摘要
利用闭合场磁控溅射镀膜技术在AZ80合金基材表面进行沉积得到一层Zr涂层,并进行微弧氧化得到MAO-ZrO2涂层。对其进行组织和划痕实验测试研究得到:ZrO2涂层具有光滑的表面并具有银白色金属光泽,在ZrO2涂层表面上形成了很多细小的胞状晶粒。试样截面上形成了具有均匀结构的ZrO2涂层,同时涂层中的Zr元素也形成了均匀分布状态,最终得到厚度约5μm的涂层。当火花放电过程结束后,试样表面形成了更大的火花亮点同时数量有明显增加。在ZrO2-AZ80试样中主要以四方ZrO2为主,还有部分强度较小的MgO与Mg组成的衍射峰,根据存在MgO的情况可以推断基材已被氧化。采用微弧氧化方法进行处理后可以使涂层硬度增加。在采用微弧氧化方式生成的MAO-ZrO2涂层中所有划痕轨迹内没有出现脱落的涂层,采用微弧氧化方法可以制备得到和基体形成更强结合能力的涂层。
The ZrO2 coatings were synthesized in two steps:first,Zr-coatings were deposited by unbalanced magnetron sputtering on substrate of AZ80 Mg-alloy;second,the Zr-coatings were micro-arc oxidized(MAO).The influence of the MAO technique on the microstructures and tribological properties of the surface modified AZ80 Mg-alloy,an advanced material for automobile fabrication,were characterized with X-ray diffraction,energy dispersive spectroscopy,scanning electron microscopy and conventional mechanical tools.The results show that micro-arc oxidation makes the difference.To be specific,the Zr-layer was completely oxidized;and the smooth compact ZrO2 coatings,5μm in thickness,comprised the dominance of cubic ZrO2 grains and randomly distributed MgO and Mg particles.The ZrO2 coatings with fairly strong interfacial adhesion significantly improved the hardness and wear-resistance of AZ80 Mg-alloy.
作者
邹利华
周晓燕
李梦奇
吴海江
郭文敏
Zou Lihua;Zhou Xiaoyan;Li Mengqi;Wu Haijiang;Guo Wenmin(School of Mechanical and Energy Engineering,Shaoyang University,Shaoyang 422000,China;Key Laboratory of Hunan Province for Efficient Power System and Intelligent Manufacturing,Shaoyang University,Shaoyang 422000,China;School of Information Engineering,Shaoyang University,Shaoyang 422000,China)
出处
《真空科学与技术学报》
EI
CAS
CSCD
北大核心
2019年第9期796-800,共5页
Chinese Journal of Vacuum Science and Technology
基金
湖南省教育厅优秀青年项目(18B421)
湖南省教育厅科研重点项目(18A384)
高效动力系统智能制造湖南省重点实验室开放研究基金项目“动力系统关键部位高性能防护涂层制备及服役失效机理研究”
