脉冲电铸制备纳米CeO2增强镍基复合材料

Nano-CeO_2/Ni Composites Prepared by Pulse Electroforming

用脉冲电铸技术制备了纳米CeO2增强镍基复合材料,研究了镀液中纳米CeO2颗粒添加量、阴极平均电流密度、占空比及脉冲频率对电铸复合材料中CeO2含量的影响,并对复合材料的显微硬度和表面形貌进行了分析。结果表明:在CeO2添加量40 g.L-1、阴极平均电流密度4A.dm-2、占空比0.2、脉冲频率1 000 Hz的条件下,电铸复合材料中CeO2含量最高为2.98%;其显微硬度为484 HV,较脉冲纯镍的323 HV有明显提高;与直流电铸纳米CeO2增强复合材料相比,脉冲电铸制备的复合材料表面更平整,组织更致密,晶粒更细小,且减少了纳米CeO2颗粒的团聚现象。

Ni/nano-CeO2 composites were prepared by pulse electroforming. Effects of concentration of nanoCeO2 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 mierohardness （484 HV） than that of the pulse pure Ni（323 HV）. The Ni/nano-CeO2 composites prepared by pulse eleetroforming had smoother morphology, more compact microstructure, further refined grains than that of the Ni/nano-CeO2composites prepared by direct electroforming and improved agglomeration of CeO2 particles.