Coated cutting tool

Patent metadata

Field	Value
Publication number	US-2016136786-A1
Application number	US-201414897762-A
Country	US
Kind code	A1
Filing date	Jun 13, 2014
Priority date	Jun 14, 2013
Publication date	May 19, 2016
Grant date	—

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

1 . A coated cutting tool comprising a substrate and a surface coating, wherein said coating included a Ti(C,N) layer comprising at least one columnar MTCVD Ti(C,N) layer with an average grain width of 0.05-0.5 μm, 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, characterized in that 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



(
hkl
)



[

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.

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

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 2-7 μm.

5 . The coated cutting tool according to claim 1 , further comprising an Al 2 O 3 layer.

6 . 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 CuKα radiation, wherein the texture coefficients TC(hkl) are defined as

TC


(
hkl
)

=

I


(
hkl
)

I
0



(
hkl
)



[

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.

7 . The coated cutting tool according to claim 6 , 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).

8 . The coated cutting tool according to claim 6 , 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).

9 . The coated cutting tool according to claim 6 , 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).

10 . The coated cutting tool according to claim 6 , wherein the TC(116) for the α-Al 2 O 3 layer is higher than 1.

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

• C23C30/005

  on hard metal substrates · CPC title

• C23C16/36

  Carbonitrides · CPC title