2A12航空铝合金微弧氧化陶瓷层生长过程  

Formation Process of Ceramic Films Fabricated by Micro-Arc Oxidation on 2A12 Aluminum Alloy

作　　者：孙志华[1] 刘明[1] 国大鹏[1] 郭孟秋[1] 陆峰[1] 陶春虎[1] 

机构地区：[1]中国航空工业集团公司北京航空材料研究院,北京100095

出　　处：《稀有金属材料与工程》2010年第A01期64-68,共5页Rare Metal Materials and Engineering

摘　　要：研究2A12铝合金微弧氧化陶瓷层的生长规律,分析不同氧化时间陶瓷层的表面和截面形貌、成分和相组成。研究表明,陶瓷层总厚度接近于线性增长,向外生长速度比向基体内生长的速率稍大,而致密层占总膜层的比例先快速增加,其后略微下降。SEM结果显示,陶瓷层表面有大量呈火山口状的等离子放电痕迹,随氧化时间延长,厚度在整个表面上趋于相等,界面处氧化膜变得比较平坦。陶瓷层主要由α-Al2O3和γ-Al2O3相组成,随着氧化时间的延长,γ-Al2O3相在陶瓷层中的含量先增加后减小,而α-Al2O3相的含量随氧化时间的延长逐渐提高。The growth process of micro-arc oxidation films on 2A12 aluminum alloy were investigated. Their microstructure, morphologies, composition and phase constituents for different oxidation time were studied by scanning electron microscope （SEM） and X-ray diffraction （XRD）. It shows that the thickness of total film increases linearly and the growth speed towards outer space is faster than that towards the substrate. While the ratio of dense layer in the film increases firstly and then decreases. 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 of the surface become the same and the film/substrate interface becomes even with the MAO time. The results of XRD reveal that with increasing oxidation time the content of γ-Al2O3 in the ceramic coatings decreases, while the content of α-Al2O3 increases.

关 键 词：铝合金 微弧氧化 生长过程 

分 类 号：V252.2[一般工业技术—材料科学与工程]