【摘要】 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。更多还原

【Abstract】 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.更多还原