摘要
利用扫描电镜(SEM)、X射线衍射仪(XRD)、磨损试验、激光共聚焦显微镜等手段,分析了镁合金AZ91D微弧氧化陶瓷层表面、截面形貌及相组成,研究了微弧氧化试样和基体试样的磨损性能及三维形貌。结果表明,AZ91D镁合金经微弧氧化处理10 min后,陶瓷层与基体结合紧密,表面有微孔和裂纹存在且较为粗糙,陶瓷层最小厚度达62.9μm左右。陶瓷层主要由Mg2Si O4相和Mg O两相组成,膜层硬度为349.4 HV,摩擦因数达到0.119,其磨损破坏的形式主要为剥离和划伤,微弧氧化试样的耐磨性有所提高。
Ceramic coatings prepared on surfaces of AZ91 D alloy by micro-arc oxidation and their surface,cross-section morphology and phase compositions were analyzed by means of SEM and XRD. The wear resistance of ceramic coatings and substrate from alloy AZ91 D and their three-dimensional shapes with laser confocal scanning were measured,respectively. The results show that the coating has a compacted bonding with the matrix of AZ91 D alloy. Besides,there are microholes and microcracks on the rough surfaces of the coatings.The ceramic coating with minimum thickness of 62. 9 μm is obtained in-situ after being oxided for around 10 min. It is found by X-ray diffraction that the coatings are composed of the phases Mg2 Si O4and Mg O. The hardness and friction coefficient of surface of the specimens treated by MAO technique increase respectively to 349. 4 HV and 0. 119,the wear behaviors of on the surfaces of specimens with MAO coating are spalling and scratch. The wear resistance of the ceramic coatings is improved.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2015年第6期181-184,共4页
Transactions of Materials and Heat Treatment
关键词
AZ91D
微弧氧化
陶瓷膜层
摩擦
磨损形式
AZ91D alloy
micro-arc oxidation(MAO)
ceramic coating
friction
wear behavior
