Coated cutting tool

Patent metadata

Field	Value
Publication number	US-9463513-B2
Application number	US-201414315463-A
Country	US
Kind code	B2
Filing date	Jun 26, 2014
Priority date	Jun 27, 2013
Publication date	Oct 11, 2016
Grant date	Oct 11, 2016

Abstract

A coated cutting tool comprising substrate and a coating, wherein the coating comprises a layer of MTCVD TiCN, and a layer of α-Al 2 O 3 , wherein the α-Al 2 O 3 layer exhibits an X-ray diffraction pattern, as measured using CuKα radiation, the (hkl) reflections used are (012), (104), (110), (113), (116), (300), (214) and (0 0 12), and the TC(0 0 12) is higher than 5 and a full width half maximum (FWHM) of a rocking curve peak of the (0 0 12) plane of the α-Al 2 O 3 is lower than 30°.

First claim

The invention claimed is:

1. A coated cutting tool comprising:
a substrate; and
a coating, the coating including a layer of MTCVD TiCN, and a layer of α-Al 2 O 3 , wherein the α-Al 2 O 3 layer exhibits an X-ray diffraction pattern, as measured using CuKα radiation and θ-2θ scan, wherein a texture coefficient TC(hkl) is defined according to the Harris formula

TC
⁡

(
hkl
)

=

I
⁡

(
hkl
)

I
0

⁡

(
hkl
)

⁡

[

1
n

⁢

∑

n
=
1

n

⁢

⁢

I
⁡

(
hkl
)

I
0

⁡

(
hkl
)

]

-
1

where I(hkl)=measured intensity (integrated area) of the (hkl) reflection,
I 0 (hkl)=standard intensity according to ICDD's PDF-card No. 00-010-0173,
n=number of reflections used in the calculation, and the
(hkl) reflections used are (012), (104), (110), (113), (116), (300), (214) and (0 0 12),

and wherein TC(0 0 12) is higher than 5, and wherein a full width half maximum (FWHM) of a rocking curve peak of a (0 0 12) plane of the α-Al 2 O 3 using X-ray diffraction as measured on a clearance face of the cutting tool is FWHM lower than 30°, and wherein the TiCN layer exhibits an X-ray diffraction pattern, as measured using CuKα radiation, wherein the relation between the integrated area intensity of a 220 peak and the integrated area intensity of a 311 peak, I 220 /I 311 , is lower than 3.

2. The cutting tool in accordance with claim 1 , wherein a difference A between the FWHM of a (0 0 12) diffraction peak in an X-ray diffraction of the α-Al 2 O 3 layer on a rake face of the cutting tool and the FWHM of the (0 0 12) diffraction peak in an X-ray diffraction of the α-Al 2 O 3 on the clearance face of the cutting tool is Δ>0.2.

3. The cutting tool in accordance with claim 2 , wherein a difference Δ>0.3.

4. The cutting tool in accordance with claim 2 , wherein a difference Δ>0.4.

5. The cutting tool in accordance with claim 1 , wherein a difference A between the FWHM of the (0 0 12) diffraction peak in an X-ray diffraction of the α-Al 2 O 3 layer and the FWHM of the (0 0 12) diffraction peak in an X-ray diffraction of the cutting tool after heat treatment in 1030° C. in N 2 for 3 hours is Δ>0.2.

6. The cutting tool in accordance with claim 5 , wherein a difference Δ>0.3.

7. The cutting tool in accordance with claim 5 , wherein a difference Δ>0.4.

8. The cutting tool in accordance with claim 1 , wherein the α-Al 2 O 3 layer is 2-15 μm.

9. The cutting tool in accordance with claim 8 , wherein the α-Al 2 O 3 layer is 3-7 μm.

10. The cutting tool in accordance with claim 8 , wherein the α-Al 2 O 3 layer is 4-6 μm.

11. The cutting tool in accordance with claim 1 , wherein the TiCN layer is 2-15 μm.

12. The cutting tool in accordance with claim 11 , wherein the TiCN layer is 5-12 μm.

13. The cutting tool in accordance with claim 11 , wherein the TiCN layer is 7-11 μm.

14. The cutting tool in accordance with claim 1 , further comprising a 1-2 μm thick bonding layer between the MTCVD TiCN layer and the layer of α-Al 2 O 3 .

15. The cutting tool in accordance with claim 1 , wherein TC(0 0 12) is higher than claim 6 .

16. The cutting tool in accordance with claim 1 , wherein TC(0 0 12) is higher than claim 7 .

17. The cutting tool in accordance with claim 1 , wherein a full width half maximum (FWHM) of a rocking curve peak of the (0 0 12) plane of the α-Al 2 O 3 using X-ray diffraction as measured on the clearance face of the cutting tool is FWHM lower than 26°.

18. The cutting tool in accordance with claim 1 , wherein a full width half maximum (FWHM) of a rocking curve peak of the (0 0 12) plane of the α-Al 2 O 3 using X-ray diffraction as measured on the clearance face of the cutting tool is FWHM lower than 22°.

19. The cutting tool in accordance with claim 1 , wherein the relation between the integrated area intensity of the 220 peak and the integrated area intensity of the 311 peak, I 220 /I 311 , is lower than 2.

20. The cutting tool in accordance with claim 1 , wherein the relation between the integrated area intensity of the 220 peak and the integrated area intensity of the 311 peak, I 220 /I 311 , is lower than 1.

Assignees

• Sandvik Intellectual Property

Inventors

• Östlund Åke
• Edman Jonny
• Lindahl Erik
• Engqvist Jan

Classifications

• C23C16/36

  Carbonitrides · CPC title

• C23C16/0272

  Deposition of sub-layers, e.g. to promote the adhesion of the main coating · CPC title

• C23C30/005

  on hard metal substrates · CPC title

• C23C16/56

  After-treatment · CPC title

• C23C16/403

  of aluminium, magnesium or beryllium · CPC title