the alternately laminated structure is 0.5 μm or more and 5.0 μm or less.

First claim

What is claimed is:

1 . A coated cutting tool comprising a substrate and a coating layer formed on the substrate, wherein,
the coating layer comprises an alternately laminated structure of a first layer and a second layer; the first layer contains a compound having a composition represented by a following formula (1):
(Al a M b Ti 1-a-b )N  (1)

wherein M represents at least one of a Nb element and a Ta element; a is an atomic ratio of an Al element to a total of the Al element, an element represented by M, and a Ti element, and satisfies 0.75≤a≤0.90, and b is an atomic ratio of the element represented by M to the total of the Al element, the element represented by M, and the Ti element, and satisfies 0.00<b≤0.20; the second layer contains a compound having a composition represented by a following formula (2), the compound contained in the second layer being different from the compound contained in the first layer:
(Al c M d Ti 1-c-d )N  (2)

wherein M represents at least one of a Nb element and a Ta element; c is an atomic ratio of an Al element to a total of the Al element, an element represented by M, and a Ti element, and satisfies 0.75≤c≤0.90; and d is an atomic ratio of the element represented by M to the total of the Al element, the element represented by M, and the Ti element, and satisfies 0.00≤d≤0.20; at least one of a and c is 0.80 or more; and an average thickness of the alternately laminated structure is 0.5 μm or more and 5.0 μm or less.

2 . The coated cutting tool according to claim 1 , wherein where a sum of diffraction peak intensities of a cubic crystal ( 111 ) plane and a cubic crystal ( 200 ) plane is denoted by I cub and a sum of diffraction peak intensities of a hexagonal crystal ( 110 ) plane and a hexagonal crystal ( 100 ) plane is denoted by I hex in X-ray diffraction of the alternately laminated structure, I hex /I cub is 0.00 or more and 0.40 or less.

3 . The coated cutting tool according to claim 1 , wherein an average composition of the entire compound of the alternately laminated structure is represented by a following formula (3):
(Al e M f Ti 1-e-f )N  (3)
wherein M represents at least one of a Nb element and a Ta element, e is an atomic ratio of an Al element to a total of the Al element, an element represented by M, and a Ti element, and satisfies 0.80≤e≤0.90; and f is an atomic ratio of the element represented by M to the total of the Al element, the element represented by M, and the Ti element.

4 . The coated cutting tool according to claim 3 , wherein f satisfies 0.00<f≤0.10 in the formula (3).

5 . The coated cutting tool according to claim 1 , wherein a and c satisfy 0.00≤|a-c|≤0.05.

6 . The coated cutting tool according to claim 1 , wherein an average thickness per layer of the first layer is 2 nm or more and 50 nm or less; and an average thickness per layer of the second layer is 2 nm or more and 50 nm or less.

7 . The coated cutting tool according to claim 2 , wherein an average composition of the entire compound of the alternately laminated structure is represented by a following formula (3):
(Al e M f Ti 1-e-f )N  (3)
wherein M represents at least one of a Nb element and a Ta element, e is an atomic ratio of an Al element to a total of the Al element, an element represented by M, and a Ti element, and satisfies 0.80≤e≤0.90; and f is an atomic ratio of the element represented by M to the total of the Al element, the element represented by M, and the Ti element.

8 . The coated cutting tool according to claim 7 , wherein f satisfies 0.00<f≤0.10 in the formula (3).

9 . The coated cutting tool according to claim 2 , wherein a and c satisfy 0.00≤|a-c|≤0.05.

10 . The coated cutting tool according to claim 3 , wherein a and c satisfy 0.00≤|a-c|≤0.05.

11 . The coated cutting tool according to claim 4 , wherein a and c satisfy 0.00≤|a-c|≤0.05.

12 . The coated cutting tool according to claim 7 , wherein a and c satisfy 0.00≤|a-c|≤0.05.

13 . The coated cutting tool according to claim 8 , wherein a and c satisfy 0.00≤|a-c|≤0.05.

14 . The coated cutting tool according to claim 2 , wherein an average thickness per layer of the first layer is 2 nm or more and 50 nm or less; and an average thickness per layer of the second layer is 2 nm or more and 50 nm or less.

15 . The coated cutting tool according to claim 3 , wherein an average thickness per layer of the first layer is 2 nm or more and 50 nm or less; and an average thickness per layer of the second layer is 2 nm or more and 50 nm or less.

16 . The coated cutting tool according to claim 4 , wherein an average thickness per layer of the first layer is 2 nm or more and 50 nm or less; and an average thickness per layer of the second layer is 2 nm or more and 50 nm or less.

17 . The coated cutting tool according to claim 5 , wherein an average thickness per layer of the first layer is 2 nm or more and 50 nm or less; and an average thickness per layer of the second layer is 2 nm or more and 50 nm or less.

18 . The coated cutting tool according to claim 7 , wherein an average thickness per layer of the first layer is 2 nm or more and 50 nm or less; and an average thickness per layer of the second layer is 2 nm or more and 50 nm or less.

19 . The coated cutting tool according to claim 8 , wherein an average thickness per layer of the first layer is 2 nm or more and 50 nm or less; and an average thickness per layer of the second layer is 2 nm or more and 50 nm or less.

20 . The coated cutting tool according to claim 9 , wherein an average thickness per layer of the first layer is 2 nm or more and 50 nm or less; and an average thickness per layer of the second layer is 2 nm or more and 50 nm or less.

Assignees

• Tungaloy Corp

Inventors

• Katagiri Takao

Classifications

• C23C28/042

  including a refractory ceramic layer, e.g. refractory metal oxides, ZrO2, rare earth oxides · CPC title

• B23B2224/32

  Titanium carbide nitride (TiCN) · CPC title

• B23B2224/24

  Titanium aluminium nitride · CPC title

• C23C28/044

  coatings specially adapted for cutting tools or wear applications · CPC title

• C23C28/44

  characterized by a measurable physical property of the alternating layer or system, e.g. thickness, density, hardness · CPC title