Polytetrafluoroethylene (PTFE) particles were irradiated with Co-60 gamma-ray to improve their dispersing capacity in polyurethane (PU), which was used as a binder of a PTFE-based bonded solid lubricating coating. The PU/PTFE-bonded solid lubricating coating was prepared on a steel block by spraying and curing at room ambient, and the tribological properties of the PU/PTFE coatings were evaluated on a ring-on-block tester at a speed of 1.25-2.5 m/s and a load of 314-785 N. The wear life of bonded coatings on PTFE volume concentrations, curing humidities and times, coating thickness, and sliding conditions was also investigated. It was found that a 60-mum thickness coating, which has a 40% PTFE volume concentration, cured at 75% relative humidity for 4 days, has a longer wear life of 844 m/mum at 314 N and 1.25 m/s. The PTFE/PU coating was wear-resistant when the load X speed value was less than 687 Nm/s(-1); at same time, the wear life for a thinner coating is sensitive to sliding condition variations.