Element comprising at least one sliding surface having a coating for use in an internal combustion engine or a compressor

Patent metadata

Field	Value
Publication number	US-9777239-B2
Application number	US-201214123002-A
Country	US
Kind code	B2
Filing date	May 28, 2012
Priority date	May 27, 2011
Publication date	Oct 3, 2017
Grant date	Oct 3, 2017

Abstract

An element with at least one slide surface with a coating for use on an internal combustion engine may include a base of a metallic alloy and at least one inner surface provided with a hard ceramic coating generated by physical vapor deposition. The element may include a porosity with a rate lower than 2 percent by volume, a Vickers hardness ranging from 1500 to 3000HV, and a compressive inner tension lower than 500 MPa.

First claim

The invention claimed is:

1. An element provided with at least one slide surface with a coating for use on an internal combustion engine, the element comprising:
a base of steel or cast iron; and
at least one inner surface provided with a hard ceramic coating generated by physical vapor deposition,
wherein:
the element includes a porosity with a rate lower than 2% by volume, Vickers hardness ranging from 1500 to 3000 HV, and compressive inner tension lower than 500 MPa; and
the physical vapor disposition is achieved by high power impulse magnetron plasma (HIPIMS), and the base is polarized with negative potential.

2. The element according to claim 1 , wherein the ceramic coating comprises nitrides formed by at least one of chrome, titanium, niobium, molybdenum, or aluminum.

3. The element according to claim 1 , wherein the coating includes porosity at a rate lower than 0.5 percent by volume.

4. The element according to claim 1 , wherein the coating includes compressive inner tension lower than 200 MPa.

5. The element according to claim 1 , wherein the coating includes a thickness ranging from 5 to 100 μm.

6. The element according to claim 1 , wherein the base includes cast iron.

7. The element according to claim 1 , wherein the base includes steel.

8. The element according to claim 1 , wherein the base includes aluminum.

9. The element according to claim 1 , wherein the element includes at least one of a piston ring, a tappet, a valve, a lob, and a bearing.

10. A coating, comprising:
a base material having a least one ceramic slide surface disposed thereon, wherein the slide surface includes a porosity with a rate lower than 2 percent by volume, Vickers hardness ranging from 1500 to 3000 HV, and compressive inner tension lower than 500 MPA.

11. The coating according to claim 10 , wherein the slide surface comprises nitrides formed by at least one of chrome, titanium, niobium, molybdenum, or aluminum.

12. The coating according to claim 10 , wherein the slide surface has porosity having a rate lower than 0.5 percent by volume.

13. The coating according to claim 12 , wherein the slide surface has compressive inner tension lower than 200 MPa.

14. The coating according to claim 13 , wherein the slide surface comprises a thickness ranging from 5 to 100 μm.

15. The coating according to claim 10 , wherein at least one of the base is polarized with negative potential and includes at least one of cast iron, steel, and aluminum.

16. A method for manufacturing an element with at least one sliding surface, comprising:
providing a base of a metallic alloy; and
generating a ceramic coating disposed on the base via physical vapor deposition, wherein the physical vapor deposition is achieved by high power impulse magnetron plasma sputtering;
wherein the coating includes a porosity with a rate lower than 2 percent by volume, Vickers hardness ranging from 1500 to 3000 HV, and compressive inner tension lower than 500 MPa.

17. The method according to claim 16 , wherein the coating includes a porosity having a rate lower than 0.5 percent by volume.

18. The method according to claim 16 , wherein the coating includes compressive inner tension lower than 200 MPa.

19. The method according to claim 16 , wherein the coating has a thickness ranging from 5 to 100 μm.

Assignees

• Da Rocha Mordente Paulo Jose
• Banfield Robert R
• Sarabanda Jose V
• Mahle Metal Leve Sa
• Mahle Int Gmbh

Inventors

• Da Rocha Mordente Paulo Jose
• Banfield Robert R
• Sarabanda Jose V

Classifications

• F02B77/02

  Surface coverings of combustion-gas-swept parts (of pistons F02F3/10; of cylinders and cylinder heads F02F1/00) · CPC title

• C23C14/3485

  using pulsed power to the target · CPC title

• C10M103/06 Primary

  Metal compounds · CPC title

• C23C14/0641 Primary

  Nitrides (C23C14/0617 takes precedence) · CPC title

• C23C30/00

  Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process (C23C26/00, C23C28/00 take precedence) · CPC title