CUTTING TOOLS WITH Al-Cr-B-N/Ti-Al-N MULTILAYER COATINGS

• US 20130052477A1
• Filed: 01/25/2011
• Published: 02/28/2013
• Est. Priority Date: 02/04/2010
• Status: Active Grant

• Current Assignee: Oerlikon Surface Solutions Ag, PfAffikon (OC Oerlikon Corporation AG)
• Original Assignee: Oerlikon Trading AG, Trubbach
• Inventors: Lechthaler, Markus, Tritremmel, Christian
• Granted Patent: US 8,926,722 B2
• Time in Patent Office: Days
• US Class Current: 428/623
• CPC Class Codes: C23C 14/0641 Nitrides C23C14/0617 takes precedence
• CPC Class Codes: C23C 14/0647 Boron nitride
• CPC Class Codes: C23C 28/04 only coatings of inorganic non-metallic material
• CPC Class Codes: C23C 30/005 on hard metal substrates
• CPC Class Codes: Y10T 428/12549 Adjacent to each other
• CPC Class Codes: Y10T 428/24975 No layer or component greater than 5 mils thick
• CPC Class Codes: Y10T 428/265 1 mil or less

Abstract

The present invention relates to a multilayer coating system deposited on at least a portion of a solid body surface and containing in the multilayer architecture Al—Cr—B—N individual layers deposited by means of a physical vapour deposition method characterized in that in at least a portion of the overall thickness of the multilayer coating system the Al—Cr—B—N individual layers are combined with Ti—Al—N individual layers, wherein the Al—Cr—B—N and Ti—Al—N individual layers are deposited alternately one on each other, and wherein the thickness of the Al—Cr—B—N individual layers is thicker than the thickness of the Ti—Al—N individual layers, and thereby the residual stress of the multilayer coating system is considerably lower in comparison to the residual stress of the corresponding analogical Al—Cr—B—N monolayer coating.

Claims

1. Multilayer coating system deposited on at least a portion of a solid body surface and containing in the multilayer architecture Al—

Cr—

B—

N individual layers deposited by means of a physical vapour deposition method characterized in that in at least a portion of the overall thickness of the multilayer coating system the Al—

Cr—

B—

N individual layers are combined with Ti—

Al—

N individual layers, wherein the Al—

Cr—

B—

N and Ti—

Al—

N individual layers are deposited alternately one on each other, and wherein the thickness of the Al—

Cr—

B—

N individual layers is thicker than the thickness of the Ti—

Al—

N individual layers, and thereby the residual stress of the multilayer coating system is considerably lower in comparison to the residual stress of the corresponding analogical Al—

Cr—

B—

N monolayer coating system and preferably the hardness of the multilayer coating system is larger or equal to the hardness of the corresponding analogical Al—

Cr—

B—

N monolayer coating.

2. Multilayer coating system according to claim 1 characterized in that the thickness ratio of the Al—

Cr—

B—

N individual layers related to the Ti—

Al—

N individual layers in the coating portion where the Al—

Cr—

B—

N and Ti—

Al—

N individual layers are deposited alternately one on each other is basically 2;

1.

3. Multilayer coating system according to claim 1 or 2 characterized in that the layer composition of the Al—

Cr—

B—

N layers contained in the coating portion where the Al—

Cr—

B—

N and Ti—

Al—

N individual layers are deposited alternately one on each other is Al_aCr_bB_cN_d with a+b+c=1, a=9/5·

y, 0.1≦

z 0.3 where a, b and c are the atomic fractions determined after element analysis taking only the elements Al, Cr and B into account for the element balance.

4. Multilayer coating system according to claims 1-3 characterized in that the coating portion where the Al—

Cr—

B—

N and Ti—

Al—

N individual layers are deposited alternately one on each other contains at least two Ti—

Al—

N and two Al—

Cr—

B—

N individual layers, more preferably at least three Ti—

Al—

N and three Al—

Cr—

B—

N individual layers.

