Cutting tool comprising a multiple-ply pvd coating

Patent metadata

Field	Value
Publication number	US-2018223436-A1
Application number	US-201515524551-A
Country	US
Kind code	A1
Filing date	Oct 20, 2015
Priority date	Nov 5, 2014
Publication date	Aug 9, 2018
Grant date	—

Abstract

A tool includes a substrate of hard metal, cermet, ceramic, steel or high speed steel, and a multiple-ply coating. The multiple-ply coating includes a connecting layer and a wear-resistant layer deposited directly onto the connecting layer. The connecting layer has a multiple-ply design. Plies of the connecting layer, which lie one immediately over the other, have different compositions formed from carbides, nitrides, oxides, carbonitrides, oxycarbides, carboxy nitrides of at least two different metals selected from Ti, V, Cr, Zr, Nb, Mo, Ru, Hf, Ta, W, Al, Si, Y, Li and B, and solid solutions thereof. The wear-resistant layer has a single or multiple-ply design. Each of the plies of the wear-resistant layer are formed from carbides, nitrides, oxides, carbonitrides, oxycarbides, carboxy nitrides of at least two different metals selected from Ti, V, Cr, Zr, Nb, Mo, Ru, Hf, Ta, W, Al, Si, Y, Li and B and solid solutions thereof.

First claim

1 . A tool comprising:
a substrate selected from a hard metal, cermet, ceramic, steel or high-speed steel; and a multi-layer coating disposed on the substrate via a PVD method and having a total thickness of 1 μm to 20 μm, wherein the multi-layer coating includes a bonding layer and an anti-wear protective layer deposited directly onto the bonding layer, wherein the bonding layer is deposited by cathodic vacuum arc vapor deposition (arc PVD) and has a multi-layer design, wherein layers of the bonding layer which are arranged directly one over the other and have different compositions, and wherein the multiple layers of the bonding layer are each formed from carbides, nitrides, oxides, carbonitrides, oxicarbides, carboxinitrides of at least two different metals selected from Ti, V, Cr, Zr, Nb, Mo, Ru, Hf, Ta, W, Al, Si, Y, Li and B, and solid solutions thereof, and wherein the anti-wear protective layer is deposited by high-power impulse magnetron sputtering (HIPIMS) and has a single-layer or multi-layer design, wherein the one or more layers of the anti-wear protective layer are each formed from carbides, nitrides, oxides, carbonitrides, oxicarbides, carboxinitrides of at least two different metals selected from Ti, V, Cr, Zr, Nb, Mo, Ru, Hf, Ta, W, Al, Si, Y, Li and B, and solid solutions thereof.

2 . The tool according to claim 1 , wherein the layers of the bonding layer are each formed from nitrides or carbonitrides of at least two different metals selected from Ti, Al, Si, and Cr.

3 . The tool according to claim 1 , wherein the multi-layer bonding layer has at least 4 layers arranged one over the other.

4 . The tool according to claim 1 , wherein within the multi-layer bonding layer the Vickers hardness increases perpendicular to a surface of the substrate in a direction from the substrate to the anti-wear protective layer, and the Vickers hardnesses within the multi-layer bonding layer are in the range of from 1800 HV to 3500 HV.

5 . The tool according to claim 1 , wherein within the multi-layer bonding layer the modulus of elasticity increases perpendicular to a surface of the substrate in a direction from the substrate to the anti-wear protective layer, and values for the modulus of elasticity within the multi-layer bonding layer are within a range of from 380 GPa to 550 GPa.

6 . The tool according to claim 1 , wherein the multi-layer bonding layer perpendicular to a surface of the substrate has a thickness in the range of from 0.01 μm to 1 μm, and/or the single-layer or multi-layer anti-wear protective layer has a thickness in the range of from 0.4 μm to 20 μm.

7 . The tool according to claim 1 , wherein a ratio of the thickness of the single-layer or multi-layer anti-wear protective layer to the thickness of the multi-layer bonding layer is at least 2.0.

8 . The tool according to claim 1 , wherein the layers of the multi-layer bonding layer comprise alternating layers of titanium aluminum nitride having different compositions, wherein layers of a ratio of Ti:Al of (30 to 36):(70 to 64) alternate with layers having a ratio of Ti:Al of (40 to 60):(60 to 40).

9 . The tool according to claim 1 , wherein the anti-wear protective coating is multi-layered and has at least 2, 4 or 10 layers arranged one over the other and at most 50, 100 or 300 layers arranged one over the other.

10 . The tool according to claim 1 , wherein at least one further hard material layer is provided between the substrate and the bonding layer, preferably of TiN or metallic Ti, and/or that at least one further hard material layer is provided on top of the anti-wear protective coating.

11 . A process for the production of a coated tool comprising the steps of coating a base body of hard metal, cermet, ceramic, steel or high-speed steel with a multi-layer coating having an overall thickness of 1 μm to 20 μm, by a PVD process, wherein the multi-layer coating comprises a bonding layer and an anti-wear protective layer deposited directly on top of the bonding layer, wherein the bonding layer is deposited by a reactive or non-reactive cathodic vacuum arc vapor deposition to have a multi-layer design, wherein two layers of the bonding layer being each arranged directly one over the other have different compositions, and wherein the multiple layers of the bonding layer are formed from carbides, nitrides, oxides, carbonitrides, oxicarbides, carboxinitrides of at least two different metals selected from Ti, V, Cr, Zr, Nb, Mo, Ru, Hf, Ta, W, Al, Si, Y, Li and B, and solid solutions thereof, and wherein the anti-wear protective layer is deposited by means of high-power impulse magnetron sputtering to have a single-layer or multi-layer design, wherein the one or more layers of the anti-wear protective layer are each formed from carbides, nitrides, oxides, carbonitrides, oxicarbides, carboxinitrides of at least two different metals selected from Ti, V, Cr, Zr, Nb, Mo, Ru, Hf, Ta, W, Al, Si, Y, Li and B, and solid solutions thereof.

12 . The process according to claim 11 , wherein the layers of the bonding layer are each formed from nitrides or carbonitrides of at least two different metals selected from Ti, Al, Si, and Cr.

13 . The process according to claim 12 , wherein the multi-layer bonding layer has at least 4 layers arranged one over the other.

14 . The process according to claim 11 , wherein deposition parameters for the deposition of the multi-layer bonding layer are varied such that within the multi-layer bonding layer the Vickers hardness increases perpendicular from a surface of the substrate in the direction from the substrate to the anti-wear protective layer, and the Vickers hardnesses within the multi-layer bonding layer are within the range of from 1800 HV to 3500 HV, wherein the deposition parameters to be varied during the deposition of the multi-layer bonding layer includes at least a bias potential.

15 . The tool according to claim 2 , wherein the layers of the bonding layer are each formed from AlCrN, AlCrSiN, TiAlN, TiAlSiN, and TiSiN.

16 . The tool according to claim 10 , wherein the at least one further hard material layer provided on top of the anti-wear protective coating is one or more decorative layers of TiN, TiCN, ZrN.

17 . The process according to claim 12 , wherein the layers of the bonding layer are each formed from AlCrN, AlCrSiN, TiAlN, TiAlSiN, and TiSiN.

Assignees

• Walter Ag

Inventors

• Schier Veit

Classifications

• C23C28/044 Primary

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

• C23C14/35

  by application of a magnetic field, e.g. magnetron sputtering {(C23C14/3457 takes precedence)} · CPC title

• C23C14/024

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

• C23C28/048

  with layers graded in composition or physical properties · CPC title

• C23C28/44

  characterized by a measurable physical property of the alternating layer or system, e.g. thickness, density, hardness · CPC title