在线阅读 --自然科学版 2018年3期《空气中聚酰亚胺沿面闪络特性》
空气中聚酰亚胺沿面闪络特性--[在线阅读]
周立栋1, 孙永卫1, 蒙志成1, 杨茂松1, 刘可欣2
1. 陆军工程大学 国防科技重点实验室, 河北 石家庄 050003;
2. 北京理工大学 光电学院, 北京 100081
起止页码: 211--216页
DOI: 10.13763/j.cnki.jhebnu.nse.2018.03.005
摘要
由于聚酰亚胺(PI)具有良好的绝缘性、可塑性,因此PI作为一种特殊的工程材料被广泛应用于航天、航空.对不同间距的PI材料进行沿面闪络实验,得到PI闪络平均电压.实验发现:电极间距一定时,随着闪络放电次数的增加,闪络电压呈现先升高后降低最后趋于稳定的规律;放电次数一定时,闪络电压随电极间距的增大而增大.分析实验结果得出:PI样品表面粗糙的改变以及表面化学变化是造成上述规律的主要原因;样品表面粗糙程度越小闪络电压越低,闪络过程中C-O键含量的增加提高样品的亲水性,降低PI样品的绝缘性.

Surface Flashover Characteristics of Polyimide in Air
ZHOU Lidong1, SUN Yongwei1, MENG Zhicheng1, YANG Maosong1, LIU Kexin2
1. Key Laboratory of National Defense Science and Technology, Army Engineering University, Hebei Shijiazhuang 050003, China;
2. School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China
Abstract:
Polyimide (PI) is widely used in aerospace and aviation as a special engineering material,because of its good insulation and plasticity.In order to better understand the flashover characteristics of PI under normal pressure,in this paper,the surface flashover experiments of PI materials with different spacings are carried out,and the average voltage and voltage waveform of PI are obtained.The results show that when the electrode spacing is fixed,the discharge voltage increases first and then decreases with the increase of flashover discharge time,and finally tends to be stable.When the discharge time is constant,the flashover voltage increases with the increase of the electrode spacing.The phenomenon was thought to be due to the change of the surface roughness of the PI sample and the change of the surface chemistry.The smaller the surface roughness is,the lower the flashover voltage is.During the flashover process,the increasing number of the C-O bond enhances the hydrophilicity of the sample and reduces the insulation of the PI sample.

收稿日期: 2017-10-27
基金项目: 国家自然科学基金(51577190)

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