# US 8,784,977 B2 · Coated cubic boron nitride sintered body tool

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- Number: US 8,784,977 B2
- Document ID: US8784977B2
- Status: Granted
- Kind: B2
- Application number: 13/380,411
- Filed: 2009-06-22
- Published: 2012-04-19
- Granted: 2014-07-22
- Earliest claimed: 2009-06-22
- Assignees: Tungaloy Corporation
- Applicants: Hiroyuki Miura
- Inventors: Hiroyuki Miura
- Web page: https://patentgrep.com/patent/US8784977B2

## CPC

- C23C 14/0036: {Reactive sputtering}
- C04B 35/5831: based on cubic boron nitrides {or Wurtzitic boron nitrides, including crystal structure transformation of powder}
- C04B 41/009: {characterised by the material treated}
- C04B 41/52: Multiple coating or impregnating {multiple coating or impregnating with the same composition or with compositions only differing in the concentration of the constituents, is classified as single coating or impregnation}
- C04B 41/89: for obtaining at least two superposed coatings having different compositions
- 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}
- C04B 2235/386: Boron nitrides
- C04B 2235/3886: Refractory metal nitrides, e.g. vanadium nitride, tungsten nitride
- C04B 2235/402: Aluminium
- Y10T 428/24975: No layer or component greater than 5 mils thick
- Y10T 428/265: 1 mil or less
- Y10T 428/31678: Of metal
- 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)
- 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
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A cubic boron nitride sintered substrate has a coating with lower and upper layers. The upper layer has an average layer thickness of 0.5 to 3.0 μm and is formed from a compound of a compositional formula Mα, where M represents one or more of Ti, V, Zr, Nb, Mo, Al, Si, and α is one or more of C, N, B and O. The lower layer has an average thickness of 0.5 to 3.0 μm and has alternated first and second thin layers. The first thin layer is formed from a compound with compositional formula (Ti(1-x)Lx)β, where L is one or more of Al, B and Si, and β is C or N, or both. The second thin layer is formed with compositional formula (Al(1-y)Jy)γ, where J represents one or more of Ti, V, Cr, Zr, Nb and Mo, and γ is C or N, or both.

## Claims

### Claim 1

A coated cubic boron nitride sintered body tool which is a coated cubic boron nitride sintered body tool at least whose blade edge comprises a coated cubic boron nitride sintered body where the surface of a cubic boron nitride sintered body substrate is coated with a coating layer, wherein;
(1) the coating layer includes a lower layer and an upper layer, the lower layer being closer to the substrate than the upper layer, and an intermediate layer formed between the lower layer and the upper layer;
(2) the upper layer has an average thickness of 0.5 to 3.0 μm and comprises a compound represented by a compositional formula Mα, where M represents at least one element selected from Ti, V, Zr, Nb, Mo, Al and Si, and α represents at least one element selected from C, N, B and O;
(3) the lower layer has an average layer thickness of 0.5 to 3.0 μm and is an alternately laminated material in which a first thin layer having an average layer thickness of 60 to 200 nm is alternately laminated with a second thin layer having an average layer thickness of 60 to 200 nm, wherein:
(a) the first thin layer comprises a compound represented by the compositional formula (Ti(1-x)Lx)β, where L represents at least one element selected from Al, B and Si, x represents an atomic ratio of L based on the sum of Ti and L, and satisfies 0.01≦x≦0.7, and β represents at least one element selected from C and N, and
(b) the second thin layer comprises a compound represented by the compositional formula (Al(1-y)Jy)γ, where J represents at least one element selected from Ti, V, Cr, Zr, Nb and Mo, y represents an atomic ratio of J based on the sum of Al and J, and satisfies 0.1≦y≦0.5, and γ represents at least one element selected from C and N; and
(4) the intermediate layer is a metal layer having an average layer thickness of 5 to 100 nm and formed of the same elements found in component M of the upper layer.

### Claim 2 (depends on 1)

The coated cubic boron nitride sintered body tool according to claim 1, wherein
the first thin layer of the lower layer is a layer of a compound represented by the compositional formula (Ti(1-x)Alx)N, where x represents an atomic ratio of Al based on the sum of Ti and Al, and satisfies 0.4≦x≦0.7.

### Claim 3 (depends on 1)

The coated cubic boron nitride sintered body tool according to claim 1, wherein
the first thin layer of the lower layer is a layer of a compound represented by the compositional formula (Ti(1-x)Six)N, where x represents an atomic ratio of Si based on the sum of Ti and Si, and satisfies 0.01≦x≦0.3.

### Claim 4 (depends on 1)

The coated cubic boron nitride sintered body tool according to claim 1, wherein
the second thin layer of the lower layer is a layer of a compound represented by the compositional formula (Al(1-y)Cry)N, where y represents an atomic ratio of Cr based on the sum of Al and Cr, and satisfies 0.2≦y≦0.4.

