Study on the Tribological Characteristics of Solid Lubricants Embedded Tin-Bronze Bearings

摘要

The friction and wear characteristics of graphite, MoS2, and PTFE embed- ded tin-bronze bearings were studied using a pin-on-disc tester. The results indicated that solid lubricants decreased and stabilized the friction coefficient, and decreased the wear rate by two to three orders of magnitude. When the content of solid lubricants, PTFE mixed with graphite, was 20-40%, the performance of the solid lubricants embedded bearing (SLEB) was the best. Wear scar was analyzed by means of X-ray diffraction (XRD), Auger electron spectroscopy (AES), and scanning electron microscopy (SEM). The results show that the transfer films of solid lubricants reduce adhesion between the SLEBs and the mating material, and the wear mechanism of SLEBs changes to fatigue and adhesive wear. The main reason for fatigue wear is microcracks expanding at Pb points in SLEBs.