5. Multilayer coating system according to claims 1-4 characterized in that the thickness of the Ti—

Al—

N and Al—

Cr—

B—

N individual layers in the coating portion where the Al—

Cr—

B—

N and Ti—

Al—

N individual layers are deposited alternately one on each other remains constant.

6. Multilayer coating system according to claims 1-5 characterized in that the element composition of the Al—

Cr—

B—

N individual layers in the coating portion where the Al—

Cr—

B—

N and Ti—

Al—

N individual layers are deposited alternately one on each other remains constant.

7. Multilayer coating system according to claims 1-6 characterized in that the Al—

Cr—

B—

N and Ti—

Al—

N individual layers in the coating portion where the Al—

Cr—

B—

N and Ti—

Al—

N individual layers are deposited alternately one on each other are nano-layers whose corresponding individual thicknesses are each one ≦

100 nm, preferably the bilayer period defined as the sum of the thicknesses corresponding to one Al—

Cr—

B—

N and one Ti—

Al—

N individual nano-layer is ≦

100 nm, preferably is the bilayer period between 75 and 15 nm.

8. Multilayer coating system according to claims 1-7 characterized in that an additional Ti—

Al—

N individual layer is deposited between the coating portion where the Al—

Cr—

B—

N and Ti—

Al—

N individual layers are deposited alternately one on each other and the substrate surface and whose values of thickness and elements concentration are equal or different to the corresponding values of the Ti—

Al—

N individual layers contained in the coating portion where the Al—

Cr—

B—

N and Ti—

Al—

N individual layers are deposited alternately one on each other.

9. Multilayer coating system according to claims 1-8 characterized in that an additional Al—

Cr—

B—

N individual layer is deposited between the coating portion where the Al—

Cr—

B—

N and Ti—

Al—

N individual layers are deposited alternately one on each other and the coating surface and whose values of thickness and elements concentration are equal or different to the corresponding values of the Al—

Cr—

B—

N individual layers contained in the coating portion where the Al—

Cr—

B—

N and Ti—

Al—

N individual layers are deposited alternately one on each other.

10. Multilayer coating system according to claims 8-9 characterized in that the additional Ti—

Al—

N individual layer is deposited directly on the substrate surface and/or the additional Al—

Cr—

B—

N individual layer is deposited as outermost layer.

11. Multilayer coating system according to claims 1-9 characterized in that an additional adhesion layer not consisting of Ti—

Al—

N is deposited directly on the substrate surface to improve the coating adhesion to substrate and/or an additional outermost layer not consisting of Al—

Cr—

B—

N is deposited on the coating surface as top layer, this layer can be for example a thin decorative layer or a running-in layer.

12. Multilayer coating system according to claims 1-11 characterized in that the overall coating thickness of the multilayer coating system is equal or thicker than 3 μ

m, preferably equal or thicker than 5 μ

m.

13. Multilayer coating system according to claims 1-12 characterized in that at least the coating portion where the Al—

Cr—

B—

N and Ti—

Al—

N individual layers are deposited alternately one on each other is synthetized by reactive cathodic arc evaporation. Due to the deposition using arc evaporation macro particle of metallic materials from target are present in the coating. These macro particle contribute to improve the overall coating endurance strength by adding elasticity and they don'"'"'t worsen the mechanical, thermal, chemical and tribological properties of the Al—

Cr—

B—

N/Ti—

Al—

N multilayer coatings.

14. Multilayer coating system according to claims 1-13 characterized in that at least the coating portion where the Al—

Cr—

B—

N and Ti—

Al—

N individual layers are deposited alternately one on each other exhibit a face-centered cubic structure in the as-deposited state.

15. Multilayer coating system according to claim 1-10 or 12-14 characterized in that the outermost layer is an Al—

Cr—

B—

N layer that exhibits the formation of BxNy.

16. Solid body at least partially coated with a multilayer coating system according to claims 1-15.

17. Solid body according to claim 16 characterized in that the solid body is a cutting tool or a forming tool or a stamping tool, or a component or a part of a vehicle, or a component or part to be used in the motor industry or aerospace industry, in the last case for example a turbine component.

18. Method for manufacturing a solid body according to claims 16-17.