Abstract:The Sn-Ag-Cu high temperature selflubricating rollers were prepared by vacuum infiltration technology,and the high temperature tribological characteristics of selflubricating roller bearings were studied on a new type of high temperature plane thrust bearing which used a set of ball isolation bodies as a retainer.The morphology of the friction surface of the raceway and the wear scar composition were analyzed by SEM/EDS.The results show that the friction coefficient of bearing is decreased gradually with the increasing of temperature from 400 ℃ to 600 ℃,the friction coefficient reaches the lowest value of 0.024 when the temperature reaches lubricant alloy melting point of 600 ℃.When the temperature is 400 ℃,the main wear mechanism of bearing raceway friction surface is adhesion wear.As the temperature increases,the lubricant alloy in the selflubricating material gradually precipitates and coats on the raceway surface,which affects the tribological characteristics of the bearing together with the high temperature oxides on the raceway surface,therefore,some adhesive wear and oxidation wear occur on the friction surface.When the temperature is 600 ℃,the lubrication film formed on the surface of raceway is increased,therefore the oxidation wear and adhesion wear are alleviated,and the best lubrication effect is realized.