Wear and/or friction reduction by using molybdenum nitride based coatings

Patent metadata

Field	Value
Publication number	US-12473628-B2
Application number	US-202117503563-A
Country	US
Kind code	B2
Filing date	Oct 18, 2021
Priority date	May 26, 2015
Publication date	Nov 18, 2025
Grant date	Nov 18, 2025

Abstract

A component including a substrate surface coated with a coating including at least one MoN layer having a thickness not less than 40 nm. Between the substrate surface and the at least one MoN layer the component includes: i) a substrate surface hardened layer, which is a hardened, nitrogen-containing substrate surface layer that is the result of a nitriding treatment carried out at the substrate surface and has a thickness not less than 10 nm, preferably not less than 20 nm and not greater than 150 nm, and/or ii) a layer system composed of more than 2 MoN layers and more than 2 CrN layers, wherein the MoN and CrN layers forming the layer system are individual layers deposited alternatingly one on each other forming a multilayer MoN/CrN coating film.

First claim

The invention claimed is:

1 . A component comprising a substrate surface coated with a coating comprising at least one MoN layer having a thickness not less than 40 nm, and a layer system composed of more than 2 MoN layers and more than 2 CrN layers,
wherein the MON and the CrN layers forming the layer system are individual lavers deposited alternate one on each other forming a mutilayer MoN/CrN coating film, said layer system being disposed between the substrate surface and the at least one MoN layer, wherein between the substrate surface and the at least one MoN layer a substrate surface hardened layer is comprised, which is a hardened, nitrogen-containing substrate surface layer that is the result of a nitriding treatment carried out at the substrate surface and has a thickness not less than 10 nm, and wherein said at least one MoN layer consists of molybdenum nitride comprising a mixture of phases, the mixture comprising:
the hexagonal phase δ-MON and the cubic phase γ-Mo 2 N, or
the hexagonal phase δ-MON and the oversaturated cubic phase ζ-MON, or
the hexagonal phase δ-MON and the cubic phase γ-Mo 2 N and the oversaturated cubic phase ζ-MoN.

2 . The component according to a claim 1 , wherein the component is an automotive component or a precision component, the substrate surface of the component having a hardness equal or lower than 65 HRC.

3 . The component according to claim 1 , wherein the thickness of said hardened, nitrogen-containing substrate surface layer is not less than 20 nm and not greater than 150 nm.

4 . A method for producing a component according to claim 1 , wherein said at least one MoN layer or at least one of the individual MoN layers are deposited by means of a reactive PVD process.

5 . The method according to claim 4 wherein the reactive PVD process is a reactive Arc PVD process, wherein during deposition of the MoN layer or the MoN individual layer, at least one target of Mo is operated as cathode and in this manner evaporated by using Arc PVD techniques in an atmosphere comprising nitrogen as reactive gas.

Assignees

• Oerlikon Surface Solutions Ag Pfaeffikon
• Oerlikon Surface Solutions Ag Pfaffikon

Inventors

• Karner Johann
• Derflinger Volker
• Luichti Maximilian Erich

Classifications

• C23C14/542

  Controlling the film thickness or evaporation rate · CPC title

• C23C14/024

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

• F16J9/26

  characterised by the use of particular materials · CPC title

• Y10T428/24975

  No layer or component greater than 5 mils thick · CPC title

• C23C28/042

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