磁控溅射与电镀工艺制备镀银层的微动磨损性能对比

Comparison of fretting wear properties of silver plating coating prepared by magnetron sputtering and electroplating processes

采用电镀与中频-直流磁控溅射技术分别在钢基体表面制备银镀层,利用显微硬度计、微米划痕仪和疲劳试验机等对两种镀银样品的硬度、结合力及微动磨损等性能进行了表征,并利用扫描电镜、激光共聚焦显微镜等对微动磨损后样品的磨损形貌和磨损机理进行了分析。结果表明:磁控溅射工艺制备的镀银样品的显微硬度、表面粗糙度要优于电镀工艺制备的镀银样品;磁控溅射工艺制备的镀银样品的结合力比电镀样样品的结合力高1.5倍,有利于提高镀层的耐磨性;经过300 h的有效微动磨损实验,发现磁控溅射工艺制备的镀银层相比于电镀工艺制备的镀银层的磨损深度下降了33.3%,这与磁控溅射工艺制备的镀银层表面光整度好和粒子尺寸更细小有关。磁控溅射工艺制备的镀银样品的磨损机理是磨粒磨损,而电镀工艺制备的镀银层是粘着磨损。

Silver coatings were prepared on the surface of steel substrates using electroplating and intermediate frequency direct-current magnetron sputtering processes.The hardness,adhesion and fretting wear properties of the two silver plated samples were characterized by microhardness tester,micrometer scratch tester and fatigue testing machine.The wear morphology and wear mechanism of the samples after fretting wear were analyzed by scanning electron microscopy and laser confocal microscopy.The results show that the microhardness and surface roughness of the silver plated samples prepared by magnetron sputtering process are better than those prepared by electroplating process.The adhesion of the silver plated samples prepared by magnetron sputtering process is 1.5 times higher than that of the electroplating samples,which is beneficial for improving the wear resistance of the coating.After 300 h of effective fretting wear,it is found that the wear depth of the silver coating prepared by magnetron sputtering process decreases by 33.3%compared to the silver coating prepared by electroplating process,which is related to the good surface smoothness and smaller particle size of the silver coating prepared by magnetron sputtering process.The wear mechanism of the silver plated samples prepared by magnetron sputtering process is abrasive wear,while the silver plated samples prepared by electroplating process is adhesive wear.