卫星典型分子污染物吸附脱附试验研究  

Experimental Study on Adsorption and Desorption of Organic Molecular Contaminants in Orbital Satellite

作　　者：焦子龙[1,2] 姜利祥[1,2] 孙继鹏[1,2] 黄建国[1,2] 朱云飞[1,2] 

机构地区：[1]可靠性与环境工程技术重点实验室,北京100094 [2]北京卫星环境工程研究所,北京100094

出　　处：《真空科学与技术学报》2016年第2期229-233,共5页Chinese Journal of Vacuum Science and Technology

基　　金：装备预备研基金项目

摘　　要：在轨运行的卫星容易受到分子污染影响,造成光学、热控等系统敏感表面性能退化,因此必须对分子污染进行控制。分子污染主要来源于材料放气,典型分子污染成分为邻苯二甲酸酯类和硅氧烷类,因此有必要研究其在敏感表面的吸附和脱附规律。本文建立了分子污染物吸附脱附试验系统,由污染物蒸发池、真空低温系统和石英晶体微量天平测量系统组成。建立了试验方法,利用阶梯升温的石英晶体微量天平测量得到平均粘附系数。利用上述试验系统得到了不同温度下典型污染成分邻苯二甲酸二辛酯的粘附系数。对3种工程经验模型进行了比较,找到了与实验数据符合最好的模型。对污染物在表面的脱附进行了测试及分析,提出多层吸附时可以采用蒸发速率公式计算脱附速率。最后对实验系统未来的改进进行了讨论。We experimentally addressed the adsorption and desorption of the typical molecular contaminants,including dioctyl phthalates（DOP） and siloxanes and originated from outgassing of organic materials of orbital satellites,to reduce the contamination-induced degradation of sensitive surfaces of the optical and electronic devices.The experimental setup mainly includes a cryogenic vacuum system,an evaporation crucible and a quartz crystal microbalance.The impact of the surface temperature and heating mode on the DOP＇ s sticking-coefficient and desorption rate was investigated.The measured results were processed with empirical models and data-fitting.The preliminary results show that the surface temperature significantly affects DOP sticking-coefficient,and that Langmuir evaporation equation best describes DOP＇ s desorption in multilayered adsorption.For example,at a temperature ≤-25℃and/or≥20℃,the sticking-coefficient was approximated to be 1 and 0,respectively.We suggest that the surfaces heated up to 201 may not suffer DOP contamination.

关 键 词：分子污染 放气 粘附系数 邻苯二甲酸酯 试验系统 吸附 脱附 

分 类 号：TB332[一般工业技术—材料科学与工程]