Patent ID: 6787100
Filing Date: 2004-09-07
Classification: B22F,F16C,F16D

Abstract:
A method of fabricating multiple layer powder metal copper-based bearings, comprising;laying down a first layer of copper-based powder metal alloy on a metal backing strip; without first substantially densifying the first layer, laying down at least a second layer of copper-based powder metal alloy on top of the first layer, with the at least second layer being of a different composition than that of the first layer; without substantially densifying the layers, subjecting the layers to a first sintering step; cooling the layers following the first sintering step and thereafter compaction rolling the layers against the metal backing strip to densify and bond the layers to the backing and one another; and following compaction rolling, subjecting the layers to a second sintering step; wherein the layers are selected to be essentially lead-free compositions.