Component having a coating and method for the production thereof

Patent metadata

Field	Value
Publication number	US-10059899-B2
Application number	US-201314437942-A
Country	US
Kind code	B2
Filing date	Oct 23, 2013
Priority date	Oct 23, 2012
Publication date	Aug 28, 2018
Grant date	Aug 28, 2018

Abstract

The invention relates to a component having a coating containing chromium, nitrogen and carbon, which component is characterized in that the coating comprises a sliding layer having a ceramic phase and an amorphous phase. According to the invention the ceramic phase forms a crystalline ceramic matrix from Crx(C 1-y N y ) with 0.8=x=1.2 and y>0.7, and the amorphous phase consists of carbon particles that are embedded in substantially uniform distribution in the crystalline ceramic matrix.

First claim

The invention claimed is:

1. Component having a coating containing chromium, nitrogen, and carbon, wherein the coating has a lubricating layer having a ceramic phase and an amorphous phase, that the ceramic phase forms a crystalline ceramic matrix composed of Cr x (C 1-y N y ) with 0.8≤x≤1.2 and y>0.7, and that the amorphous phase consists of carbon particles that are embedded into the crystalline ceramic matrix in substantially uniform distribution, wherein the lubricating layer has a total carbon content of 3-15 atom-%, and wherein the lubricating layer has an average roughness depth Rz of less than 1 μm and/or the material proportion Rmr(02) amounts to more than 50% and/or the material proportion Rmr(03) amounts to more than 80%,
wherein an adhesion layer consisting of molybdenum, chromium, titanium, tungsten or chromium-aluminum alloy is applied between the basic body and the lubricating layer, and
wherein an intermediate layer consisting of chromium nitride, molybdenum nitride, titanium nitride or chromium aluminum nitride is applied between the adhesion layer and the lubricating layer.

2. Component according to claim 1 , wherein the crystalline ceramic matrix composed of Cr x (C 1-y N y ) meets the conditions 0.9≤x≤1.1 and y>0.8.

3. Component according to claim 1 , wherein the carbon particles have a size of less than 10 nm.

4. Component according to claim 3 , wherein the carbon particles have a size of less than 5 nm.

5. Component according to claim 1 , wherein the lubricating layer has a total carbon content of 5-10 atom-%.

6. Component according to claim 1 , wherein the thickness of the lubricating layer amounts to 1-50 μm.

7. Component according to claim 1 , wherein the Vickers hardness of the lubricating layer amounts to 2000-3000 HV 0.05.

8. Component according to claim 1 , wherein the modulus of elasticity of the lubricating layer amounts to 200-300 GPa.

9. Component according to claim 1 , wherein the component has a basic body composed of cast iron or steel.

10. Component according to claim 1 , wherein the component is a piston ring for an internal combustion engine.

Assignees

• Mahle Int Gmbh

Inventors

• Lehnert Monika
• Maier Kurt

Classifications

• C23C14/32

  by explosion; by evaporation and subsequent ionisation of the vapours {, e.g. ion-plating}(C23C14/34 - C23C14/48 take precedence) · CPC title

• C10M125/20

  Compounds containing nitrogen · CPC title

• C23C14/06 Primary

  characterised by the coating material ({C23C14/0021} , C23C14/04 take precedence) · CPC title

• C23C28/324

  with at least one metal matrix material layer comprising a mixture of at least two metals or metal phases or a metal-matrix material with hard embedded particles, e.g. WC-Me · CPC title

• C23C14/325

  Electric arc evaporation · CPC title