# US 11,897,037 B2 · Coated cutting tool

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- Number: US 11,897,037 B2
- Document ID: US11897037B2
- Status: Granted
- Kind: B2
- Application number: 16/349,293
- Filed: 2017-10-23
- Published: 2020-06-18
- Granted: 2024-02-13
- Earliest claimed: 2016-11-17
- Assignees: Tungaloy Corporation
- Applicants: Tungaloy Corporation
- Inventors: Hiroyuki Satoh; Yusuke Hirano
- Web page: https://patentgrep.com/patent/US11897037B2

## CPC

- B23B 27/148: {Composition of the cutting inserts}
- C23C 30/005: {on hard metal substrates}
- B23B 27/14: Cutting tools of which the bits or tips {or cutting inserts} are of special material
- B23B 51/00: Tools for drilling machines
- B23C 5/16: characterised by physical features other than shape
- C23C 16/30: Deposition of compounds, mixtures or solid solutions, e.g. borides, carbides, nitrides
- C23C 16/40: Oxides
- C23C 16/403: {of aluminium, magnesium or beryllium}
- C23C 28/04: only coatings of inorganic non-metallic material
- C23C 28/042: {including a refractory ceramic layer, e.g. refractory metal oxides, ZrO2, rare earth oxides}
- C23C 28/044: {coatings specially adapted for cutting tools or wear applications}
- B23B 2228/105: with specified thickness
- B23B: TURNING; BORING (arrangements for copying or controlling B23Q)
- C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04)
- B23C: MILLING (broaching B23D; broach-milling in making gears B23F; arrangement for copying or controlling B23Q)

## Abstract

A coated cutting tool comprising a substrate and a coating layer formed on a surface of the substrate, wherein: the coating layer comprises at least one α-type aluminum oxide layer; and, in the α-type aluminum oxide layer, a texture coefficient TC (0,0,12) of a (0,0,12) plane is from 4.0 or more to 8.4 or less, and a texture coefficient TC (1,0,16) of a (1,0,16) plane is from 0.4 or more to 3.0 or less.

## Claims

### Claim 1

A coated cutting tool comprising a substrate and a coating layer formed on a surface of the substrate, wherein:
the coating layer comprises at least one α-type aluminum oxide layer having an average thickness of 5.2 μm or more to 8.0 μm or less;
in the α-type aluminum oxide layer, a texture coefficient TC (0,0,12) of a (0,0,12) plane represented by formula (1) below is from 7.0 or more to 7.8 or less, and a texture coefficient TC (1,0,16) of a (1,0,16) plane represented by formula (2) below is from 0.4 or more to 1.8 or less:
TC
⁡
(
0
,
0
,
12
)
=
I
⁡
(
0
,
0
,
12
)
I
0
⁡
(
0
,
0
,
12
)
⁢
{
1
9
⁢
∑
I
⁡
(
h
,
k
,
l
)
I
0
⁡
(
h
,
k
,
l
)
}
-
1
(
1
)
TC
⁡
(
1
,
0
,
16
)
=
I
⁡
(
1
,
0
,
16
)
I
0
⁡
(
1
,
0
,
16
)
⁢
{
1
9
⁢
∑
I
⁡
(
h
,
k
,
l
)
I
0
⁡
(
h
,
k
,
l
)
}
-
1
(
2
)
and in formulae (1) and (2), I (h,k,l) denotes a peak intensity for an (h,k,l) plane in X-ray diffraction of the α-type aluminum oxide layer, I0 (h,k,l) denotes a standard diffraction intensity for an (h,k,l) plane which is indicated on JCPDS Card No. 10-0173 for α-type aluminum oxide, and (h,k,l) refers to the nine crystal planes of (0,1,2), (1,0,4), (1,1,0), (1,1,3), (1,1,6), (2,1,4), (3,0,0), (0,0,12) and (1,0,16), and
the coating layer comprises, between the substrate and the α-type aluminum oxide layer, a Ti compound layer containing a Ti compound of Ti and an element of at least one kind selected from the group consisting of C, N, O and B.

### Claim 2 (depends on 1)

The coated cutting tool according to claim 1, wherein, in the α-type aluminum oxide layer, the texture coefficient TC (1,0,16) is from 0.7 or more to 1.2 or less.

### Claim 3 (depends on 1)

The coated cutting tool according to claim 1, wherein a residual stress value in a (1,1,6) plane of the α-type aluminum oxide layer is, in at least part thereof, from −300 MPa or higher to 300 MPa or lower.

### Claim 4 (depends on 1)

The coated cutting tool according to claim 1, wherein an average particle size of the α-type aluminum oxide layer is from 0.1 μm or more to 3.0 μm or less.

### Claim 5 (depends on 1)

The coated cutting tool according to claim 1, wherein the Ti compound layer comprises at least one TiCN layer, and an average thickness of the TiCN layer is from 2.0 μm or more to 20.0 μm or less.

### Claim 6 (depends on 1)

The coated cutting tool according to claim 1, wherein an average thickness of the coating layer is from 3.0 μm or more to 30.0 μm or less.

### Claim 7 (depends on 1)

The coated cutting tool according to claim 1, wherein the substrate is a cermet or a ceramic body.

### Claim 8 (depends on 2)

The coated cutting tool according to claim 2, wherein a residual stress value in a (1,1,6) plane of the α-type aluminum oxide layer is, in at least part thereof, from −300 MPa or higher to 300 MPa or lower.

### Claim 9 (depends on 2)

The coated cutting tool according to claim 2, wherein an average particle size of the α-type aluminum oxide layer is from 0.1 μm or more to 3.0 μm or less.

### Claim 10 (depends on 3)

The coated cutting tool according to claim 3, wherein an average particle size of the α-type aluminum oxide layer is from 0.1 μm or more to 3.0 μm or less.

### Claim 11 (depends on 6)

The coated cutting tool according to claim 6, wherein the Ti compound layer comprises at least one TiCN layer, and an average thickness of the TiCN layer is from 2.0 μor more to 20.0 μm or less.

### Claim 12 (depends on 1)

The coated cutting tool according to claim 1, wherein, in the α-type aluminum oxide layer, the texture coefficient TC (1,0,16) is from 0.5 or more to 0.9 or less.

### Claim 13 (depends on 3)

The coated cutting tool according to claim 3, wherein, in the α-type aluminum oxide layer, the texture coefficient TC (1,0,16) is from 0.5 or more to 0.9 or less.

### Claim 14 (depends on 4)

The coated cutting tool according to claim 4, wherein, in the α-type aluminum oxide layer, the texture coefficient TC (1,0,16) is from 0.5 or more to 0.9 or less.