Cvd coated cutting tool

Patent metadata

Field	Value
Publication number	US-2016175940-A1
Application number	US-201514975626-A
Country	US
Kind code	A1
Filing date	Dec 18, 2015
Priority date	Dec 19, 2014
Publication date	Jun 23, 2016
Grant date	—

Abstract

A coated cutting tool for chip forming machining of metals includes a substrate having a surface coated with a chemical vapour deposition (CVD) coating. The coating has a layer of α-Al 2 O 3 , wherein the α-Al 2 O 3 layer exhibits a texture coefficient TC(0 0 12)≧7.2 and wherein the ratio of I(0 0 12)/I(0 1 14) is ≧1.

First claim

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

TC


(
hkl
)

=

I


(
hkl
)

I
0



(
hkl
)



[

1
n



∑

n
=
1

n





I


(
hkl
)

I
0



(
hkl
)

]

-
1

wherein I(hkl) is the measured intensity (integrated area) of the (hkl) reflection,
I 0 (hkl) is the standard intensity according to ICDD's PDF-card No. 00-010-0173, n is the number of reflections used in the calculation, and where the (hkl) reflections used are (1 0 4), (1 1 0), (1 1 3), (024), (1 1 6), (2 1 4), (3 0 0) and (0 0 12);
TC(0 0 12) is ≧7.2;
and wherein the ratio of I(0 0 12)/I(0 1 14) is ≧1.

2 . The coated cutting tool according to claim 1 , wherein the thickness of the α-Al 2 O 3 layer is 2-20 μm.

3 . The coated cutting tool according to claim 1 , wherein the coating further comprises an MTCVD TiCN layer located between the substrate and the α-Al 2 O 3 layer.

4 . The coated cutting tool according to claim 3 , wherein the thickness of the MTCVD TiCN layer is 4-20 μm.

5 . The coated cutting tool according to claim 1 , wherein the coating further comprises a bonding layer including an HTCVD deposited TiN, TiCN, TiCNO and/or TiCO or a combination thereof, wherein the HTCVD TiCN and TiCNO are located outermost of the MTCVD TiCN layer and adjacent to the α-Al 2 O 3 layer.

6 . The coated cutting tool according to claim 5 , wherein the thickness of the bonding layer is 0.5-2 μm.

7 . The coated cutting tool according to claim 3 , wherein the TiCN layer located between the α-Al 2 O 3 layer and the substrate exhibits a texture coefficient TC(hkl), as measured by X-ray diffraction using CuKα radiation and θ-2θ scan, defined according to Harris formula where I(hkl) is the measured intensity (integrated area) of the (hkl) reflection, I 0 (hkl) is the standard intensity according to ICDD's PDF-card No. 42-1489, n is the number of reflections, reflections used in the calculation are (1 1 1), (2 0 0), (2 2 0), (3 1 1), (3 3 1), (4 2 0), (4 2 2) and (5 1 1), TC(2 2 0) is <0.5.

8 . The coated cutting tool according to claim 7 , wherein the TiCN layer exhibits a TC(4 2 2)≧3.

9 . The coated cutting tool according to claim 7 , wherein the TC(3 1 1)+TC(4 2 2) of the TiCN layer is ≧4.

10 . The coated cutting tool according to claim 1 , wherein the substrate is selected from cemented carbide, cermet, ceramic.

Assignees

• Sandvik Intellectual Property

Inventors

• Lindahl Erik
• Engqvist Jan

Classifications

• B23B2224/32

  Titanium carbide nitride (TiCN) · CPC title

• B23B27/148 Primary

  Composition of the cutting inserts · CPC title

• C23C28/044

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

• C23C28/042

  including a refractory ceramic layer, e.g. refractory metal oxides, ZrO2, rare earth oxides · CPC title

• B23B2222/28

  Details of hard metal, i.e. cemented carbide · CPC title