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US 6,787,100 B2Granted
Multiple layer powder metal bearings
AssigneeFederal-Mogul World Wide, Inc.
InventorJames R. Toth
Life of this patent
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Abstract
A method of fabricating multi-layer bronze bearings includes laying down a first layer of copper-based powder metal material of a first composition onto a steel backing strip. At least a second layer of copper-based powder metal material of a second composition different than that of the first is laid down on the first layer, without significantly densifying the first layer. The layers are then sintered, cooled, and roll compacted to bond them to one another and to the backing, after which the layers are further sintered.
Claims5
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.
4 more elements
Dependencies are inferred from the claim text.