不同厚度铝合金微弧氧化陶瓷层摩擦学性能研究  

Study on Tribological Behavior of Microarc Oxidation Ceramic Coating of Aluminum Alloy with Different Thickness

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]北京航空材料研究院,北京100095

出　　处：《材料工程》2010年第11期69-73,78,共6页Journal of Materials Engineering

摘　　要：采用球-盘磨损实验方法,研究了不同厚度2A12铝合金微弧氧化陶瓷层的摩擦学特性及其磨损性能,用SEM观察陶瓷层的表面形貌、截面显微组织以及磨损后的形貌,XRD研究陶瓷层的相组成。研究表明,随氧化时间延长,样品表面膜厚度趋于均匀,界面处氧化膜变得比较平坦。陶瓷层主要由-αAl2O3和-γAl2O3相组成,随氧化时间的延长、厚度增大,γ-Al2O3相在陶瓷层中的含量逐渐减少,而高温态、高硬度的-αAl2O3相的含量随氧化时间的延长逐渐提高,陶瓷层的平均硬度逐渐增大;未磨光、有疏松层的陶瓷层的磨损失重和磨损速率随微弧氧化时间的延长、厚度增大均增大,而磨光、去除疏松层的陶瓷层的磨损失重和磨损速率则均逐渐下降;磨痕的形状均为滑动方向上呈现片状鱼鳞、沟槽,为黏着磨损特征,磨痕未见裂纹。The tribological performance of the microarc coatings with different thickness was evaluated using pin-on-disk tribometer,and surface morphology,cross-section structure and abrasive morphology before and after the test were analyzed by scanning electron microscope（SEM）,and phase constituents were studied by X-ray diffraction（XRD）.The results show that the thickness on the cross section becomes same and the film/substrate interface even with MAO time.The results of XRD reveal that the content of γ-Al2O3 in the ceramic coatings decreases,while α-Al2O3 increases with oxidation time,and so the average hardness increases with the oxidation time.The abrasive wear mass loss and wear rate increase with the oxidation time for the unpolished MAO films,while that decrease for the polished MAO films.The abrasive trace shows scales,grooves and there are not any cracks observed.

关 键 词：铝合金 微弧氧化 摩擦学性能 

分 类 号：TQ174.75[化学工程—陶瓷工业]