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

doi:10.3724/SP.J.1077.2008.00114

Abstract

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 A1₂O₃coating 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

CLC Number:

TG174

LI Hua-Ping,CHAI Guang-Yue,PENG Wen-Da,YANG Ying,GAO Min,GUO Bao-Ping,NIU Han-Ben. Simulation of Quenching Process during Microarc Oxidation (MAO) and its Effect on the Microstructure of Al₂O₃ Coating[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2008.00114.

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

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