Material for low-maintenance sliding surface bearings

Claim 1

A material for low-maintenance sliding surface bearings, which material comprises a metallic backing and a bearing layer having a thickness of 30 to 500 μm and consisting of a mixture of polyvinylidene fluoride (PVDF) and at least one additive for improving the friction and sliding properties, wherein the mixture further contains 1 to 2% by weight of a non-toxic metal oxide powder consisting of one of chromic oxide and ferrix ocide having a particle size of about 0.05 μm, 10 to 40% by weight of solid glass spheres having a size of 1 to 50 μm and coated with a coupling agent comprising silane and 5 to 25% by weight polytetrafluoroethylene (PTFE) having a particle size of 6 μm and wherein the bearing layer is provided on a rough primer, on the backing and wherein the rough primer consists of one of a sintered and sprayed-on porous bronze layer having a thickness of 200 to 350 μm and the open pores of the bronze layer have a total volume of 24 to 45% and are completely filled by the mixture which consists of PVDF, metal oxide powder and glass spheres and which also constitute the bearing layer.