导电型OSR热控性能与抗静电性能的反向关联机制研究
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摘要
卫星用导电型OSR(Optical Solar Reflector,简称OSR)采用铟锡氧化物(Indium Tin Oxide,简称ITO)作为表面防静电放电涂层薄膜,但该ITO薄膜同时又产生了OSR太阳能吸收率的提高和红外发射率的降低,即OSR热控性能的方向下降,本文旨在揭示该薄膜的静电防护与其热控性能的反向关联机制。首先,结合热辐射定理分析了ITO薄膜抗静电参数对其太阳能吸收和红外发射率的影响;然后,对ITO薄膜的主要抗静电参数进行理论分析,包括表面方阻、次级电子发射特性、太阳能吸收率和发射率等,并且得出这些参数与OSR的热控制参数之间存在强反向关联机制;最后基于太阳能吸收、红外发射率及其比值的预测值与相关实验结果的比较,发现ITO薄膜表面方阻的降低,既带来了其抗静电性能的下降,同时又反向增加了OSR太阳能吸收值,即将导致OSR的热控性能退化。因此,导电型OSR存在的该反向关联机制不容忽视,即用于它表面的ITO薄膜的抗静电参数的设计原则应进一步优化,以保证其在航天器热控制环境等领域的长寿命稳定工作。
引文
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[3]Howard,S.,Kanner,C.,Irvin S.,"Recession curve generation for space shuttle solid rocket booster thermal protection system coatings,"AIAA.3334(2002).
[4]Ma,W.,Xuan,Y.M.,Han,Y.G.,Li,Q.,"Degradation performance of long-life satellite thermal coating and its influence on thermal character,"Journal of Astronautics.Papers31(2),568-569(2010).
[5]常天海.氧化铟锡薄膜在光学太阳反射镜上的应用[J].华南理工大学学报(自然科学版),2003,31(9):40—43.
[6]Strganac,T.W.,Letton,J.,Adam,S.,Zwiener,J.,and Loebs,V.,"Space environment effects on damping of polymer matrix carbon fiber composites,"J Spacecraft Rockets.Papers 37(4),519-525(2000).
[7]Wen,Y.P.,Liu,Q.,"Status and development of spacecraft thermal control technology,"Proc.Space Thermal Physics 5,67-72(2000).
[8]Finckenor,M.,Visentime,A.,Rock,N.I.,Zwiener,J.,and Loebs,V.,"Coatamation,UV Radiation,and atomic oxygen effects on ISS thermal control materials,"AIAA.1084(2003).
[9]Hua,C,S.,"Countermeasures of improving the reliability of satellite thermal control system,"Spacecraft Engineering.Papers 4(1),34-42(1996).
[10]Min,G.R.,and Guo,X.,[Spacecraft Thermal Control],Science Press,Beijing,2(1985).
[11]Shao,R.,Z.,and Fan,B.Y.,"Reliability study of long-life communication satellites,"Chinese Space Sci.and Tech.Papers 8(4),24-33(1996).
[12]Wang,S.,H.,and Hu,B.S.,"Tin-doped indium oxide films used in the secondary surface mirror,"Vacuum&Cryogenics.Papers 11(1),18-23(1992).
[13]Zhang,W.,J.,Wang,T.M.,and Zhong,L.Z.,"Theoretical study of infrared emissivity of indium tin oxide films,"ACTA Physica Sinica.Papers 54(9),4439-4444(2005).