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1、Availableonlineatwww.sciencedirect.comAdvancesinSpaceResearch50(2012)1411–1424www.elsevier.com/locate/asrDegradationofthermalcontrolmaterialsunderasimulatedradiativespaceenvironment⇑A.K.Sharma,N.SridharaThermalSystemsGroup,ISROSatelliteCentre,VimanapuraPost,Bangalore560017,IndiaReceived29Septe
2、mber2011;receivedinrevisedform7July2012;accepted15July2012Availableonline20July2012AbstractAspacecraftwithapassivethermalcontrolsystemutilizesvariousthermalcontrolmaterialstomaintaintemperatureswithinsafeoperatinglimits.Materialsusedforspacecraftapplicationsareexposedtoharshspaceenvironmentssu
3、chasultraviolet(UV)andparticle(electron,proton)irradiationandatomicoxygen(AO),undergophysicaldamageandthermaldegradation,whichmustbeconsideredforspacecraftthermaldesignoptimizationandcosteffectiveness.Thispaperdescribestheeffectofsynergisticradiationonsomeoftheimportantthermalcontrolmaterialstov
4、erifytheassumptionsofbeginning-of-life(BOL)andend-of-life(EOL)properties.Studiesonthedegradationintheopticalproperties(solarabsorptanceandinfraredemittance)ofsomeimportantthermalcontrolmaterialsexposedtosimulatedradiativegeostationaryspaceenvironmentarediscussed.Thecurrentstudiesarepurelyrelat
5、edtotheinfluenceofradiationonthedegradationofthematerials;otherenvironmentalaspects(e.g.,thermalcycling)arenotdiscussed.Thethermalcon-trolmaterialsinvestigatedhereinincludedifferentkindofsecond-surfacemirrors,whiteanodizing,whitepaints,blackpaints,multilayerinsulationmaterials,varnishcoatedalumi
6、nizedpolyimide,germaniumcoatedpolyimide,polyetheretherketone(PEEK)andpolytetrafluoroethylene(PTFE).Forthispurpose,atestintheconstantvacuumwasperformedreproducingathreeyearradiativespaceenvi-ronmentexposure,includingultravioletandchargedparticleeffectsonNorth/Southpanelsofageostationarythree-axis
7、stabilizedspace-craft.Reflectancespectraweremeasuredinsituinthesolarrange(250–2500nm)andthecorrespondingsolarabsorptancevalueswerecalculated.Thetestmethodologyandthedegradationsofthematerialsarediscussed.Themostimportantdegradationsamong
