# US 11,305,357 B2 · Coated cutting tool

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- Number: US 11,305,357 B2
- Document ID: US11305357B2
- Status: Granted
- Kind: B2
- Application number: 17/076,038
- Filed: 2020-10-21
- Published: 2021-06-24
- Granted: 2022-04-19
- Earliest claimed: 2019-12-19
- Assignees: Tungaloy Corporation
- Applicants: Tungaloy Corporation
- Inventors: Katsuya Ishii
- Web page: https://patentgrep.com/patent/US11305357B2

## CPC

- B23B 27/14: Cutting tools of which the bits or tips {or cutting inserts} are of special material
- C23C 30/005: {on hard metal substrates}
- C23C 16/303: {Nitrides}
- C23C 16/32: Carbides
- C23C 16/36: Carbonitrides
- C23C 16/403: {of aluminium, magnesium or beryllium}
- C23C 28/04: only coatings of inorganic non-metallic material
- C23C 28/044: {coatings specially adapted for cutting tools or wear applications}
- B23B 2228/04: applied by chemical vapour deposition [CVD]
- B23B 2228/105: with specified thickness
- B23B 2228/36: Multi-layered
- 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)

## Abstract

A coated cutting tool of the present invention comprises a substrate and a coating layer formed on a surface of the substrate, wherein the coating layer comprises a lower layer and an upper layer formed on a surface of the lower layer, the lower layer comprises a specified Ti compound layer having a specified average thickness, the upper layer comprises an α-aluminum oxide layer having a specified average thickness, the Ti compound layer comprises at least one Ti carbonitride layer, the Ti carbonitride is composed of Ti(CxN1-x) (0.65<x≤0.90), and a texture coefficient TC(331) of a (331) plane in the Ti carbonitride layer satisfies a specified range.

## 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 a lower layer and an upper layer formed on a surface of the lower layer,
the lower layer comprises a Ti compound layer comprising one or more layers selected from the group consisting of a Ti carbide layer, a Ti nitride layer, a Ti carbonitride layer, a Ti oxycarbide layer, and a Ti oxycarbonitride layer,
an average thickness of the lower layer is 3.0 μm or more and 15.0 μm or less,
the upper layer comprises an α-aluminum oxide layer,
an average thickness of the upper layer is 3.0 μm or more and 15.0 μm or less,
the Ti compound layer comprises at least one Ti carbonitride layer,
the composition of the Ti carbonitride layer is represented by the following formula (i):
Ti(CxN1-x) (i),
wherein in the formula, x represents an atomic ratio of a C element to a total of the C element and an N element in the Ti carbonitride layer, and satisfies 0.65<x≤0.90, and
in the Ti carbonitride layer, a texture coefficient TC(331) of a (331) plane represented by a following formula (1) is 1.5 or more and 4.0 or less:
T
⁢
C
⁡
(
3
⁢
3
⁢
1
)
=
I
⁡
(
33
⁢
1
)
I
0
⁡
(
3
⁢
3
⁢
1
)
⁢
{
1
8
⁢
∑
I
⁡
(
hkl
)
I
0
⁡
(
hkl
)
}
-
1
,
(
1
)
wherein in the formula (1), I(hkl) represents a peak intensity of an (hkl) plane in X-ray diffraction of the Ti carbonitride layer, I0(hkl) represents an average value of a standard diffraction intensity of the (hkl) plane of Ti carbide in a JCPDS card number 32-1383 and a standard diffraction intensity of the (hkl) plane of Ti nitride in a JCPDS card number 32-1420, and (hkl) indicates eight crystal planes (111), (200), (220), (311), (331), (420), (422), and (511) and
wherein grains constituting the Ti carbonitride layer have an average grain size of 0.3 μm or more and 2.0 μm or less.

### Claim 2 (depends on 1)

The coated cutting tool according to claim 1, wherein the texture coefficient TC(331) in the Ti carbonitride layer is 2.0 or more and 4.0 or less.

### Claim 3 (depends on 1)

The coated cutting tool according to claim 1, wherein the coating layer comprises an outer layer formed on a surface of the upper layer,
the outer layer comprises a Ti nitride layer and/or a Ti carbonitride layer,
an average thickness of the outer layer is 0.1 μm or more and 5.0 μm or less.

### Claim 4 (depends on 1)

The coated cutting tool according to claim 1, wherein an average thickness of the entire coating layer is 7.5 μm or more and 25.0 μm or less.

### Claim 5 (depends on 1)

The coated cutting tool according to claim 1, wherein the substrate is composed of any of a cemented carbide, a cermet, a ceramic and a cubic boron nitride sintered body.

### Claim 6 (depends on 2)

The coated cutting tool according to claim 2, wherein the coating layer comprises an outer layer formed on a surface of the upper layer,
the outer layer comprises a Ti nitride layer and/or a Ti carbonitride layer,
an average thickness of the outer layer is 0.1 μm or more and 5.0 μm or less.

### Claim 7 (depends on 2)

The coated cutting tool according to claim 2, wherein an average thickness of the entire coating layer is 7.5 μm or more and 25.0 μm or less.

### Claim 8 (depends on 3)

The coated cutting tool according to claim 3, wherein an average thickness of the entire coating layer is 7.5 μm or more and 25.0 μm or less.

### Claim 9 (depends on 6)

The coated cutting tool according to claim 6, wherein an average thickness of the entire coating layer is 7.5 μm or more and 25.0 μm or less.

### Claim 10 (depends on 2)

The coated cutting tool according to claim 2, wherein the substrate is composed of any of a cemented carbide, a cermet, a ceramic and a cubic boron nitride sintered body.

### Claim 11 (depends on 3)

The coated cutting tool according to claim 3, wherein the substrate is composed of any of a cemented carbide, a cermet, a ceramic and a cubic boron nitride sintered body.