# US 10,309,017 B2 · Laminated hard film and cutting tool

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- Number: US 10,309,017 B2
- Document ID: US10309017B2
- Status: Granted
- Kind: B2
- Application number: 15/318,612
- Filed: 2015-06-23
- Published: 2017-06-01
- Granted: 2019-06-04
- Earliest claimed: 2014-06-24
- Assignees: Kobe Steel, Ltd.
- Applicants: Kobe Steel, Ltd.
- Inventors: Maiko Abe; Kenji Yamamoto; Hiroaki Nii
- Web page: https://patentgrep.com/patent/US10309017B2

## CPC

- C23C 28/044: {coatings specially adapted for cutting tools or wear applications}
- 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
- C04B 41/5024: {Silicates (C04B41/5022 takes precedence; silico-fluorides C04B41/5018)}
- C04B 41/5057: {Carbides}
- C04B 41/5062: {Borides, Nitrides or Silicides}
- C04B 41/522: {Multiple coatings, for one of the coatings of which at least one alternative is described}
- C23C 14/06: characterised by the coating material ({C23C14/0021} , C23C14/04 take precedence)
- C23C 28/042: {including a refractory ceramic layer, e.g. refractory metal oxides, ZrO2, rare earth oxides}
- C23C 28/42: {characterized by the composition of the alternating layers}
- C23C 28/44: {characterized by a measurable physical property of the alternating layer or system, e.g. thickness, density, hardness}
- C23C 30/005: {on hard metal substrates}
- 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)
- B23B: TURNING; BORING (arrangements for copying or controlling B23Q)
- B23C: MILLING (broaching B23D; broach-milling in making gears B23F; arrangement for copying or controlling B23Q)
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE

## Abstract

A laminated hard coating comprising a layer A and a layer B, wherein the layer A and the layer B differ in composition and are laminated. Layer A contains (MaAlbCrcTad)(BxCyNz) and satisfies 0≤a≤0.35, 0.05≤d≤0.35, 0≤x≤0.15, 0≤y≤0.50, a+b+c+d=1, and x+y+z=1. M is at least one element selected from the group consisting of V, Nb, Mo, and W; a, b, c and d represent the atomic ratios of M, Al, Cr, and Ta, respectively; and x, y, and z represent the atomic ratios of B, C and N, respectively. The layer B comprises (TiαSiβ)(BxCyNz) and satisfies 0.05≤β≤0.35, 0≤x≤0.15, 0≤y≤0.50, α+β=1, and x+y+z=1. α and β represent the atomic ratios of Ti and Si, respectively, and x, y, and z represent the atomic ratios of B, C, and N, respectively. One or more layers of each of these layers have been alternately laminated.

## Claims

### Claim 1

A laminated hard coating, comprising,
alternately laminated one or more layers A and one or more layers B,
wherein:
each layer A independently comprises (MaAlbCrcTad)(BxCyNz) and satisfies the relationships of
0≤a≤0.35, 0.05≤d≤0.35,
0≤x≤0.15, 0≤y≤0.50,
a+b+c+d=1, and x+y+z=1,
wherein M is at least one element selected from the group consisting of V, Nb, Mo, and W; a, b, c, and d represent the atomic ratios of M, Al, Cr, and Ta, respectively; and x, y and z represent the atomic ratios of B, C and N, respectively;
each layer B independently comprises (TiαSiβ)(Bx′Cy′Nz′)and satisfies the relationships of
0.05≤β≤0.35,
0≤x′≤0.15, 0≤y′≤0.50,
α+β=1, and x′+y′+z′=1,
wherein α and β represent the atomic ratios of Ti and Si, respectively; and x′, y′, and z′ represent the atomic ratios of B, C and N, respectively; and
at least one of the one or more layers B has a thickness of 80 nm or less.

### Claim 2 (depends on 1)

The laminated hard coating according to claim 1, wherein each layer A and each layer B have a thickness of 1.5 nm or more.

### Claim 3 (depends on 1)

The laminated hard coating according to claim 1, wherein each layer A and each of the remaining layers B, when present, have a thickness of 100 nm or less and a lamination number of the layer A and the layer B is plural.

### Claim 4 (depends on 1)

A cutting tool, comprising
the laminated hard coating according to claim 1 formed on a substrate surface.

### Claim 5 (depends on 4)

The cutting tool according to claim 4, wherein the substrate comprises a tungsten carbide-based cemented carbide, a cermet alloy, a high-speed tool steel, or an alloy tool steel.

### Claim 6 (depends on 2)

The laminated hard coating according to claim 2, wherein each layer A and each of the remaining layers B, when present, have a thickness of 100 nm or less and a lamination number of the layer A and the layer B is plural.

### Claim 7 (depends on 2)

A cutting tool, comprising
the laminated hard coating according to claim 2 formed on a substrate surface thereof.

### Claim 8 (depends on 3)

A cutting tool, comprising
the laminated hard coating according to claim 3 formed on a substrate surface thereof.

### Claim 9 (depends on 6)

A cutting tool, comprising
the laminated hard coating according to claim 6 formed on a substrate surface thereof.

### Claim 10 (depends on 7)

The cutting tool according to claim 7, wherein the substrate comprises a tungsten carbide-based cemented carbide, a cerment alloy, a high-speed tool steel, or an alloy tool steel.

### Claim 11 (depends on 8)

The cutting tool according to claim 8, wherein the substrate comprises a tungsten carbide-based cemented carbide, a certnent alloy, a high-speed tool steel, or an alloy tool steel.

### Claim 12 (depends on 9)

The cutting tool according to claim 9, wherein the substrate comprises a tungsten carbide-based cemented carbide, a cerment alloy, a high-speed tool steel, or an alloy tool steel.

### Claim 13 (depends on 1)

A method for enhancing wear resistance of a tool, the method comprising
coating at least a part of a surface of said tool with the laminated hard coating according to claim 1.

### Claim 14 (depends on 13)

The method of claim 13, wherein said tool is a tip, a drill, an end mill or a cutting tool.

### Claim 15 (depends on 1)

The laminated hard coating according to claim 1, wherein the atomic ratio b of Al satisfies 0.5≤b≤0.8.

### Claim 16 (depends on 1)

The laminated hard coating according to claim 1, wherein compositions of layers A and B are not mixed.