Surface-coated cutting tool

• US 7,923,130 B2
• Filed: 05/23/2008
• Issued: 04/12/2011
• Est. Priority Date: 05/30/2007
• Status: Active Grant

• Current Assignee: Sumitomo Electric Hardmetal Corp (Sumitomo Corporation)
• Original Assignee: Sumitomo Electric Hardmetal Corp (Sumitomo Corporation)
• Inventors: Kobayashi, Akira, Shibata, Akihiko, Fukui, Haruyo, Imamura, Shinya
• Primary Examiner(s): TURNER, ARCHENE A
• Application Number:
  US12/599,756
• Publication Number:
  US 20100215951A1
• Time in Patent Office: 1,054 Days
• Field of Search: 513/07, 513/09, 428/216, 428/336, 428/472, 428/697, 428/698, 428/699, 428/701, 428/702, 428/704
• US Class Current: 428/697
• CPC Class Codes: C23C 14/0641 Nitrides C23C14/0617 takes precedence
• CPC Class Codes: C23C 14/0664 Carbonitrides
• CPC Class Codes: C23C 14/32 by explosion; by evaporation and subsequent ionisation of the vapours , e.g. ion-platingC23C14/34 - C23C14/48 take precedence
• CPC Class Codes: C23C 28/042 including a refractory ceramic layer, e.g. refractory metal oxides, ZrO2, rare earth oxides
• CPC Class Codes: C23C 28/044 coatings specially adapted for cutting tools or wear applications
• CPC Class Codes: C23C 28/42 characterized by the composition of the alternating layers
• CPC Class Codes: C23C 30/005 on hard metal substrates
• CPC Class Codes: Y10T 428/24975 No layer or component greater than 5 mils thick
• CPC Class Codes: Y10T 428/26 Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
• CPC Class Codes: Y10T 428/265 1 mil or less
• CPC Class Codes: Y10T 428/30 Self-sustaining carbon mass or layer with impregnant or other layer
• CPC Class Codes: Y10T 428/31678 Of metal

Abstract

A surface-coated cutting tool according to the present invention including a substrate and a coating film formed on the substrate is characterized in that the coating film includes a composite super multi-layer film obtained by alternately stacking one or more first super multi-layer film and one or more second super multi-layer film, the first super multi-layer film above is formed by alternately stacking one or more A1 layer and one or more B layer, the second super multi-layer film above is formed by alternately stacking one or more A2 layer and one or more C layer, each of the A1 layer above and the A2 layer above is composed of any of TiN, TiCN, TiAlN, and TiAlCN, the B layer above is composed of TiSiN or TiSiCN, and the C layer above is composed of AlCrN or AlCrCN.

Claims

1. A surface-coated cutting tool, comprising:

a substrate; and

a coating film formed on the substrate;

said coating film including a composite super multi-layer film obtained by alternately stacking one or more first super multi-layer film and one or more second super multi-layer film,

said first super multi-layer film being formed by alternately, one by one, stacking two or more A1 layers and two or more B layers,

said second super multi-layer film being formed by alternately, one by one, stacking two or more A2 layers and two or more C layers,

each of said A1 layer and said A2 layer being composed of any of TiN, TiCN, TiAlN, and TiAlCN,

said B layer being composed of TiSiN or TiSiCN, and

said C layer being composed of AlCrN or AlCrCN.

2. The surface-coated cutting tool according to claim 1, wherein

said A1 layer and said A2 layer are identical in composition.

3. The surface-coated cutting tool according to claim 1, wherein

each of said first super multi-layer film and said second super multi-layer film has a thickness not smaller than 0.1 μ

m and not greater than 0.5 μ

m, and a ratio of thickness Y/X is not smaller than 0.5 and not greater than 4 where a thickness of said first super multi-layer film is denoted by X and a thickness of said second super multi-layer film is denoted by Y.

4. The surface-coated cutting tool according to claim 1, wherein

each of said A1 layer, said A2 layer, said B layer, and said C layer has a thickness not greater than 40 nm, a ratio of thickness Xb/Xa is not smaller than 0.2 and not greater than 3 where a thickness of said A1 layer is denoted by Xa and a thickness of said B layer is denoted by Xb, and a ratio of thickness Yc/Ya is not smaller than 0.2 and not greater than 3 where a thickness of said A2 layer is denoted by Ya and a thickness of said C layer is denoted by Yc.

5. The surface-coated cutting tool according to claim 1, wherein

said composite super multi-layer film has a thickness not smaller than 1.0 μ

m and not greater than 8.0 μ

m.

6. The surface-coated cutting tool according to claim 1, wherein

said coating film further includes an intermediate layer, and

said intermediate layer is formed directly on said substrate to a thickness not smaller than 0.1 μ

m and not greater than 1.0 μ

m and composed of any of TiN, TiCN, TiAlN, TiAlCN, TiSiN, TiSiCN, AlCrN, and AlCrCN.

7. The surface-coated cutting tool according to claim 1, wherein

said coating film further includes a surface layer, and

said surface layer is formed as an uppermost layer of said coating film to a thickness not smaller than 0.1 μ

m and not greater than 2.0 μ

m.

8. The surface-coated cutting tool according to claim 7, wherein

said surface layer is formed of said second super multi-layer film.

9. The surface-coated cutting tool according to claim 7, wherein

said surface layer is composed of any of TiN, TiCN, TiAlN, TiAlCN, TiSiN, TiSiCN, AlCrN, and AlCrCN.

10. The surface-coated cutting tool according to claim 1, wherein

said coating film is formed with a physical vapor deposition method.

11. The surface-coated cutting tool according to claim 1, wherein

said substrate is formed from any of cemented carbide, cermet, high-speed steel, ceramics, sintered cubic boron nitride, and sintered diamond.