郑汉生, 韩建伟, 张振龙. 高能电子辐照下聚合物介质深层放电实验研究[J]. 航天器环境工程, 2017, 34(3): 295-300 DOI: 10.12126/see.2017.03.012
引用本文: 郑汉生, 韩建伟, 张振龙. 高能电子辐照下聚合物介质深层放电实验研究[J]. 航天器环境工程, 2017, 34(3): 295-300 DOI: 10.12126/see.2017.03.012
ZHENG Hansheng, HAN Jianwei, ZHANG Zhenlong. Experimental study of deep dielectric discharging of polymer under energetic electron irradiation[J]. Spacecraft Environment Engineering, 2017, 34(3): 295-300. DOI: 10.12126/see.2017.03.012
Citation: ZHENG Hansheng, HAN Jianwei, ZHANG Zhenlong. Experimental study of deep dielectric discharging of polymer under energetic electron irradiation[J]. Spacecraft Environment Engineering, 2017, 34(3): 295-300. DOI: 10.12126/see.2017.03.012

高能电子辐照下聚合物介质深层放电实验研究

Experimental study of deep dielectric discharging of polymer under energetic electron irradiation

  • 摘要: 为揭示聚合物介质材料在连续能谱高能电子辐射下的深层放电规律特征,利用90Sr放射源对聚四氟乙烯(PTFE)材料进行了不同条件的辐照实验。对采集的大量放电数据进行统计分析发现,电子辐照累积时间、入射电子通量以及温度都会影响介质的放电风险以及放电脉冲特征。高能电子对样品持续数天的累积辐照会降低介质自发放电的阈值条件,辐照后期放电更加频繁,但放电强度会减弱。入射电子通量越低时,放电风险越小;通量越高时,放电频率越高,高强度放电事件的发生概率也越大。温度主要通过影响介质的电导率而影响其深层放电特性,温度下降时介质本征电导率降低,充电电位和放电风险增加;一旦发生放电,放电电流脉冲的平均幅度也更大。

     

    Abstract: To acquire spontaneous discharging data of the polymers in spacecraft under energetic electrons with continuous spectrum and investigate the discharging characteristics of the polymers, 90Sr β source is utilized to irradiate Polytetrafluoroethylene(PTFE) samples and the spontaneous discharging pulse data are recorded. By statistic analysis of the data, it is shown that the irradiation duration, the electron flux and the temperature all can affect the discharging risk and pulse characteristics. Continuous irradiation under energetic electrons may reduce the discharging threshold of the PTFE. After several days of irradiation, the discharging tends to be more frequent with a lower intensity. When the electron flux gets higher, the discharging interval gets shorter and "big" discharging events are more likely to happen. When the temperature goes down, the dielectrics become less conductive with higher charging potential and greater discharging risk. Once the discharging happens, the average magnitude of pulses gets larger than that under a higher temperature condition.

     

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