重复频率纳秒脉冲聚四氟乙烯薄膜击穿特性  

Breakdown characteristics of repetitive nanosecond-pulse in polytetrafluoroethylene films

作　　者：章程[1,2] 邵涛[1] 龙凯华[1,2] 王珏[1] 张东东[1] 严萍[1] 

机构地区：[1]中国科学院电工研究所,北京100190 [2]中国科学院研究生院,北京100039

出　　处：《强激光与粒子束》2010年第3期479-483,共5页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(50707032);中科院知识创新工程重要方向项目(KGCX2-YW-339)

摘　　要：实验研究了聚四氟乙烯薄膜在重复频率纳秒脉冲下的击穿特性，选用脉冲上升时间约15ns，脉宽30-40ns，重复频率1～1000Hz。测量并计算了击穿前后的电压电流波形、重复频率耐受时间和施加脉冲个数与击穿特性密切相关的参数。结果表明，重复频率纳秒脉冲下聚四氟乙烯薄膜击穿场强为MV／cm量级，重复频率耐受时间随施加场强和重复频率的增大而减小。薄膜本身性质及油浸时间使实验数据具有分散性，重复频率纳秒脉冲下聚四氟乙烯薄膜击穿应考虑重复频率条件下的热积累效应和材料缺陷。An experimental study on repetition nanosecond-pulse breakdown in polytetrafluoroethylene（PTFE） films is presented, the pulse rise-time and pulse-width are 15 ns and 30-40 ns respectively, and the pulse repetition frequency varies from 1 to 1 000 Hz. The parameters affecting breakdown characteristics such as voltage-current waveforms, repetitive pulse stress time and applied pulse number are measured and calculated. The experimental results show that the electric field of repetition nanosecondpulse breakdown is on the order of MV/cm, and the repetitive pulse stress time decreases with the increasing of the applied electric field and the pulse repetition frequency. The dispersion of the experimental data results from the intrinsic film properties and oil-filling time. In addition, the thermal effect and material defect should be considered for the repetitive nanosecond-pulse breakdown mechanism in PTFE films.

关 键 词：重复频率 纳秒脉冲 聚四氟乙烯薄膜 击穿特性 重复频率耐受时间 

分 类 号：TM89[电气工程—高电压与绝缘技术] TM215[一般工业技术—材料科学与工程]