Coating with enhanced sliding properties
AssigneeOerlikon Surface Solutions AG, PfäFfikon
InventorsJurgen Ramm, Florian Seibert, Beno Widrig
Life of this patent
Estimating the term…
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 self lubricated 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.
Claims14
A sliding component having a sliding surface to be exposed to relative movement with respect to another component under dry or lubricated conditions, wherein the sliding surface of the sliding component is at least partially coated with a coating system comprising a nitride-containing running-in layer deposited as outermost layer, wherein,
- the outermost layer comprises molybdenum nitride and at least one element or a mixture of elements whose melting point is lower than the molybdenum melting point, or
- the outermost layer consists of molybdenum oxynitride having an element composition ModOeNf, with d+e+f=1, f >e, and d >e, where d, e and f are the concentrations in atomic percent of molybdenum, oxygen and nitrogen, respectively.
A sliding component having a sliding surface to be exposed to relative movement with respect to another component under dry or lubricated conditions, wherein the sliding surface of the sliding component is at least partially coated with a coating system comprising a nitride-containing running-in layer deposited as outermost layer, wherein the outermost layer exhibits a multilayer architecture consisting of
- a combination of molybdenum nitride and molybdenum oxide single layers, wherein the molybdenum oxide single layers have element composition according to the formula MovOw with v≥w, where v and w are the concentration in atomic percent of molybdenum and oxygen, respectively, and/or
- a combination of oxynitride single layers having different element compositions along the running-in layer thickness.
A sliding component having a sliding surface exposed to relative movement with respect to another component under dry or lubricated conditions, wherein the sliding surface of the sliding component is at least partially coated with a coating system comprising an outermost layer, wherein the outermost layer is a self-lubricated layer with a structured surface comprising a multitude of circular recesses with diameters of several micrometers or less, the recesses randomly distributed over the surface,
- wherein the self-lubricated layer consists of a molybdenum oxynitride layer or a layer having element composition MOh-ZLMPiNj with j+h+i≈1 and j >h >i, where ZLMP is one element or a mixture of elements whose melting point is lower than the molybdenum melting point, and j, h and i are the element concentration in atomic percentage of nitrogen, molybdenum and ZLMP.
Dependencies are inferred from the claim text.