Nano-CeO₂/Ni Composites Prepared by Pulse Electroforming

Ni/nano-CeO2 composites were prepared by pulse electroforming.Effects of concentration of nano-CeO2 particles in the electrolyte,pulse average current density,duty cycle and pulse frequency on the content of CeO2 in the Ni/nano-CeO2 composites were evaluated.The surface morphology and microhardness of composites were also analyzed.The results indicated that under the conditions of CeO2 concentration of 40 g·L-1 in the electrolyte ,pulse average current density of 4 A·dm-2,duty cycle of 0.2 and pulse frequency of 1 000 Hz,the composites containing 2.98% CeO2 particles had much higher microhardness (484 HV) than that of the pulse pure Ni(323 HV).The Ni/nano-CeO2 composites prepared by pulse electroforming had smoother morphology,more compact microstructure,further refined grains than that of the Ni/nano-CeO2 composites prepared by direct electroforming and improved agglomeration of CeO2 particles.