Hydraulic devices including coated surfaces
AssigneeMaxterial, Inc.
InventorsAtieh Haghdoost, Mehdi Kargar, Ersan Ilgar, Daniel Church
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Abstract
Hydraulic devices that include a moveable component configured to contact a functional fluid during movement of the hydraulic device are described. The hydraulic device can include a coating on a surface. The coating can include a metal or metal alloy such as, for example, a molybdenum or tungsten in combination with one or more other materials.
Claims20
A method comprising depositing a surface coating on an exterior surface of a piston member of a hydraulic device, wherein the surface coating comprises an alloy layer comprising (i) molybdenum and (ii) phosphorous, boron, nitrogen or carbon and (iii) at least one element selected from the group consisting of nickel, tungsten, and tin, wherein the at least one element selected from the group consisting of nickel, tungsten, and tin is present in the alloy layer at 65% by weight or more based on the weight of the alloy layer, wherein the surface coating comprises a surface roughness Ra of less than or equal to 1 micron, and wherein the alloy layer comprises uniform and non-uniform grain sizes with an average grain size less than 2 microns.
A method comprising depositing a surface coating on an exterior surface of a piston member of a hydraulic device, wherein the surface coating comprises an alloy layer comprising (i) molybdenum and (ii) at least one element selected from the group consisting of nickel, tungsten, cobalt, tin, phosphorous, iron and boron, wherein the molybdenum is present in the surface coating at 85% or more by weight based on a weight of the surface coating.
Dependencies are inferred from the claim text.