(1. 南京航空航天大学 江苏省精密与微细制造技术重点实验室，南京 210016；
2. 南京航空航天大学 机电学院，南京 210016)
摘 要: 利用分形几何的原理模拟点阳极电沉积中枝晶的分形生长，分别研究阳极大小、射流速度、NiSO4浓度和温度等试验条件对点阳极射流电沉积中金属镍枝晶二维电沉积生长行为特性的影响，并从分形维数的角度对其进行分析。结果表明：点阳极射流电沉积中的枝晶也呈分形生长，其分形维数随着点阳极尺寸的增大而增加；射流速度的提高使枝晶簇根部的生长点明显增多，但在射流速度较低时，枝晶簇顶部的形貌较为致密；大量气泡的析出有利于产生分枝，此时气泡对枝晶生长的形貌起主导作用，使射流速度变化时的分形维数出现波折；电解质浓度的增大使枝晶簇的分形维数逐渐减小；且随着试验温度的提高，分形维数也随之增加。
关键字: 镍；射流电沉积；分形生长；枝晶
（1. Jiangsu Key Laboratory of Precision and Micro-Manufacturing Technology,
Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
2. School of Mechanical and Electronic Engineering, Nanjing University of Aeronautics and Astronautics,
Nanjing 210016, China）
Abstract:The fractal growth process of dendrite in jet-electrodeposition with point anode was stimulated. The influences of anode size, jetting speed, NiSO4 concentration and experiment temperature on the growth property of dendrite growth and fractal dimension were investigated. The results show that the dendrite of metal Ni obtained in jet-electrodeposition with point anode is also fractal growth. The fractal dimension of dendrite increases with increasing anode size. With increasing jetting speed, the growing points at the bottom of dendrite increase significantly and the morphology at the top becomes denser when the jetting speed is low. At the same time, the bubble is helpful to produce branches and takes role in the dendrite growth at high current. So, the fractal dimension twists when the jetting speed changes. The increase of concentration of NiSO4 makes the fractal dimension gradually decrease. With increasing experiment temperature, fractal dimension dendrite increases.
Key words: Ni; jet-electrodeposition; fractal growth; dendrite
