In recent research,a novel method combined with pulse current (PC) deposition and the ultrasonic (U) field was used to fabricate pure nickel and nickel-ceria composite coatings,respectively.Morphology,crack propagation,and crystal texture were observed and analysed by using environment seanning electron microscopy (E-SEM) and transmission electron microscopy (TEM).Orthogonal experiment [L16 (45)] was designed to optimize the parameters of pulsed power and the appropriate amount of RE addition based on microhardness.Effect of RE addition and pulsed current on the mechanism of co-electrodeposition was also investigated and compared.Experimental results indicated that it produced the alloying coatings,exhibiting compact grain and amorphous state.Nano-sized RE would preferentially occupy and pad at the edge of cracked gaps and micropore to limit the growing location and space for coarse Ni grain.Furthermore,during annealing at 480 ℃ for 2 h,a solid-solution precipitated phase named NiCexO1-x (0＜x＜0.5) dispersed along the large crystal boundary,which would make RE diffused sufficiently to improve crack propagation resistance and promote densifieation efficiently.
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