Accession Number : ADA255909
Title : Space Environmental Effects on Silvered Teflon Thermal Control Surfaces
Descriptive Note : Technical rept.
Corporate Author : AEROSPACE CORP EL SEGUNDO CA TECHNOLOGY OPERATIONS
Personal Author(s) : Hemminger, C S ; Stuckey, W K ; Uht, J C
Report Date : 15 Sep 1991
Pagination or Media Count : 26
Abstract : Cumulative space environmental effects on Ag/FEP were a function of exposure orientation. Samples from 19 silvered Teflon (Ag/FEP) thermal control surfaces recovered from the Long Duration Exposure Facility (IDEF) have been analyzed to determine changes in this material as a function of position on the spacecraft. Although solar absorptance and infrared emittance of measured thermal blanket specimens are relatively unchanged from control specimen values, significant changes in surface morphology, composition, and chemistry were observed. All Ag/FEP surfaces exposed to high atomic oxygen flux (rows 7-11), irrespective of exact angle, had a uniformly cloudy appearance due to surface erosion. Scanning electron microscopy (SEM) showed a surface topography with sharp peaks and valleys, while x-ray photoelectron spectroscopy (XPS) detected a surface composition corresponding to contamination-free FEP, with less than 1 mole % oxygen.
Descriptors : *SPACE ENVIRONMENTS , *PROTECTIVE COVERINGS , *TETRAFLUOROETHYLENE RESINS , *BLANKETS , SCANNING , RADIATION , SPECTROSCOPY , TOPOGRAPHY , ELECTRON MICROSCOPY , OXYGEN , EROSION , X RAY PHOTOELECTRON SPECTROSCOPY , PHOTOELECTRONS , RADIATION DAMAGE , CONTROL SURFACES , SILVER , CONTAMINATION , VALUE , EMITTANCE , CHEMISTRY , SURFACES , MICROSCOPY , MORPHOLOGY , SPACECRAFT , DAMAGE
Subject Categories : Plastics
Distribution Statement : APPROVED FOR PUBLIC RELEASE