Coating with enhanced sliding properties

Patent metadata

Field	Value
Publication number	US-10041017-B2
Application number	US-201314384896-A
Country	US
Kind code	B2
Filing date	Mar 11, 2013
Priority date	Mar 12, 2012
Publication date	Aug 7, 2018
Grant date	Aug 7, 2018

Abstract

The present invention relates to coated sliding parts having coating systems which allow better sliding performance under dry and/or under lubricated conditions. The coating systems according to the present invention being characterized by having an outermost layer which—is a smooth oxide-containing layer in case of sliding applications under lubricated conditions, or—is a self-lubricated layer comprising molybdenum nitride, in case of sliding applications under dry or lubricated conditions, is a selflubricated layer with a structured surface comprising a multitude of essentially circular recesses with diameters of several micrometers or below, the recesses randomly distributed over the surface.

First claim

What is claimed is:

1. Sliding component ( 10 ) having a sliding surface to be exposed to relative movement with respect to another component under lubricated conditions, wherein the sliding surface of the sliding component ( 10 ) is at least partially coated with a coating system ( 1 ) comprising an outermost layer ( 7 ), characterized in that,
the outermost layer ( 7 ) is an oxide-containing layer having mechanical stability at high temperatures and at least mostly comprising a metal oxide, the layer ( 7 ) having an element composition defined by the formula Me 1-b-c X c O b with b>0 and at least twice as large as c and with c>0, where
Me is a metal different from Mo or a combination of metals other than Mo, Me having a concentration in atomic percent of 1−b−c, and
O is oxygen having a concentration in atomic percent of b, and
X is or contains nitrogen and/or carbon, having a concentration in atomic percent of c,
wherein the outermost layer ( 7 ) has a smooth or smoothed surface which exhibits essentially no protrusions but which exhibits recesses, and
wherein the outermost layer ( 7 ) comprises arc-PVD droplets.

2. Sliding component ( 10 ) according to claim 1 , characterized in that the surface of the outermost layer ( 7 ) comprises a multitude of essentially circular recesses with diameters of several micrometers or below, the recesses randomly distributed over the surface.

3. Sliding component ( 10 ) according to claim 1 , characterized in that the surface of the outermost layer ( 7 ) is a polished surface.

4. Sliding component ( 10 ) according to claim 1 , characterized in that, the coating system ( 1 ) comprises additionally:
at least one bonding strength layer ( 3 ) for improving coating adhesion, and
at least one metal nitride containing layer ( 5 ) and
at least one additional oxide-containing layer ( 6 ) arranged under the outermost layer ( 7 ), the additional oxide-containing layer ( 6 ) differing from the outermost layer ( 7 ).

5. The sliding component ( 10 ) according to claim 4 wherein the at least one metal nitride containing layer ( 5 ) is chromium nitride or a molybdenum nitride.

6. The sliding component ( 10 ) according to claim 1 , characterized in that, the coating system ( 1 ) comprises additionally:
at least one metal nitride containing layer ( 5 ) and
at least one additional oxide-containing layer ( 6 ) arranged under the outermost layer ( 7 ), the additional oxide-containing layer ( 6 ) differing from the outermost layer ( 7 ).

7. The sliding component ( 10 ) according to claim 6 wherein that at least one metal nitride containing layer ( 5 ) is chromium nitride or a molybdenum nitride.

8. The sliding component ( 10 ) according to claim 1 , wherein the sliding surface of the sliding component ( 10 ) is disposed in contact with a surface of the component and wherein the sliding component ( 10 ) and the component slide relative to each other.

9. The sliding component ( 10 ) according to claim 1 , wherein X is or contains carbon having a concentration in atomic percent of c.

Assignees

• Oerlikon Trading Ag
• Oerlikon Surface Solutions Ag Pfaeffikon

Inventors

• Ramm Jurgen
• Seibert Florian
• Widrig Beno

Classifications

• C23C14/0641

  Nitrides (C23C14/0617 takes precedence) · CPC title

• C10M103/06 Primary

  Metal compounds · CPC title

• C23C14/0073

  by exposing the substrates to reactive gases intermittently · CPC title

• C23C14/325

  Electric arc evaporation · CPC title

• C23C14/0676 Primary

  Oxynitrides · CPC title