(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)
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(140 μs)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。
关键字: 等离子体电解氧化；单弧光；瞬态放电；温度场模拟
arc discharge in plasma electrolytic oxidation process
（1. Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China;
2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China）
Abstract: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.
Key words: plasma electrolytic oxidation; single spark; instantaneous discharge; temperature filed simulation
