Lead-free aluminium sliding bearing material having a functional surface
AssigneeFederal-Mogul Wiesbaden GmbH
InventorsHOLGER SCHMITT, DANIEL MEISTER, MICHAEL WAGNER, GAETANO FABIO COSENTINO, RALPH HERBER, STEFANIE KATHARINA WEIDMANN
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Abstract
The invention relates to a sliding element having a coating, which comprises at least one functional layer, said functional layer having a mixed oxide-matrix and in the mixed-oxide matrix and solid lubricant particles and/or hard particles are embedded in the mixed oxide-matrix.
Claims15
A sliding element with 3 coating comprising at least one functional layer, characterised in that the functional layer comprises a mixed oxide matrix, and solid lubricant particles and/or hard particles are embedded in the mixed oxide matrix.
The sliding element according to one of the preceding claims, characterised in that
- the functional layer is applied onto the aluminium alloy layer which is in turn bonded to a substrate backing, and the substrate backing consists of steel, preferably one of the steel grades C06-C45.
The sliding element according to one of the preceding claims, characterised in that
- the solid lubricant particles comprise BaSO4, h-BN, graphite, MoS2, PTFE, WS2, ZnS and/or SnS2.
The sliding element according to one of the preceding claims, characterised in that
- the hard particles comprise oxides, nitrides, phosphides, phosphates, fluorides, WC, TiC, TaC, CrC, B4C, CaC2 and/or Al4C3.
The sliding element according to one of the preceding claims, characterised in that
- organically modified particles, particles with sinter additives such as preferably N3HCO3, core-shell particles, nanocapsules which are preferably filled with solid lubricant, and/or particles embedded in a polymeric sol are embedded in the mixed oxide matrix.
The sliding element according to one of the preceding claims, characterised in that
- the coating has a hardness of 10 to 1500 HV0.1, preferably 10-500 HV0.1.
The sliding element according to one of the preceding claims, characterised in that
- the functional layer has a thickness of 10 nm to 100 μm.
The sliding element according to one of the preceding claims, characterised in that
- the embedded particles have an average diameter of 1 nm to 15 μm.
The sliding element according to one of the preceding claims, characterised in that
- the functional layer has a thermal conductivity of 5 to 100 W/m*k, preferably 20 to 40 W/m*k.
The sliding element according to one of the preceding ciaims, characterised in that
- the distribution of the solid lubricant particles and/or hard particles in the mixed oxide matrix has a gradient from the inside to the outside.
The sliding element according to one of the preceding claims, characterised in that
- the coating has on its outside a cover layer which is preferably applied electrolytically.
Dependencies are inferred from the claim text.