Surface-coated cutting tool

Patent metadata

Field	Value
Publication number	US-9457407-B2
Application number	US-201314389282-A
Country	US
Kind code	B2
Filing date	Apr 11, 2013
Priority date	Apr 19, 2012
Publication date	Oct 4, 2016
Grant date	Oct 4, 2016

Abstract

A surface-coated cutting tool of the present invention includes a base material and a coating formed on the base material, the coating includes one or two or more layers, a layer among these layers that abuts on the base material is a TiN layer, the TiN layer contains at least one element together with TiN, the element has a concentration distribution in a thickness direction of the TiN layer, and the concentration distribution includes a region where the concentration of the element decreases in a direction from the base material toward a surface of the coating.

First claim

The invention claimed is:

1. A surface-coated cutting tool comprising a base material and a coating formed on the base material,
said coating including one or two or more layers,
a layer among said layers that abuts on said base material being a TiN layer,
said TiN layer containing at least one element together with TiN,
said element being C,
said C having a concentration distribution in a thickness direction of said TiN layer,
said concentration distribution including a region where the concentration of said C decreases in a direction from said base material toward a surface of said coating, and
said concentration distribution having a difference between a maximum concentration and a minimum concentration of said C of 10 atomic % or more.

2. The surface-coated cutting tool according to claim 1 , wherein said C has a maximum concentration of 30 atomic % or less.

3. The surface-coated cutting tool according to claim 1 , wherein said concentration distribution has a distribution where the concentration of said C decreases in the direction from said base material, then reaches a local minimum, and thereafter increases in the direction toward the surface of said coating.

4. The surface-coated cutting tool according to claim 1 , wherein said TiN layer has a thickness of 0.1 to 0.5 μm.

5. The surface-coated cutting tool according to claim 1 , wherein
said coating includes a TiCN layer located directly on said TiN layer,
said TiCN layer contains TiCN, and
C in said TiCN layer has a maximum concentration of 20 atomic % or more.

6. The surface-coated cutting tool according to claim 1 , wherein
said coating further includes another layer, and
said another layer is one or more layers made of a compound of at least one element selected from the group consisting of group 4 elements, group 5 elements, and group 6 elements in the periodic table, Al, and Si and at least one element selected from the group consisting of boron, carbon, nitrogen, and oxygen.

7. The surface-coated cutting tool according to claim 1 , wherein said coating is formed by chemical vapor deposition.

8. The surface-coated cutting tool according to claim 1 , wherein said base material is a cemented carbide.

9. The surface-coated cutting tool according to claim 1 , wherein
said base material is made of a cemented carbide,
said TiN layer contains C and Co together with TiN,
said C and said Co each have a concentration distribution in the thickness direction of said TiN layer,
the concentration distribution of said C includes a region where the concentration of said C decreases in the direction from said base material toward the surface of said coating, and
the concentration distribution of said Co includes a region where the concentration of said Co decreases in the direction from said base material toward the surface of said coating.

10. A surface-coated tool comprising a base material and a coating formed on the base material,
said coating including one or two or more layers,
a layer among said layers that abuts on said base material being a TiN layer,
said base material being made of a cemented carbide,
said TiN layer containing C and Co together with TiN,
said C and said Co each having a concentration distribution in a thickness direction of said TiN layer,
the concentration distribution of said C including a region where the concentration of said C decreases in a direction from said base material toward the surface of said coating,
the concentration distribution of said Co including a region where the concentration of said Co decreases in a direction from said base material toward the surface of said coating, and
the concentration distribution of said C having a difference between a maximum concentration and a minimum concentration of said C of 10 atomic % or more.

11. The surface-coated cutting tool according to claim 10 , wherein said C and said Co in said TiN layer have an atomic ratio that said C is twice or more as high as said Co.

12. The surface-coated cutting tool according to claim 9 , wherein the concentration distribution of said C has a difference between a maximum concentration and a minimum concentration of said C of 10 atomic % or more.

13. The surface-coated cutting tool according to claim 10 , wherein
said C has a maximum concentration of 30 atomic % or less, and
said Co has a maximum concentration of 5 atomic % or less.

14. The surface-coated cutting tool according to claim 10 , wherein
the concentration distribution of said C has a distribution where the concentration of said C decreases in the direction from said base material, then reaches a local minimum, and thereafter increases in the direction toward the surface of said coating, and
the concentration distribution of said Co has a distribution where the concentration of said Co decreases in the direction from said base material toward the surface of said coating.

15. The surface-coated cutting tool according to claim 10 , wherein said TiN layer has a thickness of 0.1 to 0.5 μm.

16. The surface-coated cutting tool according to claim 10 , wherein
said coating includes a TiCN layer located directly on said TiN layer,
said TiCN layer contains TiCN, and
C in said TiCN layer has a maximum concentration of 20 atomic % or more.

17. The surface-coated cutting tool according to claim 10 , wherein
said coating further includes another layer, and
said another layer is one or more layers made of a compound of at least one element selected from the group consisting of group 4 elements, group 5 elements, and group 6 elements in the periodic table, Al, and Si and at least one element selected from the group consisting of boron, carbon, nitrogen, and oxygen.

18. The surface-coated cutting tool according to claim 10 , wherein said coating is formed by chemical vapor deposition.

Assignees

• Sumitomo Electric Hardmetal Corp

Inventors

• Imamura Shinya
• Ichikawa Takahiro
• Okuno Susumu
• Kanaoka Hideaki
• Tsuda Keiichi

Classifications

• B23C2224/32

  Titanium carbide nitride (TiCN) · CPC title

• C23C16/36

  Carbonitrides · CPC title

• B23B27/14 Primary

  Cutting tools of which the bits or tips {or cutting inserts} are of special material · CPC title

• B23B2224/36

  Titanium nitride · CPC title

• C23C16/34

  Nitrides {(C23C16/303 takes precedence)} · CPC title