# US 2014/0193623 A1 · Surface-coated cutting tool

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- Number: US 2014/0193623 A1
- Document ID: US20140193623A1
- Status: Published application
- Kind: A1
- Application number: 14/236,885
- Filed: 2013-06-24
- Published: 2014-07-10
- Earliest claimed: 2012-06-29
- Assignees: Sumitomo Electric Hardmetal Corp.
- Applicants: Sumitomo Electric Hardmetal Corp.
- Inventors: Makoto Setoyama; Akihiko Shibata; Yinxue Xiao; Akira Kobayashi
- Web page: https://patentgrep.com/patent/US20140193623A1

## CPC

- B23B 27/14: Cutting tools of which the bits or tips {or cutting inserts} are of special material
- B23B 9/00: Automatic or semi-automatic turning-machines with a plurality of working-spindles, e.g. automatic multiple-spindle machines with spindles arranged in a drum carrier able to be moved into predetermined positions; Equipment therefor (equipment applicable to single-spindle machines B23B7/00)
- B23B 51/00: Tools for drilling machines
- B23C 5/16: characterised by physical features other than shape
- B32B 9/00: Layered products comprising a {layer of a} particular substance not covered by groups B32B11/00 - B32B29/00
- B32B 15/01: all layers being exclusively metallic {(making layered metal workpieces by pressure cladding B23K20/22; making coatings with a metallic material characterised by its composition C23C30/00)}
- C09D 1/00: Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
- C09D 7/67: {Particle size smaller than 100 nm}
- C23C 14/024: {Deposition of sublayers, e.g. to promote adhesion of the coating (C23C14/027 takes precedence)}
- C23C 14/0641: {Nitrides (C23C14/0617 takes precedence)}
- 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}
- C23C 28/42: {characterized by the composition of the alternating layers}
- Y10T 428/2495: Thickness [relative or absolute]
- Y10T 428/24975: No layer or component greater than 5 mils thick
- Y10T 428/25: Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
- Y10T 428/264: Up to 3 mils
- Y10T 428/265: 1 mil or less
- 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)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- 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)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A surface-coated cutting tool according to the present invention is a surface-coated cutting tool including a base material and a coating film formed on the base material, wherein the coating film includes at least a wear-resistant layer and an adhesion-resistant layer, the wear-resistant layer has a multilayer structure in which an A layer of a nitride containing Ti and Al as well as a B layer of a nitride containing Al and Cr are alternately stacked, and has a cubic crystal structure, and the adhesion-resistant layer is located at an outermost surface of the coating film, is composed of a nitride expressed by (AlaCrbTi1-a-b)N (wherein a+b<0.99, b>0.01, and 0.2b+0.7<a), and has a wurtzite-type crystal structure.

## Claims

### Claim 1

A surface-coated cutting tool including a base material and a coating film formed on the base material, wherein
said coating film includes at least a wear-resistant layer and an adhesion-resistant layer,
said wear-resistant layer has a multilayer structure in which an A layer of a nitride containing Ti and Al as well as a B layer of a nitride containing Al and Cr are alternately stacked, and has a cubic crystal structure, and
said adhesion-resistant layer is located at an outermost surface of said coating film, is composed of a nitride expressed by (AlaCrbTi1-a-b)N (wherein a+b<0.99, b>0.01, and 0.2b+0.7<a), and has a wurtzite-type crystal structure.

### Claim 2 (depends on 1)

The surface-coated cutting tool according to claim 1, wherein
in the whole of said coating film, an atomic ratio of Al to all metal atoms is higher than 0.6 and equal to or lower than 0.8, and an atomic ratio of Cr to all metal atoms is higher than 0.15 and equal to or lower than 0.3.

### Claim 3 (depends on 1)

The surface-coated cutting tool according to claim 1, wherein
said coating film has a thickness of 2 to 30 μm.

### Claim 4 (depends on 1)

The surface-coated cutting tool according to claim 1, wherein
said adhesion-resistant layer has a thickness of 0.5 to 8 μm.

### Claim 5 (depends on 1)

The surface-coated cutting tool according to claim 1, wherein
assuming that T1 represents a thickness of said wear-resistant layer and T2 represents a thickness of said adhesion-resistant layer, a thickness ratio T2/T1 satisfies a relationship of 0.17≦T2/T1≦0.55.

