Abstract:To improve the surface microstructure and wear resistance of plasma sprayed coatings,different kinds of rare earth coatings were prepared by plasma spraying with the same mass fraction of CeO2 and Y2O3 as additives.Scanning electron microscopy(SEM)and X-ray diffraction(XRD)with energy dispersive spectroscopy(EDS)were used to analyze the surface morphology and microstructure of the rare earth coatings,and friction and wear tester was used to analyze the antiwear of the coatings.The results show that when the rare earth is added,especially when CeO2 and Y2O3 are added at the same time,the material accumulation and pore of plasma sprayed coatings disappear,the residual stress in the coatings is decreased by 38%,and the properties of friction reducing and antiwear of the coatings are obviously improved.After adding CeO2 or Y2O3 respectively,the wear of the coatings is changed from serious adhesive wear to adhesive wear and abrasive wear,while after adding CeO2 and Y2O3 at the same time,only abrasive wear occurs on the coatings.