Sliding element, in particular piston ring

Patent metadata

Field	Value
Publication number	US-10072756-B2
Application number	US-201415111272-A
Country	US
Kind code	B2
Filing date	Dec 8, 2014
Priority date	Jan 15, 2014
Publication date	Sep 11, 2018
Grant date	Sep 11, 2018

Abstract

The invention relates to a sliding element, in particular a piston ring, having a carbon-based coating and at least in sections, a surface roughness (R Δq ) according to DIN EN ISO 4287 of 0.05, preferably 0.08, to 0.11, preferably to 0.1 μm.

First claim

The invention claimed is:

1. A sliding element having at least one running surface provided with a carbon-based coating, and at least in sections a roughness RΔq of 0.05 to 0.1 when calculated according to DIN EN ISO 4287.

2. The sliding element according to claim 1 , wherein the roughness RΔq of 0.05 to 0.1 is formed at least in the region of a convexity of the sliding element.

3. The sliding element according to claim 1 , the roughness RΔq of 0.05 to 0.1 is formed in an axial direction over 10 to 90% of the running surface.

4. The sliding element according to claim 1 , wherein the carbon-based coating is of the type TaC.

5. The sliding element according to claim 1 , wherein the layer thickness of the coating is 0.5 to 30 μm.

6. The sliding element according to claim 1 , wherein the carbon-based coating has an amount of sp3-hybridized carbon atoms of at least 40 at %.

7. The sliding element according to claim 1 , wherein the carbon-based coating has an E-modulus of 180 to 260 GPa and/or a hardness of 1600 to 2800 HV 0.02.

8. The sliding element according to claim 1 , wherein the carbon-based coating comprises oxygen and/or hydrogen each in an amount of less than 0.5 at %.

9. The sliding element according to claim 1 , wherein the carbon-based coating has an sp3/sp2 ratio of 0.3 to 1.2.

10. The sliding element according to claim 1 , wherein a metal-containing adhesive layer including chromium and/or titanium is provided between the carbon-based coating and a substrate.

11. The sliding element according to claim 10 , wherein the adhesive layer has a thickness of 0.05 to 1.0 μm.

12. The sliding element according to claim 1 , wherein the proportion of carbon in the carbon-based coating is more than 99% over the entire layer thickness.

13. The sliding element according to claim 1 , wherein the sliding element is a piston ring made of cast iron or steel.

14. The sliding element according to claim 1 , wherein said sliding element comprises a piston ring.

15. The sliding element according to claim 1 , wherein said roughness RΔq is between 0.08 to 0.11.

16. The sliding element according to claim 1 , wherein said roughness RΔq is 0.05.

17. The sliding element according to claim 1 , wherein the roughness RΔq of 0.05 to 0.1 is formed in axial direction over 25 to 75% of the running surface.

18. The sliding element according to claim 1 , wherein the layer thickness of the coating is between 10 to 30 μm.

Assignees

• Fed Mogul Burscheid Gmbh

Inventors

• Kennedy Marcus
• Zinnabold Michael
• Esser Peter

Classifications

• C23C14/025

  Metallic sublayers · CPC title

• C23C16/26

  Deposition of carbon only · CPC title

• C23C28/347

  with layers adapted for cutting tools or wear applications · CPC title

• C23C28/343

  with at least one DLC or an amorphous carbon based layer, the layer being doped or not · CPC title

• C23C14/0635

  Carbides · CPC title