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无机材料学报

• 研究论文 • 上一篇    下一篇

微弧熔区的淬冷过程及其对氧化铝膜微观结构的影响

李华平1,2,3, 柴广跃3, 彭文达3, 阳英3, 高敏3, 郭宝平3, 牛憨笨3   

  1. 1. 中国科学院西安光学精密机械研究所, 西安 710068; 2. 中国科学院研究生院, 北京100049; 3. 深圳大学光电子学研究所, 深圳518060
  • 收稿日期:2007-01-20 修回日期:2007-03-29 出版日期:2008-01-20 网络出版日期:2008-01-20

Simulation of Quenching Process during Microarc Oxidation (MAO) and its Effect on the Microstructure of Al2O3 Coating

LI Hua-Ping 1,2,3, CHAI Guang-Yue 3, PENG Wen-Da 3, YANG Ying 3, GAO Min 3, GUO Bao-Ping 3, NIU Han-Ben3   

  1. 1. Xi’an Institute of Optics and Precession Mechanics, Chinese Academy of Sciences, Xi’an 710068, China; 2. Graduate University of the Chinese Academy of Sciences, Beijing 100049, China; 3. Institute of Optoelectronics, Shenzhen University, Shenzhen 518060, China
  • Received:2007-01-20 Revised:2007-03-29 Published:2008-01-20 Online:2008-01-20

PDF (PC)

1652

被引次数

26 | 4

摘要： 通过实验和模拟拟合, 对微弧氧化过程中Al2O3膜表面的对流散热系数作了估计, 实验过程中发现Al2O3/Al界面在微观上也是一个冷却界面, Al 基体在冷却过程中起“热量中转”的作用, 熔池在淬冷过程中的大部分热量经过了邻近区域的Al2O3膜或者铝基体. 通过热模拟得到的纵深各点温度-时间曲线来表征微熔区的淬冷过程. 通过对各节点的相对冷却速度比较, 阐述了淬冷过程对α-Al2O3分布和Al2O3膜表面形貌的影响, 压力因素在微观结构形成过程中所产生的影响作了粗略的分析.

关键词: 铝合金, 微弧氧化, 淬冷过程, 微观结构, 有限元

Abstract: The convection heat transfer coefficient on A12O3 coating during microarc oxidation process was estimated by experiment and
simulation. The Al2O3/Al interface was found to be a heat-transfer passage. During quenching, most heat of the micro-melting-pool was transferred through the Al substrate and the A12O3 coating nearby. The micro-melting-pool was modeled by the finite element method (FEM), and the process of quenching was characterized by the simulated temperature-time curves of the nodes along the depth, respectively. The effects of the quenching on the distribution of α-A12O3 and surface morphology of A12O3 coating were discussed by comparing the relative cooling rate at different positions. The influence of pressure on the microstructure of Al2O3 coating was also discussed briefly.

Key words: Al alloy, microarc oxidation, quenching, microstructure, FEM

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