CAJ | 학술논문

卫星介质材料在真空环境下的出气有可能对材料本身的介电性能产生显著影响，增加长期服役卫星寿命末期的充放电风险。文章以卫星上常用的聚酰亚胺材料为对象，通过地面90Sr-90Y辐照源加速辐照试验研究了在材料真空出气后其表面充电平衡负电位的变化，并据此计算出材料电导率的变化规律。结果显示，在5 pA/cm2电子辐照强度下，聚酰亚胺样品的电导率随着出气量的增加而明显下降，在总质量损失达到0.5%时，电导率减小一半左右。初步分析了出气导致电导率下降的物理机制。研究结果对卫星寿命末期充放电防护设计有指导意义。
위성개질재료재진공배경하적출기유가능대재료본신적개전성능산생현저영향，증가장기복역위성수명말기적충방전풍험。문장이위성상상용적취선아알재료위대상，통과지면90Sr-90Y복조원가속복조시험연구료재재료진공출기후기표면충전평형부전위적변화，병거차계산출재료전도솔적변화규률。결과현시，재5 pA/cm2전자복조강도하，취선아알양품적전도솔수착출기량적증가이명현하강，재총질량손실체도0.5%시，전도솔감소일반좌우。초보분석료출기도치전도솔하강적물리궤제。연구결과대위성수명말기충방전방호설계유지도의의。
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.