Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Post sintering operation
Patent
1997-12-12
2000-03-28
Jenkins, Daniel J.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Post sintering operation
419 2, 419 6, 419 28, B22F 310, B22F 326, B22F 704
Patent
active
060427787
ABSTRACT:
A sliding bearing which is multilayered, self-lubricating and maintenance-free includes a metallic supporting body; and a layer of sintered bronze which is provided on the metallic supporting body and which has pores filled with polytetrafluoroethylene (PTFE) to provide a PTFE-impregnated sintered bronze layer, the PTFE being uniformly distributed and serving as a solid lubricant, and the PTFE-impregnated sintered bronze layer having a sliding surface composed of the PTFE particles but no PTFE cover layer. The sliding bearing is made by a method including applying a layer of bronze powder onto the metallic supporting body, the bronze powder having different particle sizes, having a mean particle size of about 40 .mu.m, and having a particle shape which is dendritic; sintering the layer of bronze powder in a furnace at a temperature of about 800.degree. C. to provide a sintered assembly; hot rolling the sintered assembly to provide the bronze layer with a porosity ranging from 40 to 70% throughout the entire thickness of the bronze layer; placing the sintered assembly in a container under a vacuum; supplying a suspension comprised of PTFE particles to the container for an infiltration period effective to secure infiltration of the PTFE particles into the pores of the sintered layer of bronze and provide a PTFE-impregnated bronze layer having a PTFE content of up to 20 weight %; and densifying the PTFE-impregnated bronze layer by means of rolling.
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Kraft Erik
Piesch Thomas
Roos Udo
Schwarze Hubert
Federal-Mogul Deva GmbH
Jenkins Daniel J.
Kelemen Gabor J.
Wells Ashley J.
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