放电镀膜时等离子体通道内粒子状态的计算机模拟  

Computer Simulation of Charge Particle State in Plasma Discharge Channel with Electrical Discharge Coating

作　　者：肖波[1] 揭晓华[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：《表面技术》2013年第6期6-9,22,共5页Surface Technology

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：目的分析液相脉冲放电微观机理,解释放电过程中放电通道对电极的影响。方法以45钢表面液相脉冲放电沉积TiC陶瓷涂层放电沉积瞬间极板间形成的单脉冲等离子体为研究对象,用粒子模拟的方法描述了放电通道中电子、钛离子的运动及分布状态。结果放电通道中电子的运动较为活跃,在放电形成的开始阶段,电子由工件电极负极激发,迅速向工具电极移动,期间通过与液相介质中的中性粒子碰撞,迅速往工具电极积累,运动过程中遵循等离子体的集体运动特性,过程贯穿于整个等离子体的形成过程;在相同的时间步长内,放电通道中Ti离子的运动比电子要缓慢得多,在脉冲放电期间需要较多的时间才能迁移到极板。结论放电镀膜时,所用极间距应大于电火花成形加工时的极间距。Objective To explore the mechanism of EDC, and the influence between discharge channel and elec- trode during discharge process. Methods The research object of this paper is single pulse plasma discharge channel, which formed in liquid when manufacture TiC ceramic coating on 45 steel by electrical discharge coating technology. The particle-in-cell simulation method is utilized to describe the movement and distribution of titanium ions and elec- trons. Results Electronic movement was active in discharge channel, the electrons were aroused in negative electrode and rapidly move to the tool electrode, and the complicated interaction with other particles led to electrons quickly ac- cumulate in tool electrode. Above-mentioned movement followed the collective motion features of plasma during the whole plasma formation process. At the same time step, the motion of titanium ion was much slower than electronic in plasma channel, and it took more time to move to the plate during the pulse discharge period. Conclusion It requires wider electrode distance when the electrical discharge coating is adopted compared with sinker EDM.

关 键 词：液相脉冲放电 粒子模拟 放电通道 等离子体 

分 类 号：TG174.453[金属学及工艺—金属表面处理] TP391.9[金属学及工艺—金属学]