Abstract: In this paper, the frictional wear mechanisms of plasma sprayed ceramic coatings(Metco136F, Metco80NS, Metco102, Metco105, Metco75F, Metco202NS, Al203(made in China) at 450℃ have been studied. It was found out that the frictional wear behaviors of ceramic coatings were similar to those of metals such as fatigue spalling, plastic deformation, adhesive tear. Under high temperature (450℃), the dry friction coefficients of ceramic coatings were much higher than lubricated friction coefficients of ceramic coatings, and the wear mechanisms and the frictional surface topography under dry friction condition were much different from those under lubricated condition. Adhesive tear happened easily under dry friction condition, however, it was rather difficult for adhesive friction took place when lubricated.

Key words: 等离子喷涂, 摩擦磨损, 陶瓷涂层