Sliding bearing and method of making a sliding bearing material

摘要

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 DEG 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.