Microstructure and Wear Resistance of Cr-Y Co-deposition Coating on Super 13Cr
Cr-Y co-deposition coating on super 13 Cr was prepared by pack cementation processes at 950 ℃ for 5 h.Surface morphologies, microstructure and phase constitutions of the coating were analysed by SEM, EDS and XRD.Friction-wear tests of the super 13 Cr substrate and the coating were studied in air at normal temperature. The results show that the coating prepared by co-depositing Cr-Y has obvious deposition and diffusion distribution characteristics. The coating mainly consists of Cr23C6, Cr7C3 and CrFe7C0.45. Under the experimental condition, the wear mass loss of Cr-Y coating is only1/15 as much as that of super 13 Cr, and the wear resistance increases significantly. The wear mechanism of super 13 Cr is grinding abrasion and grain-abrasion. The wear mechanism of Cr+Y coating is transfer of GCr15 on its surface.