改性聚酰亚胺的真空直流沿面闪络特性

张振军 1; 苗军 2; 王学强 2; 吴文斌 1; 南江 1; 郑晓泉 1

doi:10.7652/xjtuxb201304010

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改性聚酰亚胺的真空直流沿面闪络特性

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- 改性聚酰亚胺的真空直流沿面闪络特性
- Surface Flashover Characteristics of Modified Polyimide Under DC Voltage in Vacuum
- 西安交通大学学报 2013年47卷第4期页码：51-56
- 作者机构：
  
  西安交通大学电力设备电气绝缘国家重点实验室,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201304010
  中图分类号： TM855;TM215.1
- 网络首发：2013-04-10，
  
  纸质出版：2013
- 稿件说明：
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张振军 1, 苗军 2, 王学强 2, 等. 改性聚酰亚胺的真空直流沿面闪络特性[J]. 西安交通大学学报, 2013,47(4):51-56.

Surface Flashover Characteristics of Modified Polyimide Under DC Voltage in Vacuum[J]. 2013, 47(4): 51-56.
张振军 1, 苗军 2, 王学强 2, 等. 改性聚酰亚胺的真空直流沿面闪络特性[J]. 西安交通大学学报, 2013,47(4):51-56. DOI： 10.7652/xjtuxb201304010.

Surface Flashover Characteristics of Modified Polyimide Under DC Voltage in Vacuum[J]. 2013, 47(4): 51-56. DOI： 10.7652/xjtuxb201304010.

摘要

研究改性技术对聚酰亚胺(PI)的真空直流沿面闪络特性的影响并分析其闪络机理。采用半导电微粉对PI进行改性

在10

-3

Pa以下实验研究改性前后PI材料的直流闪络特性。结合扫描电子显微镜观测到的闪络试样表面状态以及复合试样的二次电子发射系数测试结果

分析高真空背景下的直流闪络机理。实验结果表明:采用具有非线性电导特性的纳米改性剂对PI进行改性

可以显著提高材料的真空直流沿面闪络电压

采用微米改性剂时其闪络电压反而低于纯材料; 纳米改性在降低PI材料表面二次电子发射系数的同时也会增加表面粗糙度; 在闪络即将发生时

材料表面有气体逸出现象。结合用扫描电镜观测到的表面微孔现象以及物理分析

认为纳米改性后的复合试样具有更低的电子诱导脱附系数

由此而导致的气体解吸附是影响真空直流电压下沿面闪络的关键因素。

Abstract

Direct current(DC)surface flashover characteristics of modification technology on polyimide(PI)in vacuum are investigated accompanied with the theoretical analysis. Two kinds of semi-conductive powders(nano scale and micro scale)are chosen as the modifier of raw PI

and the experiments for DC surface flashover characteristics of PI material in vacuum(10

-3

Pa)are carried out. Meanwhile

the surface flashover mechanism under DC voltage in high vacuum is analyzed following the test results of secondary electron emission(SEE)coefficient and the observed surfaces state of flashover experimented samples by scanning electron microscopy(SEM). The experimental results show(1)In vacuum

DC surface flashover voltage of nano modified PI which used

nonlinear conductivity filler is higher than pure PI

while that of micro modified PI is lower than pure PI;(2)The surface SEE coefficient of nano modified is reduced and the roughness of surface is increased;(3)Gas overflow phenomenon appears in the moment of prebreakdown. In combination with the results of SEM and physical analysis

it is considered that the nano modified composite sample has a lower electron-stimulated desorption coefficient

thus leading to gas desorption

is the key factor affecting DC surface flashover voltage in vacuum.

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references

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