(1. 南京航空航天大學(xué) 江蘇省精密與微細(xì)制造技術(shù)重點(diǎn)實驗室，南京 210016；
2. 南京航空航天大學(xué) 機(jī)電學(xué)院，南京 210016)
摘 要: 分別采用點(diǎn)電極電沉積和平行板電極噴射電沉積制備二維的鎳枝晶，研究外加電壓、電解質(zhì)濃度、溫度等對金屬鎳枝晶二維電沉積生長行為特性的影響，并從分形維數(shù)的角度對其進(jìn)行分析。結(jié)果表明，在點(diǎn)電極電沉積時，枝晶的分形維數(shù)隨外加電壓的變化而波動，隨NiSO4濃度和試驗溫度的升高而增大；氣泡的析出使上述試驗條件對枝晶生長特性的影響變得不明顯。在噴射電沉積時，增大NiSO4濃度使氣泡析出量減少，枝晶簇的分形維數(shù)隨之減小，說明在大電流密度下，氣泡對枝晶簇生長形貌的影響起主導(dǎo)作用；試驗溫度從55 ℃升高到60 ℃時分形維數(shù)先增加后減小。
關(guān)鍵字: 鎳；分形；噴射電沉積
（1. Jiangsu Key Laboratory of Precision and Micro-Manufacturing Technology,
Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
2. College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics,
Nanjing 210016, China）
Abstract:Two-dimensional dendrites of Ni were fabricated by electrodeposition with point electrode and jet-electrodeposition with a parallel plate electrode, respectively. The influences of voltage, concentration of electrolyte and experimental temperature on the growth property and fractal dimension of dendrite were investigated. The results show that the fractal dimension of dendrite increases with the increase of concentration of NiSO4 and experimental temperature, and fluctuates with the variety of applied voltage in electrodeposition with a point electrode. The occurrence of bubble reduces the effects of those test conditions mentioned above; when the concentration of NiSO4 in jet-electrodeposition increases, the fractal dimension of dendrite cluster decreases gradually, which shows that the bubble takes a leading role in dendrite growth at a high current. An increase of experimental temperature from 55 ℃ to 60 ℃ makes the fractal dimension first increase and then decrease.
Key words: Ni; fractal; jet-electrodeposition
