(南京航空航天大學(xué) 機(jī)電學(xué)院，南京 210016)
摘 要: 在采用擺動(dòng)射流電沉積實(shí)現(xiàn)枝晶二維可控交織生長的基礎(chǔ)上，利用掃描擺動(dòng)射流電沉積，逐層引導(dǎo)枝晶在掃描方向上交織生長，在不同擺動(dòng)次數(shù)和掃描步進(jìn)步長時(shí)制備三維多孔的金屬組織，并對其形態(tài)變化進(jìn)行分析，同時(shí)建立枝晶逐層引導(dǎo)生長模型。結(jié)果表明：不同擺動(dòng)次數(shù)和步進(jìn)步長時(shí)，枝晶生長形態(tài)的變化驗(yàn)證了該枝晶逐層引導(dǎo)生長模型的正確性；擺動(dòng)次數(shù)較小時(shí)，相鄰枝晶難以對接、交織；擺動(dòng)次數(shù)較大時(shí)，相鄰枝晶水平交織處的分支較為粗大；隨著步進(jìn)步長的增大，多孔金屬組織的孔隙逐漸增大。通過調(diào)節(jié)各種工藝參數(shù)和控制條件，可以方便地實(shí)現(xiàn)對多孔金屬組織形態(tài)的控制。
關(guān)鍵字: 多孔金屬；枝晶；分形；射流電沉積
layer by layer guidance
（College of Mechanical and Electrical Engineering,
Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China）
Abstract: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.
Key words: porous metal; fractal; dendrite; jet-electrodeposition
