颗粒增强金属基纳米复合材料脉冲电沉积制备研究

采用脉冲电沉积，在普通碳钢表面制备了Ni-W-P／CeO2-SiO2颗粒增强金属基纳米复合材料，研究了脉冲峰值电流密度和脉冲占空比对电沉积过程的影响，采用纳米颗粒的质量百分含量、沉积速率、显微硬度和表面形貌进行表征。结果表明：增加脉冲峰值电流密度或脉冲占空比，Ni—W—P基质金属晶粒细化，CeO2和SiO2纳米颗粒的质量百分含量提高。当脉冲频率为1000Hz，脉冲峰值电流密度和脉冲占空比分别为40A／dm^2和50％时，沉积速率最快（56．24μm／h），显微硬度最高（712Hv）。此时，Ni—W—P基质金属轮廓清晰，晶粒细小而均匀，CeO2和SiO2纳米颗粒以弥散态均匀分散在基质金属中。

Study on Particle-Reinforced Metal Matrix Nano-Composites Prepared by Pulse Electrodeposition

Ni-W-P/CeO2-SiO2 particle-reinforced metal matrix nano-composites were prepared on the carbon steel surface by pulse elecgtrodeposition of Ni,W,P,nano-CeO2 and nano-SiO2 particles,the effects of pulse peak current density and pulse duty cycle on the elecgtrodeposition were researched,the characteristics were assessed by nano-particle mass fraction,deposition rare,microhardness and surface morphology.The results show that increasing pulse peak current density or pulse duty cycle led to the grain size decreas...