通道扩张影响下液相脉冲放电沉积涂层的数值模拟  

Simulation of electrical discharge coatings in liquid based on channel expanding

作　　者：肖波[1] 揭晓华[1] 李国亮[1] 肖厚群[1] 

机构地区：[1]广东工业大学材料与能源学院,广州510006

出　　处：《中国科技论文》2013年第2期175-180,共6页China Sciencepaper

基　　金：国家自然科学基金资助项目(51075075);高等学校博士学科点专项科研基金资助项目(20104420110006)

摘　　要：以液相脉冲放电在45钢沉积TiC陶瓷涂层的工艺为研究对象,在原有的热源模型基础上考虑了放电通道半径、热载荷随时间的扩张过程,建立了合理的热源模型,运用ANSYS有限元软件模拟了不同脉冲电流、脉冲宽度对工件放电反应区的影响,获得了液相脉冲放电参数影响反应区域的一般规律。研究表明:由于通道半径以及热流密度载荷随着时间变化的瞬时性扩张,径向和轴向反应区域每一点必然受到热载荷波浪式的影响;放电中心点温度最高,距离中心点的各位置温度均能在某一瞬间达到各自的峰值;峰值电流、脉冲宽度是影响反应区大小的重要工艺参数,其中峰值电流的影响要大于脉冲宽度。研究结果进一步验证了模拟的可行性。With the technology of electrical discharge coating （EDC） in liquid for preparing TiC ceramic coating on 45 steel as the research object, we created a reasonable thermal model based on a previous model taking into consideration the expanding process of discharge channel radius and the change of thermal load over time. Effects of different pulse currents and pulse widths on the discharge reaction area were simulated by the ANSYS finite element software. General variation tendency with discharge parame- ters of EDC in liquid was obtained. Results suggested that the radial and axial reaction area was affected by wavelike heat flux loads, due to the instantaneous expansion existing in channel radius and the change of heat flux load over discharge time. Center point of discharge has the highest temperature, and peak temperature of each location can be reached at a moment. Peak electrical current and pulse width are important technical parameters affecting the reaction zone size and the peak electrical current has more impacts. The EDC experiment has verified the feasibility of the simulation.

关 键 词：陶瓷涂层 电沉积 碳化钛 碳钢 温度分布 有限元法 数值分析 

分 类 号：TG174.453[金属学及工艺—金属表面处理]