Coated cutting tool

Patent metadata

Field	Value
Publication number	US-RE49475-E
Application number	US-201416863739-A
Country	US
Kind code	E1
Filing date	Jun 13, 2014
Priority date	Jun 14, 2013
Publication date	Mar 28, 2023
Grant date	Mar 28, 2023

Abstract

A coated cutting tool having a substrate and a surface coating, wherein the coating includes a Ti(C,N) layer of at least one columnar fine-grained MTCVD Ti(C,N) layer with an average grain width of 0.05-0.2 μm and an atomic ratio of carbon to the sum of carbon and nitrogen (C/(C+N)) contained in the MTCVD Ti(C,N) layer is in average 0.50-0.65.

First claim

The invention claimed is:

1. A coated cutting tool comprising: a substrate;
a surface coating disposed on the substrate, wherein said coating includes a Ti(C,N) layer comprising at least one columnar MTCVD Ti(C,N) layer with an average grain width of 0.05-0.5μm, measured on a cross section with a surface normal perpendicular to a surface normal of the substrate, on a rake face of said coated cutting tool, along a straight line in a direction parallel to a surface of the substrate, at a centered position between a lowermost and an uppermost interface of said columnar MTCVD Ti(C,N) layer, an atomic ratio of carbon to the sum of carbon and nitrogen (C/(C+N)) contained in said MTCVD Ti(C,N) layer is in average 0.50-0.65, wherein said MTCVD Ti(C,N) layer exhibits an X-ray diffraction pattern, as measured using CuKα radiation, wherein the texture coefficients TC(hkl) are defined as

TC
⁡
(
hkl
)

=

I
⁡
(
hkl
)

I
0

(

h
⁢
k
⁢
l

)

[

1
n

⁢

∑

n
=
1

n

I
⁡
(
hkl
)

I
0

(
hkl
)

]

-
1

where I(hkl) =measured intensity (peak area) of the (hkl) reflection,
I 0 (hkl)=standard intensity according to ICDD's PDF-card No. 42-1489,
n=number of reflections used in the calculation,
(hkl) reflections used are: (111),(200),(220),(311),(331),(420),(422)and (511), and
a sum of TC(422) and TC(311) is less than or equal to 5.5; and
an Al 2 O 3 layer deposited above said Ti(C,N,O) Ti(C,N) layer.

2. The coated cutting tool according to claim 1 , wherein the average grain width is 0.1-0.2μm.

3. The coated cutting tool according to claim 1 , wherein the C/(C+N) ratio is 0.54-0.56.

4. The coated cutting tool according to claim 1 , wherein an average thicknesses of said columnar MTCVD Ti(C,N) layer is 2-7μm.

5. The coated cutting tool according to claim 4 , wherein said Al 2 O 3 layer is an α-Al 2 O 3 layer that exhibits an X-ray diffraction pattern, as measured using CuKαradiation, wherein the texture coefficients TC(hkl) are defined as

TC
⁡
(
hkl
)

=

I
⁡
(
hkl
)

I
0

(

h
⁢
k
⁢
l

)

[

1
n

⁢

∑

n
=
1

n

I
⁡
(
hkl
)

I
0

(
hkl
)

]

-
1

where I(hkl) =measured intensity (peak area) of the (hkl) reflection
I 0 (hkl)=standard intensity according to ICDD's PDF-card No. 10-0173
n=number of reflections used in the calculation.

6. The coated cutting tool according to claim 5 , wherein the TC(104) for the α-Al 2 O 3 layer is higher than 1.5, when the (hkl) reflections used are (104), (110), (113), (024), (116), (214), (300) and (0 0 12).

7. The coated cutting tool according to claim 5 , wherein the TC(110) for the α-Al 2 O 3 layer is higher than 1.5, when the (hkl) reflections used are (104), (110), (113), (024), (116), (214), (300) and (0 0 12).

8. The coated cutting tool according to claim 5 , wherein the TC(024) for the α-Al 2 O 3 layer is higher than 1.5, when the (hkl) reflections used are (104), (110), (113), (024), (116), (214), (300) and (0 0 12).

9. The coated cutting tool according to claim 5 , wherein the TC(116) for the α-Al 2 O 3 layer is higher than 1.5, when the (hkl) reflections used are (104), (110), (113), (024), (116), (214), (300) and (0 0 12).

10. The coated cutting tool according to claim 5 , wherein the TC(0 0 12) for the α-Al 2 O 3 layer is higher than 1.5, when the (hkl) reflections used are (104), (110), (113), (024), (116), (214), (300) and (0 0 12).

11. The coated cutting tool according to claim 5 , wherein the sum of TC(104) and TC(0 0 12) for the α-Al 2 O 3 layer is higher than 4, when the (hkl) reflections used are (104), (110), (113), (024), (116), (214), (300) and (0 0 12).

12. The coated cutting tool according to claim 1 , wherein the Al 2 O 3 layer has an average thickness of 1-8μm.

13. The coated cutting tool according to claim 1 , wherein the insert has been subjected to a brushing treatment of the cutting edge and/or a blasting treatment.

14. The c

Assignees

• Sandvik Intellectual Property

Inventors

• Bjormander Carl

Classifications

• B24D3/34 Primary

  characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties · CPC title

• C23C16/36

  Carbonitrides · CPC title

• C23C30/005

  on hard metal substrates · CPC title