枝晶形态逐层引导控制技术  

Morphology control technology of dendrite with layer by layer guidance

作　　者：王桂峰[1] 田宗军[1] 刘志东[1] 沈理达[1] 黄因慧[1] 

机构地区：[1]南京航空航天大学机电学院,南京210016

出　　处：《中国有色金属学报》2011年第9期2223-2229,共7页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(50575104);江苏省自然科学基金资助项目(BK2009375);南京航空航天大学基本科研专项基金资助项目(NS2010135)

摘　　要：在采用摆动射流电沉积实现枝晶二维可控交织生长的基础上,利用扫描摆动射流电沉积,逐层引导枝晶在扫描方向上交织生长,在不同摆动次数和扫描步进步长时制备三维多孔的金属组织,并对其形态变化进行分析,同时建立枝晶逐层引导生长模型。结果表明:不同摆动次数和步进步长时,枝晶生长形态的变化验证了该枝晶逐层引导生长模型的正确性;摆动次数较小时,相邻枝晶难以对接、交织;摆动次数较大时,相邻枝晶水平交织处的分支较为粗大;随着步进步长的增大,多孔金属组织的孔隙逐渐增大。通过调节各种工艺参数和控制条件,可以方便地实现对多孔金属组织形态的控制。The two-dimensional fractal growth of dendrites was transferred into interlaced growth by swinging jet-electrodeposition.Subsequently,with layer by layer guidance in scanning and swinging jet-electrodeposition,the dendrites were guided to interlace with each other along the scanning direction,forming three-dimensional porous tissues.The porous tissues under different swinging numbers and step-sizes were analyzed and the controllable interlaced growth model of dendrites was established at the same time.The result shows that the morphological evolution of porous tissues proves the accuracy of this growth model.With a small swinging number,the neighbor dendrites are difficult to interlace with each other.When the swinging number is relatively large the massive branches come into being at the interlaced spots along the horizontal direction.As the step-size increases,the pores of porous tissues become larger in size.The morphology of porous tissues is well controlled by the regulation of process parameters and control conditions.

关 键 词：多孔金属 枝晶 分形 射流电沉积 

分 类 号：TQ253.12[化学工程—有机化工]