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Effect of Nb on MC (M:Ti,Nb,Cr) precipitation and tribological behavior of TiC/Ni-based coating fabricated via plasma transferred arc

Ex-situ TiC reinforced Ni-based coating was fabricated via plasma transferred arc. This study focused on the relationship between the microstructure, microhardness and tribological properties of TiC/Ni-based coating with different Nb content. Results showed that Nb inhibited the dendritic microstructure formed by remelted TiC in the molten pool. Furthermore, the precipitation of M23C6 was affected dramatically by Nb content. When Nb content was 5 wt%, XRD and SEM results showed that M23C6 was strongly precipitated compared with the coatings with Nb content of 0 wt% and 10 wt%. M23C6, (Nb, Ti)C particles and solid solution film played an important role in tribological behavior, mainly reflected in improving the microhardness, wear resistance of the coating and reducing friction coefficient. The dry sliding wear test results showed that the reaction layer can inhibit the crack propagation between TiC and matrix, which is mainly attributed to the role of the reaction layer as the medium. The findings of this study would offer a valuable reference for TiC/Ni-based coatings to refine microstructure, improve interface adhesion between TiC and Ni-matrix, and enhance tribological properties.