Coated cutting tool and a method for coating the cutting tool

Patent metadata

Field	Value
Publication number	US-10023952-B2
Application number	US-201314916145-A
Country	US
Kind code	B2
Filing date	Sep 5, 2013
Priority date	Sep 5, 2013
Publication date	Jul 17, 2018
Grant date	Jul 17, 2018

Abstract

A coated cutting tool and a hard and wear resistant coating for a body include at least one metal based nitride layer. The layer is (ZrxCrl-x-y-zAlyMez)Na with 0.55<x<0.85, 0.05<y<0.45, 0≤z<0.20, 0.95<a<1.10, and Me is one or more of the elements: Y, Ti, V, Nb, Ta, Mo, W, Mn or Si. The layer can have a thickness between 0.5 μm and 15 μm and be comprisied of a single cubic phase or a single hexagonal phase or a mixture thereof. In an exemplary embodiment, the layer is a cubic phase of a sodium chloride structure. The layer can be deposited using cathodic arc evaporation and is useful for metal cutting applications generating high temperatures.

First claim

The invention claimed is:

1. A coated cutting tool comprising:
a body; and
a hard and wear resistant coating on the body, the coating comprising at least one metal based nitride layer, wherein said layer is (Zr x Cr 1-x-y Al y )N a with 0.60<x<0.80, 0.05<y<0.20, 0.95<a<1.10, and that the layer has a single cubic phase or a single hexagonal phase or a mixture thereof or a cubic phase of a sodium chloride structure, and that the layer has a thickness between 0.5 μm and 15 μm.

2. The coated cutting tool according to claim 1 , wherein 0.65<x<0.75.

3. The coated cutting tool according to claim 1 , wherein said at least one metal based nitride layer has a thickness between 0.5 μm and 10 μm.

4. The coated cutting tool according to claim 1 , wherein said at least one metal based nitride layer has a nanohardness >20 GPa.

5. The coated cutting tool according to claim 4 , wherein said at least one metal based nitride layer has a nanohardness between 25 GPa and 40 GPa.

6. The coated cutting tool according to claim 1 , wherein said coating includes an innermost single layer of TiN, and the coating has a total coating thickness between 1 μm and 20 μm.

7. The coated cutting tool according to claim 1 , wherein said coated cutting tool is a cutting insert for machining by chip removal, the body being selected from a group of hard alloy of cemented carbide, cermet, ceramics, cubic boron nitride and high speed steel.

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

9. The coated cutting tool according to claim 1 , wherein said coating includes a multilayer comprising, TiN, TiC, Ti(C,N) or (Ti,Al)N, and the coating has a total coating thickness between 1 μm and 20 μm.

10. The coated cutting tool according to claim 1 , wherein said coating includes a multilayer comprising preferably a single layer of (Ti,Al)N, followed by the (Zr,Cr,A 1 )N layer and an outer single layer of TiN, the coating has a total coating thickness between 1 μm and 20 μm.

11. A method of making a coated cutting tool, comprising the steps of:
growing a metal based nitride layer on a body by cathodic arc evaporation with an evaporation current between 50 A and 200 A using composite and/or alloyed cathodes, wherein said layer is (Zr x Cr 1-x-y Al y )Na with 0.60<x<0.80, 0.05<y0.20, 0.95<a<1.10, in a reactive atmosphere containing N 2 and optionally with a carrier gas such as, e.g., Ar at a total gas pressure between 1.0 Pa and 7.0 Pa, with a negative substrate bias between 0 V and 300 V, and at a temperature between 200° C. and 800° C.

Assignees

• Seco Tools Ab

Inventors

• Oden Magnus
• Forsen Rikard
• Johansson-Joesaar Mats
• Bilal Syed Muhammad
• Ghafoor Naureen

Classifications

• G02B13/06

  Panoramic objectives; So-called "sky lenses" {including panoramic objectives having reflecting surfaces} · CPC title

• B23C2228/10

  Coating · CPC title

• B23B27/148

  Composition of the cutting inserts · CPC title

• C23C28/042

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

• G03B37/06

  involving anamorphosis (G03B37/02, G03B37/04 take precedence) · CPC title