Influence of nozzle-fluid velocity on morphology and wear resistance of jet flow electrodeposited Ni-doped SiC composites

Abstract

In this account, Ni-doped SiC composites were deposited through jet flow electrodeposition technique, in which nozzle-fluid velocity of the plating solution was simulated by ANSYS software. The influence of nozzle-fluid velocity on morphologies and wear-resistance properties of Ni-doped SiC composites were investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), triboindentry, and wear testing. The nozzle-fluid velocity was found to greatly affect the surface morphologies and microstructures of Ni-doped SiC composites. At nozzle-fluid velocity of 3 m/s, Ni-doped SiC composites with smooth and fine morphologies were detected in the micro-regions, with average nickel grains size estimated to 44.5 nm. The nanohardness of Ni-doped SiC composites reached maximum at 3 m/s with average nanohardness estimated to ∼33.8 GPa. In addition, Ni-doped SiC composites deposited at 3 m/s possessed low weight losses (∼34.2 mg) and outstanding wear resistances. On the other hand, only slight scratches occurred on their surfaces, demonstrating excellent wear resistances.

Simulation and Experimental Research on Nickel-based Coating Preparedby Jet Electrodeposition at Different Scanning Speeds

“…2 Reynolds number, it is laminar flow, and when it is greater than the critical Reynolds number, it is turbulent flow [24] , the Reynolds number is defined by Eq. 1: an ideal state without impurities such as bubbles and solid particles [25] ; (2) Mass transfer is the result of diffusion, diffusion is a constant at a given temperature, convection is determined by the flow field and the migration driven by the electric field, and the whole process satisfies the mass conservation equation and momentum conservation equation [26] . Based on the above analysis and reasonable assumptions, the In addition, the "secondary current distribution" model is used to explain the distribution law of electric field.…”