航空材料学报2009，Vol.29Issue(6)：59-65,7.DOI:10.3969/j.issn.1005-5053.2009.6.012
工艺参数对2A12铝合金微弧氧化陶瓷层生长的影响
Effect of Technological Parameters on Formation Process of Ceramic Films Fabricated by Micro-arc Oxidation
孙志华 1国大鹏 1刘明 1郭孟秋 1陆峰 1陶春虎1
作者信息
摘要
Abstract
Effect of technological parameters, such as anodic current density(Ia)/ cathodic current density (Ic), frequency, cathodic duty ratio, on the formation process of micro-arc oxidation films on 2A12 aluminum alloy are studied and the microstructure, morphologies, composition and phase constituents under different oxidation time were studied by scanning electron microscope (SEM) and X-ray diffraction (XRD). The results show that film thickness increases with the current density and the increasing of Ic is beneficial to the film growth. With frequency and cathodic duty ratio, the film thickness increases firstly then decreases. The thickness of total film increases linearly and the growth speed towards outer space is faster than that towards substrate with the oxidation time. The results of SEM show that many crater-mouth like traces formed by the plasma discharge are observed on the coatings surface, and the thickness on the cross section become same and the film/substrate interface even with MAO time. The results of XRD reveal that the content of γ-Al_2O_3 in the ceramic coatings decreases, and the content of α-Al_2O_3 increases with oxidation time.关键词
铝合金/微弧氧化/生长过程Key words
aluminum alloy/ MAO/ formation process分类
矿业与冶金引用本文复制引用
孙志华,国大鹏,刘明,郭孟秋,陆峰,陶春虎..工艺参数对2A12铝合金微弧氧化陶瓷层生长的影响[J].航空材料学报,2009,29(6):59-65,7.
