单极性脉冲电流密度对铝合金MAO膜相结构和微结构的影响

单极性脉冲电流密度对铝合金MAO膜相结构和微结构的影响

王乃丹¹,龙北玉¹,吴汉华^1,2,毕冬梅¹,汪剑波²,李全军²

（1.吉林大学物理学院, 长春 130021; 2. 吉林大学超硬材料国家重点实验室, 长春 130012）

收稿日期:2005-03-28 修回日期:1900-01-01 出版日期:2005-09-26 发布日期:2005-09-26
通讯作者: 吴汉华

Effects of Unipolar Pulse Current Density on the Phase Composition and Microstructure of Aluminium Alloy MAO Coating

WANG Nai-dan¹，LONG Bei-yu¹，WU Han-hua^1,2,BI Dong-mei¹,WANG Jian-bo²,LI Quan-jun²

(1. College of Physics, Jilin University, Changchun 130021, China;2. State Key Laboratory for Superhard Materials, Jilin University, Changchun 130012, China)

Received:2005-03-28 Revised:1900-01-01 Online:2005-09-26 Published:2005-09-26
Contact: WU Han-hua

摘要/Abstract

摘要： 利用微弧氧化(MAO)技术在铝合金表面沉积陶瓷膜, 采用X射线衍射仪(XRD), 扫描电子显微镜(SEM), 电子能谱(EDS)和显微硬度方法, 研究了MAO过程中单极性脉冲电流密度与氧化膜力学性能和化学成分的关系. 发现在较高电流密度下制备的陶瓷膜中含有较多的α-Al₂O₃相, 而在较低电流密度下制备的陶瓷膜主要由γ-Al₂O₃相组成. 对陶瓷膜截面上不同厚度处的膜层化学成分分析表明, 组成氧化膜的主要物质α-Al₂O₃和γ-Al₂O₃的比例随深度的变化呈现出复杂的变化规律, 这一结果与相关的文献报道有所不同.

关键词: 铝合金, 微弧氧化, 显微硬度, 单极性脉冲, 陶瓷膜

Abstract: The ceramic coatings on the Al-alloy substrate have been synthesized by means of microarc oxidation (MAO) technique. Effects of the unipolar pulse current density on the mechanical and chemical properties of the coatings have been studied via XRD, SEM, EDS, and microhardness test. The samples fabricated at high current densities consist mainly of α-Al₂O₃ phase, while the samples fabricated at low current densities are almost completely composed of γ-Al₂O₃. The content analysis on the cross-section of the coating indicates that the ratio of α-Al₂O₃ content to γ-Al₂O₃ content shows complicated changes with the variation of the film depth, which is different from the results reported from other literatures.

Key words: aluminium alloy, microarc oxidation, microhardness, unipolar pulse, ceramic film

中图分类号:

TG174.453

王乃丹,龙北玉,吴汉华,毕冬梅,汪剑波,李全军. 单极性脉冲电流密度对铝合金MAO膜相结构和微结构的影响[J]. J4, 2005, 43(05): 645-649.

WANG Nai-dan，LONG Bei-yu，WU Han-hua,BI Dong-mei,WANG Jian-bo,LI Quan-jun. Effects of Unipolar Pulse Current Density on the Phase Composition and Microstructure of Aluminium Alloy MAO Coating[J]. J4, 2005, 43(05): 645-649.

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