### Claim 5 (depends on 1)

The coated cubic boron nitride sintered body tool according to claim 1, wherein
the tool has a bottom layer formed between the surface of the cubic boron nitride sintered body substrate and the lower layer, and
the bottom layer has an average layer thickness of 60 to 200 nm and comprises a compound represented by the compositional formula (Al(1-y)Cry)N, where y represents an atomic ratio of Cr based on the sum of Al and Cr, and satisfies 0.2≦y≦0.4.

### Claim 6 (depends on 1)

The coated cubic boron nitride sintered body tool according to claim 1, wherein
the upper layer is an upper layer whose full width at half maximum intensity of a diffraction line having the highest peak intensity among the diffraction lines of an X-ray diffraction analysis using Cu—Kα radiation is 0.80° or less.

### Claim 7 (depends on 2)

The coated cubic boron nitride sintered body tool according to claim 2, wherein
the second thin layer of the lower layer is a layer of a compound represented by the compositional formula (Al(1-y)Cry)N, where y represents an atomic ratio of Cr based on the sum of Al and Cr, and satisfies 0.2≦y≦0.4.

### Claim 8 (depends on 3)

The coated cubic boron nitride sintered body tool according to claim 3, wherein
the second thin layer of the lower layer is a layer of a compound represented by the compositional formula (Al(1-y)Cry)N, where y represents an atomic ratio of Cr based on the sum of Al and Cr, and satisfies 0.2≦y≦0.4.

### Claim 9 (depends on 2)

The coated cubic boron nitride sintered body tool according to claim 2, wherein
the tool has a bottom layer formed between the surface of the cubic boron nitride sintered body substrate and the lower layer, and
the bottom layer has an average layer thickness of 60 to 200 nm and comprises a compound represented by the compositional formula (Al(1-y)Cry)N, where y represents an atomic ratio of Cr based on the sum of Al and Cr, and satisfies 0.2≦y≦0.4.

### Claim 10 (depends on 3)

The coated cubic boron nitride sintered body tool according to claim 3, wherein
the tool has a bottom layer formed between the surface of the cubic boron nitride sintered body substrate and the lower layer, and
the bottom layer has an average layer thickness of 60 to 200 nm and comprises a compound represented by the compositional formula (Al(1-y)Cry)N, where y represents an atomic ratio of Cr based on the sum of Al and Cr, and satisfies 0.2≦y≦0.4.

### Claim 11 (depends on 4)

The coated cubic boron nitride sintered body tool according to claim 4, wherein
the tool has a bottom layer formed between the surface of the cubic boron nitride sintered body substrate and the lower layer, and
the bottom layer has an average layer thickness of 60 to 200 nm and comprises a compound represented by the compositional formula (Al(1-y)Cry)N, where y represents an atomic ratio of Cr based on the sum of Al and Cr, and satisfies 0.2≦y≦0.4.

### Claim 12 (depends on 7)

The coated cubic boron nitride sintered body tool according to claim 7, wherein
the tool has a bottom layer formed between the surface of the cubic boron nitride sintered body substrate and the lower layer, and
the bottom layer has an average layer thickness of 60 to 200 nm and comprises a compound represented by the compositional formula (Al(1-y)Cry)N, where y represents an atomic ratio of Cr based on the sum of Al and Cr, and satisfies 0.2≦y≦0.4.

### Claim 13 (depends on 8)

The coated cubic boron nitride sintered body tool according to claim 8, wherein
the tool has a bottom layer formed between the surface of the cubic boron nitride sintered body substrate and the lower layer, and
the bottom layer has an average layer thickness of 60 to 200 nm and comprises a compound represented by the compositional formula (Al(1-y)Cry)N, where y represents an atomic ratio of Cr based on the sum of Al and Cr, and satisfies 0.2≦y≦0.4.

### Claim 14 (depends on 2)

The coated cubic boron nitride sintered body tool according to claim 2, wherein
the upper layer is an upper layer whose full width at half maximum intensity of a diffraction line having the highest peak intensity among the diffraction lines of an X-ray diffraction analysis using Cu—Kα radiation is 0.80° or less.

### Claim 15 (depends on 3)

The coated cubic boron nitride sintered body tool according to claim 3, wherein
the upper layer is an upper layer whose full width at half maximum intensity of a diffraction line having the highest peak intensity among the diffraction lines of an X-ray diffraction analysis using Cu—Kα radiation is 0.80° or less.

### Claim 16 (depends on 1)

The coated cubic boron nitride sintered body tool according to claim 1, wherein:
the upper layer comprises a compound represented by TiN, TiCN, Al2O3, TiAlN, TiSiN, TiAlNbN, or ZrAlN.

### Claim 17 (depends on 1)

The coated cubic boron nitride sintered body tool according to claim 1, wherein:
the upper layer comprises a compound represented by TiN, TiCN, Al2O3 or TiAlN.

### Claim 18 (depends on 1)

The coated cubic boron nitride sintered body tool according to claim 1, wherein:
the upper layer comprises a compound represented by TiSiN, TiAlNbN, or ZrAlN.