Coated cutting tool

Patent metadata

Field	Value
Publication number	US-10857598-B2
Application number	US-201816116084-A
Country	US
Kind code	B2
Filing date	Aug 29, 2018
Priority date	Sep 14, 2017
Publication date	Dec 8, 2020
Grant date	Dec 8, 2020

Abstract

A coated cutting tool, comprising: a substrate; and a coating layer formed on the substrate, wherein the coating layer includes a lower part layer and an upper part layer formed on the lower part layer, the lower part layer has an average thickness of 2.0 μm or more and 15.0 μm or less, and is formed of a Ti oxycarbonitride layer including a compound having a composition represented by formula (1) below:

Ti(C 1-x-y N x O y )  (1)

(where, x denotes an atomic ratio of an N element based on a total of a C element, the N element, and an O element, y denotes an atomic ratio of the O element based on a total of the C element, the N element, and the O element, and 0.35≤x≤0.60 and 0.01≤y≤0.10 are satisfied),

a FWHM of a rocking curve of a plane (4,2,2) of the lower part layer, which is obtained through X-ray diffraction, is 20° or less, the upper part layer is formed of an α-aluminum oxide layer having an average thickness of 1.0 μm or more and 15.0 μm or less, and a FWHM of a rocking curve of a plane (0,0,12) of the upper part layer, which is obtained through X-ray diffraction, is 20° or less.

First claim

What is claimed is:

1. A coated cutting tool, comprising:
a substrate; and
a coating layer formed on the substrate, wherein
the coating layer includes a lower part layer and an upper part layer formed on the lower part layer,
the lower part layer has an average thickness of 2.0 μm or more and 15.0 μm or less, and is formed of a Ti oxycarbonitride layer including a compound having a composition represented by formula (1) below:
Ti(C 1-x-y N x O y )  (1)

(where, x denotes an atomic ratio of an N element based on a total of a C element, the N element, and an O element, y denotes an atomic ratio of the O element based on a total of the C element, the N element, and the O element, and 0.35≤x≤0.60 and 0.01≤y≤0.10 are satisfied),
a full width at half maximum of a rocking curve of a plane (4,2,2) of the lower part layer, which is obtained through X-ray diffraction, is 20° or less,
the upper part layer is formed of an α-aluminum oxide layer having an average thickness of 1.0 μm or more and 15.0 μm or less, and
a full width at half maximum of a rocking curve of a plane (0,0,12) of the upper part layer, which is obtained through X-ray diffraction, is 18° or less.

2. The coated cutting tool according to claim 1 , wherein each of particles forming the lower part layer has an average particle size of 0.5 μm or more and 1.5 μm or less.

3. The coated cutting tool according to claim 1 , wherein
the coating layer includes, between the lower part layer and the upper part layer, an intermediate layer formed of a Ti compound layer including a compound having a composition represented by formula (2) below:
Ti(C 1-a-b N a O b )  (2)

(where, a denotes the atomic ratio of the N element based on a total of the C element, the N element, and the O element, b denotes the atomic ratio of the O element based on a total of the C element, the N element, and the O element, and 0.00≤a≤0.30 and 0.01≤b≤0.10 are satisfied), and
the intermediate layer has an average thickness of 0.05 μm or more and 1.50 μm or less.

4. The coated cutting tool according to claim 1 , wherein
the coating layer includes a lowermost layer formed of a Ti nitride layer or a Ti carbide layer between the substrate and the lower part layer, and
the lowermost layer has an average thickness of 0.1 μm or more and 1.5 μm or less.

5. The coated cutting tool according to claim 1 , wherein the entire coating layer has an average thickness of 3.0 μm or more and 25.0 μm or less.

6. The coated cutting tool according to claim 1 , wherein the substrate is one of a cemented carbide, cermet, ceramics, and a cubic boron nitride sintered body.

7. The coated cutting tool according to claim 2 , wherein
the coating layer includes, between the lower part layer and the upper part layer, an intermediate layer formed of a Ti compound layer including a compound having a composition represented by formula (2) below:
Ti(C 1-a-b N a O b )  (2)

(where, a denotes the atomic ratio of the N element based on a total of the C element, the N element, and the O element, b denotes the atomic ratio of the O element based on a total of the C element, the N element, and the O element, and 0.00≤a≤0.30 and 0.01≤b≤0.10 are satisfied), and
the intermediate layer has an average thickness of 0.05 μm or more and 1.50 μm or less.

8. The coated cutting tool according to claim 2 , wherein
the coating layer includes a lowermost layer formed of a Ti nitride layer or a Ti carbide layer between the substrate and the lower part layer, and
the lowermost layer has an average thickness of 0.1 μm or more and 1.5 μm or less.

9. The coated cutting tool according to claim 3 , wherein
the coating layer includes a lowermost layer formed of a Ti nitride layer or a Ti carbide layer between the substrate and the lower part layer, and
the lowermost layer has an average thickness of 0.1 μm or more and 1.5 μm or less.

10. The coated cutting tool according to claim 7 , wherein
the coating layer includes a lowermost layer formed of a Ti nitride layer or a Ti carbide layer between the substrate and the lower part layer, and
the lowermost layer has an average thickness of 0.1 μm or more and 1.5 μm or less.

11. The coated cutting tool according to claim 2 , wherein the entire coating layer has an average thickness of 3.0 μm or more and 25.0 μm or less.

12. The coated cutting tool according to claim 3 , wherein the entire coating layer has an average thickness of 3.0 μm or more and 25.0 μm or less.

13. The coated cutting tool according to claim 4 , wherein the entire coating layer has an average thickness of 3.0 μm or more and 25.0 μm or less.

14. The coated cutting tool according to claim 7 , wherein the entire coating layer has an average thickness of 3.0 μm or more and 25.0 μm or less.

15. The coated cutting tool according to claim 8 , wherein the entire coating layer has an average thickness of 3.0 μm or more and 25.0 μm or less.

16. The coated cutting tool according to claim 9 , wherein the entire coating layer has an average thickness of 3.0 μm or more and 25.0 μm or less.

17. The coated cutting tool according to claim 10 , wherein the entire coating layer has an average thickness of 3.0 μm or more and 25.0 μm or less.

18. The coated cutting tool according to claim 2 , wherein the substrate is one of a cemented carbide, cermet, ceramics, and a cubic boron nitride sintered body.

19. The coated cutting tool according to claim 3 , wherein the substrate is one of a cemented carbide, cermet, ceramics, and a cubic boron nitride sintered body.

20. The coated cutting tool according to claim 4 , wherein the substrate is one of a cemented carbide, cermet, ceramics, and a cubic boron nitride sintered body.

Assignees

• Tungaloy Corp

Inventors

• Satoh Hiroyuki
• Takahashi Kinya

Classifications

• C23C16/36 Primary

  Carbonitrides · CPC title

• C23C30/005

  on hard metal substrates · CPC title

• C23C28/044

  coatings specially adapted for cutting tools or wear applications · CPC title

• C23C16/32

  Carbides · CPC title

• C23C16/029

  Graded interfaces · CPC title