目的：将超声波、磁场引入到微电铸过程中,改善电沉积镍晶微构件的表面性能。方法改变电流密度、脉冲占空比、超声波功率、磁场强度的方向和强度,进行电沉积镍晶微铸件,分析这些工艺参数对微铸件表面形貌和显微硬度的影响。结果微铸件的显微硬度随磁场强度的增大而显著提高,随着阴极电流密度、超声波功率及脉冲占空比的增大呈现出先升高、后下降的规律,其中脉冲占空比对电铸层显微硬度的影响较弱。优选的工艺参数为：垂直磁场强度0.8 T,阴极电流密度2 A/ dm2,超声波功率240 W,脉冲占空比20%。结论引入超声波和磁场后可优化电沉积环境,细化电铸层晶粒尺寸,改善电铸层微观形貌,提高微铸件显微硬度。
Objective In order to improve the surface properties of electro-deposited nickel micro-electroforming parts, ultrason-ic and magnetic fields were introduced into the micro electroforming process. Methods Current intensity, pulse duty cycle, ultra-sonic power, direction and intensity of magnetic field strength were altered during the electro-deposition of nickel micro-electrofor-ming parts, and the effects of the above parameters on the performance of the surface morphology and microhardness of the micro-electroforming parts were analyzed. Results The micro-hardness of the micro-casting part increased significantly along with the in-crease of the magnetic field intensity, while first increased and then decreased along with the increasing current intensity, pulse du-ty cycle and ultrasonic power, among which the pulse duty cycle had weaker effect on the micro-hardness as compared to the other parameters. The optimized parameters were: vertical magnetic field intensity 0. 8 T, cathode current density 2 A/ dm2 , ultrasonic power 240 W, and pulse duty cycle 20% . Conclusion Electrodeposition environment could be optimized after introducing ultra-sound and magnetic fields so as to refine the grain size, improve the electroformed layer morphology and enhance the microhardness of the microcasting parts.
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