Coated cutting tool

Patent metadata

Field	Value
Publication number	US-10954590-B2
Application number	US-201716311715-A
Country	US
Kind code	B2
Filing date	Jun 30, 2017
Priority date	Jul 1, 2016
Publication date	Mar 23, 2021
Grant date	Mar 23, 2021

Abstract

A coated cutting tool includes a body and a hard and wear resistant coating on the body. The coating has at least one NbN layer with a thickness between 0.2 μm and 15 μm, wherein the NbN layer includes a phase mixture of a cubic phase, c-NbN, and a hexagonal phase, h-NbN.

First claim

The invention claimed is:

1. A coated cutting tool comprising:
a body; and
a hard and wear resistant PVD coating on the body, the coating having at least one NbN layer with a thickness between 0.2 μm and 15 μm and a (Ti 1-x Al x )N y layer arranged between the body and the NbN layer, the (Ti1-xAlx)Ny layer being a cubic c-(Ti1-xAlx)Ny layer where 0.4<x<0.7 and 0.7<y<1.1, and wherein the NbN layer is a phase mixture of a cubic phase, c-NbN, and a hexagonal phase, h-NbN, with a X-ray diffraction peak area ratio of 0.64<R 0 <1, where R 0 =I c-NbN(200) /(I c-NbN(200) +I h-NbN(100) ), and I c-NbN(200) and I h-NbN(100) are the X-ray diffraction peak areas as extracted from the pseudo-Voigt peak profile fitting results of θ-2θ scans obtained with Cu—K α -radiation for the c-NbN (200) and h-NbN (100) diffraction peaks, respectively.

2. The coated cutting tool according to claim 1 , wherein the cubic phase c-NbN has a crystallographic orientation of 0.2<R 2 ≤1, where R 2 =I c-NbN(200) /(I c-NbN(200) +I c-NbN(111) ), and I c-NbN(200) and I c-NbN(111) are the X-ray diffraction peak areas as extracted from the pseudo-Voigt peak profile fitting results of θ-2θ scans obtained with Cu—K α -radiation for the c-NbN (200) and c-NbN (111) diffraction peaks, respectively.

3. The coated cutting tool according to claim 2 , wherein the peak area ratio R 2 is 0.4<R 2 ≤1.

4. The coated cutting tool according to claim 2 , wherein the peak area ratio R 2 is 0.6<R 2 ≤1.

5. The coated cutting tool according to claim 1 , wherein the NbN layer has a crystallographic orientation relation of 0.5<R 1 ≤1, where R 1 =I c-NbN(200) /(I c-NbN(200) +I h-NbN(101) ), and where I c-NbN(200) and I h-NbN(101) are the X-ray diffraction peak areas as extracted from the pseudo-Voigt peak profile fitting results of θ-2θ scans obtained with Cu—K α -radiation for the c-NbN (200) and h-NbN (101) diffraction peaks, respectively.

6. The coated cutting tool according to claim 5 , wherein the peak area ratio R 1 is 0.7<R 1 ≤1.0.

7. The coated cutting tool according to claim 1 , wherein the c-(Ti 1-x Al x )N y layer and the NbN layer has a thickness ratio d c-(Ti 1-x Al x )N y :d NbN of 2:3<d c-(Ti 1-x Al x )N y :d NbN <6:1, preferably 1:1<d c-(Ti 1-x Al x )N y :d NbN <5:1.

8. The coated cutting tool according to claim 1 , wherein the cubic c-(Ti 1-x Al x )N y layer contains less than 5 at % of cubic c-TiN, cubic c-AlN and hexagonal h-AlN phases.

9. The coated cutting tool according to claim 1 , wherein the c-(Ti 1-x Al x )N y layer has a crystallographic orientation relation of 0.5<R 7 ≤1, where R 7 =I c-(Ti 1-x Al x )N y (200) /(I c-(Ti 1-x Al x )N y (200) +I c-(Ti 1-x Al x )N y (111) ), and I c-(Ti 1-x Al x )N y (200) and I c-(Ti 1-x Al x )N y (111) ) are the X-ray diffraction peak areas as extracted from the pseudo-Voigt peak profile fitting results of θ-2θ scans obtained with Cu—K α -radiation for the c-(Ti 1-x Al x )N y (200) and c-(Ti 1-x Al x )N y (111) diffraction peaks, respectively.

10. The coated cutting tool according to claim 9 , wherein the peak area ratio R 7 is 0.6<R 7 ≤1.

11. The coated cutting tool according to claim 1 , wherein the coated cutting tool is a drill or end-mill for machining by chip removal, and the body is a hard alloy of cemented carbide, cermet, ceramics, cubic boron nitride based material or high speed steel.

Assignees

• Seco Tools Ab

Inventors

• Andersson Jon
• Johansson Joesaar Mats

Classifications

• B23B2226/12

  Boron nitride · CPC title

• B23C5/02

  characterised by the shape of the cutter · CPC title

• B23B2226/18

  Ceramic · CPC title

• B23B2228/10

  Coatings · CPC title

• C23C14/024

  Deposition of sublayers, e.g. to promote adhesion of the coating (C23C14/027 takes precedence) · CPC title