等离子体电解氧化弧光放电的瞬态测定及温度场模拟  

Instantaneous measurement and temperature field simulation of arc discharge in plasma electrolytic oxidation process

作　　者：刘晓静[1,2] 李光[1] 段红平[1] 夏原[1] 

机构地区：[1]中国科学院力学研究所,北京100190 [2]中国科学院研究生院,北京100049

出　　处：《中国有色金属学报》2011年第7期1681-1687,共7页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金面上项目(10772179);国家自然科学基金重点项目(10832011);中国博士后科学基金资助项目(20090460536)

摘　　要：为描述等离子体电解氧化(PEO)过程中单个弧光放电通道内部及周围温度场分布,构建圆柱形放电通道模型。采用高速摄像机和概率统计方法,测定铝合金PEO膜层生长典型阶段弧光放电的弧斑密度及通道尺寸等特征参数;通过计算单个弧光的延迟寿命(140μs)以及能量,获得模型参数。采用Ansys软件模拟单个弧光放电通道内部及周围温度场分布,计算得出弧光通道中心温度超过2×104 K,从传热学角度解释了PEO陶瓷层中γ-Al2O3和α-Al2O3的生成过程以及陶瓷层微结构的形成原因。In order to describe the temperature field distribution around a single discharge channel exactly during plasma electrolytic oxidation（PEO） process,a cylinder-shaped discharge model was designed.In the typical stage of the PEO coating growth on aluminium alloy,by using the high-speed camera and statistical method,the characteristic parameters of discharges,such as the spatial density of arc spot and size of channel,were measured,the lifetime（140 μs） and energy of a single spark were also calculated.The parameters of the model were obtained.The Ansys software was adopted to simulate the temperature field around a single discharge channel.The center temperature of the discharge channel was over 2×104 K.The results can explain the formation of γ-Al2O3 and α-Al2O3 and microstructure in the ceramic coatings from the heat transfer theory.

关 键 词：等离子体电解氧化 单弧光 瞬态放电 温度场模拟 

分 类 号：TG178[金属学及工艺—金属表面处理]