Abstract
YSZ@Ni core–shell nanoparticles were used to prepare a composite coating on an Fe-based alloy by laser cladding. Samples were sintered layer-by-layer with a laser power P in the range of 800–2000W, scanning velocity V in the range of 240–600mm/min, and the laser beam diameter D=5mm. The microstructures, phase constituents, and microhardness of a monolayer coating were investigated and compared with those of a multilayer coating. The results showed that the existing forms of core-YSZ in the monolayer coating comprised of four types: flower-like YSZ aggregates, few nanoscale YSZ particles at the grain boundaries, proeutectic YSZ phases, and YSZ/FeCr2O4 eutectic structure. Moreover, the multilayer coating structure was more homogeneous than the monolayer one. Interestingly, the YSZ@Ni core–shell nanoparticles were separated into core-YSZ and shell-Ni layer with a stratification feature during the laser cladding process.
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