航天器环境工程Issue(2)：158-161,4.DOI:10.3969/j.issn.1673-1379.2014.02.009
真空出气对星用聚酰亚胺材料电导率的影响
Influence of vacuum outgassing on dielectric conductivity of polyimide
曹旭纬 1张振龙 2汪金龙 1孙建军 1郑汉生 1韩建伟2
作者信息
- 1. 中国科学院 空间科学与应用研究中心，北京 100190
- 2. 中国科学院大学，北京 100049
- 折叠
摘要
Abstract
The vacuum outgassing of nonmetallic materials used for satellite may have a significant impact on the dielectric properties of the materials, thus increase the ESD risk of a long-term service satellite at a later stage. In this paper, the commonly-used non-metallic material (polyimide) is selected as the research object. The influence of outgassing on the surface potential of the polyimide samples is studied through the accelerated ground simulation test by a 90Sr-90Y radiation source, and the dielectric conductivity is calculated by curve fitting. It is found that in a high temperature vacuum environment under the 5 pA/cm2 electron irradiation, the samples that have experienced longer time of degassing exhibit lower conductivity, about half of its original value at a total mass loss of 0.5%. The related physical mechanism is analyzed. The result may provide some guidance to the ESD protection design for long-lifetime satellites.关键词
内部充电/聚酰亚胺/真空出气/表面电位/介质电导率/试验研究Key words
internal charging/polyimide/vacuum outgassing/surface potential/dielectric conductivity/test study分类
航空航天引用本文复制引用
曹旭纬,张振龙,汪金龙,孙建军,郑汉生,韩建伟..真空出气对星用聚酰亚胺材料电导率的影响[J].航天器环境工程,2014,(2):158-161,4.
