论文部分内容阅读
金属材料的二次电子发射是空间微波部件发生微放电效应的重要机制,微放电效应是航天器有效载荷射频功率增大的限制因素。本实验通过在金属银表面构造大尺度聚苯乙烯(PS)微球阵列制备微米尺度的银膜陷阱结构,实现对二次电子发射的抑制。重点研究了PS微球自组装方法对自组装效果的影响及镀银方式对银膜陷阱结构形貌的影响,并对利用PS微球构造的银膜陷阱结构的二次电子发射性能进行研究。结果表明:蒸发沉积法中的单基片法可有效实现PS微球的自组装,电化学沉积法镀银可获得银膜陷阱结构,且该银膜陷阱结构的二次电子发射系数最大值从2.2降低至1.6。
The secondary electron emission of metallic materials is an important mechanism for the micro-discharge effect of space microwave components. The micro-discharge effect is the limiting factor for the increase of the radio frequency power of spacecraft payloads. In this experiment, microscopic silver trap structures were prepared by constructing large-scale polystyrene (PS) microspheres arrays on the surface of metallic silver, and the suppression of secondary electron emission was achieved. The effect of self-assembly method of PS microspheres on the self-assembly effect and the effect of silver-plating method on the structure of the silver film trap were studied emphatically. The secondary electron emission properties of the silver film trap structure constructed by PS microspheres were also studied. The results show that the single-substrate evaporation method can effectively achieve self-assembly of PS microspheres. The silver film trapping structure can be obtained by electrochemical deposition of silver, and the maximum secondary electron emission coefficient 2.2 down to 1.6.