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X波段高功率微波对介质窗材料的破坏现象
引用本文:郝西伟,秋实,侯青,黄文华,张冠军.X波段高功率微波对介质窗材料的破坏现象[J].强激光与粒子束,2009,21(1).
作者姓名:郝西伟  秋实  侯青  黄文华  张冠军
作者单位:1. 西安交通大学 电力设备电气绝缘国家重点实验室, 西安 710049;2. 西安电子科技大学 电子工程学院, 西安 710071;3. 西北核技术研究所, 西安 710024
基金项目:国家高技术研究发展计划(863计划) 
摘    要: 在X波段微波源(频率9.4 GHz,功率1 GW)下,对4种典型介质窗材料(聚四氟乙烯、有机玻璃、低密度聚乙烯及高密度聚乙烯)在真空中进行了微波放电击穿实验,同时考虑了材料的不同表面处理工艺(表面刻槽和抛光)对其击穿特性的影响,对微波击穿后样品的表面形貌进行了宏观和微观分析,实验观测到:介质表面出现了沿微波电场方向的明显树枝状破坏现象,且材料表面处理工艺对其击穿破坏程度有显著影响,认为树枝状破坏通道与施加的微波场有着密切的关系。通过观察透明有机玻璃内部的树枝状破坏,发现树枝既沿介质表面生长,同时也向介质内部发展。提出了微波作用下介质窗击穿破坏的物理模型,认为微波电场导致树枝状破坏沿电场方向发展,而微波磁场导致树枝状向介质内部发展,并进一步给出了树枝状破坏起始和发展的可能原因。

关 键 词:高功率微波  介质窗  沿面击穿  微观形貌  树枝状破坏
收稿时间:1900-01-01;

Damage phenomena of dielectric window material under X-band high power microwave
Hao Xiwei,Qiu Shi,Hou Qing,Huang Wenhua,Zhang Guanjun.Damage phenomena of dielectric window material under X-band high power microwave[J].High Power Laser and Particle Beams,2009,21(1).
Authors:Hao Xiwei  Qiu Shi  Hou Qing  Huang Wenhua  Zhang Guanjun
Institution:1. State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, China;2. School of Electronic Engineering, Xidian University, Xi’an 710071, China;3. Northwest Institute of Nuclear Technology, Xi’an 710024, China
Abstract:The microwave discharge experiments of dielectric window were performed in vacuum under X-band HPM with the frequency of 9.4 GHz and the power of 1 GW. Several typical dielectric window materials, i.e., PTFE, PMMA, LDPE and HDPE, were employed, and the influence of different surface treatments as notching and polishing was investigated. After microwave breakdown experiments, the surface morphology of dielectric samples were analyzed with the macroscopic and microcosmic view. It was found that there were obvious single-surface tree-like breakage phenomena occurred along the direction of microwave electric field, and the surface destroy status was significantly affected by the different surface treatment. It is considered that the tree-like depredation channels are closely related to the app
Keywords:dielectric window  surface breakdown  micro-morphology  tree-like breakage
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