### Claim 6 (depends on 1)

The surface-coated cutting tool according to claim 1, wherein
assuming that Ta represents an average thickness of said A layer and Tb represents an average thickness of said B layer, a thickness ratio Tb/Ta satisfies a relationship of 1.5≦Tb/Ta≦4.

### Claim 7 (depends on 6)

The surface-coated cutting tool according to claim 6, wherein
said Ta is 1 to 10 nm and said Tb is 1.5 to 30 nm.

### Claim 8 (depends on 1)

The surface-coated cutting tool according to claim 1, wherein
said A layer is composed of a nitride expressed by (Ti1-cAlc)N (wherein 0.3<c≦0.7), and said B layer is composed of a nitride expressed by (AleCr1-e)N (wherein 0.6<e<0.75).

### Claim 9 (depends on 1)

The surface-coated cutting tool according to claim 1, wherein
said coating film has an intermediate layer between said base material and said wear-resistant layer, and
said intermediate layer is composed of a nitride containing Ti and Al, and has a thickness of 0.01 to 0.5 μm.

### Claim 10 (depends on 1)

The surface-coated cutting tool according to claim 1, wherein
said coating film has a first adherent layer and a second adherent layer between said wear-resistant layer and said adhesion-resistant layer,
said first adherent layer is located between said wear-resistant layer and said second adherent layer, is composed of a nitride containing Ti and Al, and has a thickness of 30 nm to 0.1 μm, and
said second adherent layer has a multilayer structure in which a C layer being of a nitride containing Ti and Al and having the same crystal structure as that of said wear-resistant layer as well as a D layer having the same composition as that of said adhesion-resistant layer are alternately stacked, and has a thickness of 10 nm to 0.2 μm.

### Claim 11 (depends on 1)

The surface-coated cutting tool according to claim 1, wherein
assuming that H1 represents a hardness of said wear-resistant layer and H2 represents a hardness measured from a surface of said adhesion-resistant layer, a hardness ratio H2/H1 satisfies a relationship of 0.7<H2/H1<1.1.

### Claim 12 (depends on 1)

The surface-coated cutting tool according to claim 1, wherein
assuming that H1 represents a hardness of said wear-resistant layer and H2 represents a hardness measured from a surface of said adhesion-resistant layer, a hardness ratio H2/H1 satisfies a relationship of 0.9<H2/H1<1.0.

### Claim 13 (depends on 1)

The surface-coated cutting tool according to claim 1, wherein
said coating film has a compressive stress of −0.1 GPa or less and −3.0 GPa or more.

### Claim 14 (depends on 1)

The surface-coated cutting tool according to claim 1, wherein
said coating film has a compressive stress of −1.0 GPa or less and −2.5 GPa or more.

### Claim 15 (depends on 1)

The surface-coated cutting tool according to claim 1, wherein
assuming that K1 represents a peak strength near 2θ=36° and K2 represents a peak strength near 2θ=37.4°, said coating film has an X-ray diffraction pattern in which a strength ratio K2/K1 satisfies a relationship of 0.2<K2/K1<0.35.

### Claim 16 (depends on 1)

The surface-coated cutting tool according to claim 1, wherein
assuming that K1 represents a peak strength near 2θ=37.4° and K2 represents a peak strength near 2θ=37.9°, said coating film has an X-ray diffraction pattern in which a strength ratio K2/K1 satisfies a relationship of 0.4<K2/K1<0.6.

### Claim 17 (depends on 1)

The surface-coated cutting tool according to claim 1, wherein
assuming that K1 represents a peak strength near 2θ=37.4° and K2 represents a peak strength near 2θ=43.2°, said coating film has an X-ray diffraction pattern in which a strength ratio K2/K1 satisfies a relationship of 0.6<K2/K1<0.75.

### Claim 18 (depends on 1)

The surface-coated cutting tool according to claim 1, wherein
said wear-resistant layer has a structure of columnar crystals and an average grain size of the columnar crystals is larger than 150 nm and equal to or smaller than 250 nm.

### Claim 19 (depends on 1)

The surface-coated cutting tool according to claim 1, wherein
said adhesion-resistant layer has a structure of nanoparticles and an average grain size of the nanoparticles is equal to or smaller than 40 nm.