# US 2018/0021858 A1 · Surface-coated cutting tool

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- Number: US 2018/0021858 A1
- Document ID: US20180021858A1
- Status: Published application
- Kind: A1
- Application number: 15/545,182
- Filed: 2016-01-22
- Published: 2018-01-25
- Earliest claimed: 2015-01-22
- Assignees: Mitsubishi Materials Corporation
- Applicants: Mitsubishi Materials Corporation
- Inventors: Kazuaki SENBOKUYA; Masakuni TAKAHASHI; Tsuyoshi OGAMI; Tatsuo HASHIMOTO
- Web page: https://patentgrep.com/patent/US20180021858A1

## CPC

- B23B 27/148: {Composition of the cutting inserts}
- B26D 1/0006: {Cutting members therefor}
- C23C 14/0021: {Reactive sputtering or evaporation}
- C23C 14/0641: {Nitrides (C23C14/0617 takes precedence)}
- C23C 14/0652: {Silicon nitride}
- C23C 14/0664: {Carbonitrides}
- C23C 14/26: by resistance or inductive heating of the source
- C23C 14/325: {Electric arc evaporation}
- C23C 14/541: {Heating or cooling of the substrates}
- B23B 2222/92: Tungsten
- B23B 2228/105: with specified thickness
- C23C 28/044: {coatings specially adapted for cutting tools or wear applications}
- C23C 30/005: {on hard metal substrates}
- B23B: TURNING; BORING (arrangements for copying or controlling B23Q)
- B26D: CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING (for growing crops or plants A01D, A01G; for fodder or straw A01F; for bulk butter A01J; for dough A21C; slaughtering A22B; for tobacco, cigars or cigarettes A24; marking-out, perforating or making buttonholes A41H25/00; manufacturing footwear A43D; brushmaking A46D; surgery A61B; disintegrating, mincing or shredding in general B02C; cutting wire, making pins or nails B21F, B21G; of the kind used formetal B23; cutting by abrasive fluid jets B24C5/02; hand-held cutting tools B26B; perforating, cutting-out, stamping-out or punching, or severing by means other than cutting B26F; for wood B27; for stone B28D; working of plastics or substances in a plastic state B29; making boxes, cartons, envelopes or bags, of paper or similarly worked materials, e.g. metal foil, B31B; article or web delivery apparatus incorporating cutting or line-perforating devices B65H35/00; for leather or upholstery B68, C14B; for glass C03B; making matches C06F; for peat C10F; for sugar C13B45/00; for textile materials D06H; civil engineering, building, mining, see Section E; for light guides G02B6/25; cutting processed photographic material G03D15/04)
- 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

In a surface-coated cutting tool, a hard coating includes one or more layers. At least one layer thereof is a hard coating layer composed of a complex nitride or carbonitride layer of Al, Cr, and Si and satisfying (Al1-x-yCrxSiy)(CzN1-z) where x, y and z are atomic ratios and satisfy 0.1≦x≦0.4, 0.01≦y≦0.2, and 0≦z≦0.3, respectively. The hard coating layer contains particles including: less than 10 atomic % of non-metal components selected from C and N; and metal components selected from Cr, Al and Si. In the cross-section perpendicular to the tool body surface, the number ratio of oblate particles with an Al content of 50 atomic % or less, a long diameter of less than 0.5 μm, and an aspect ratio of 2.0 or more is 90% or more with respect to the total number of the particles.

## Claims

### Claim 1

A surface-coated cutting tool comprising:
a tool body made of tungsten carbide-based cemented carbide; and
a hard coating coated on a surface of the tool body, wherein
(a) the hard coating comprises one or more layers, and at least one layer thereof is a hard coating layer composed of a complex nitride layer or a complex carbonitride layer of Al, Cr, and Si, having an average thickness of 0.5 to 8.0 μm, and satisfying an average composition formula: (Al1-x-yCrxSiy)(CzN1-z) in which x, y and z are atomic ratios and satisfy 0.1≦x≦0.4, 0.01≦y≦0.2, and 0≦z≦0.3, respectively;
(b) the hard coating layer includes a plurality of particles comprising: less than 10 atomic % of non-metal component which is one or more selected from the group consisting of C and N, and metal component which is one or more elements selected from the group consisting of Cr, Al and Si; and
(c) in a cross-section of the hard coating perpendicular to the surface of the tool body, a number ratio of oblate particles having an Al content of 50 atomic % or less, a long diameter of less than 0.5 μm in the cross-section, and an aspect ratio of 2.0 or more is 90% or more with respect to a total number of a plurality of the particles.

### Claim 2 (depends on 1)

The surface-coated cutting tool according to claim 1, wherein
in the cross-section of the hard coating perpendicular to the surface of the tool body, a number ratio of oblate particles in each of which an angle between a straight line forming the long diameter and the surface of the tool body is 45° or less and each of which satisfies A>B where A is an area of a region surrounded by the straight line and outer circumference of the oblate particle at a surface side of the hard coating and B is an area of region surrounded by the straight line and the outer circumference of the oblate particle at a tool body side, is 80% or more with respect to a total number of the oblate particles in the hard coating layer.

### Claim 3 (depends on 1)

The surface-coated cutting tool according to claim 1, wherein the average thickness of the hard coating layer is 0.7 to 7.5 μm.

### Claim 4 (depends on 1)

The surface-coated cutting tool according to claim 1, wherein the hard coating layer is the outermost layer of the hard coating.

### Claim 5 (depends on 3)

The surface-coated cutting tool according to claim 3, wherein the hard coating layer is the outermost layer of the hard coating.

### Claim 6 (depends on 1)

The surface-coated cutting tool according to claim 1, wherein the amount of the non-metal component is contain 0.5 atomic % or more and less than 10 atomic %.

### Claim 7 (depends on 1)

The surface-coated cutting tool according to claim 1, wherein Al content of the metal component is 0.5 atomic % to 20 atomic %.

### Claim 8 (depends on 1)

The surface-coated cutting tool according to claim 1, wherein the number of a plurality of the particles per unit area is 1/μm2 to 5/μm2 in the cross-section.

### Claim 9 (depends on 2)

The surface-coated cutting tool according to claim 2, wherein the average thickness of the hard coating layer is 0.7 to 7.5 μm.

### Claim 10 (depends on 2)

The surface-coated cutting tool according to claim 2, wherein the hard coating layer is the outermost layer of the hard coating.