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The effects of simulated low earth orbit environments on spacecraft thermal control coatings
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Stueber, Thomas J. Dever, Joyce A. Bruckner, Eric J. Stidham, Curtis R. Rutledge, Sharon K. Booth, Roy E. |
| Copyright Year | 1993 |
| Description | Candidate Space Station Freedom radiator coatings including Z-93, YB-71, anodized aluminum and SiO(x) coated silvered Teflon have been characterized for optical properties degradation upon exposure to environments containing atomic oxygen, vacuum ultraviolet (VUV) radiation, and/or silicone contamination. YB-71 coating showed a blue-gray discoloration, which has not been observed in space, upon exposure in atomic oxygen facilities which also provide exaggerated VUV radiation. This is evidence that damage mechanisms occur in these ground laboratory facilities which are different from those which occur in space. Radiator coatings exposed to an electron cyclotron resonance (ECR) atomic oxygen source in the presence of silicone-containing samples showed severe darkening from the intense VUV radiation provided by the ECR and from silicone contamination. Samples exposed to atomic oxygen from the ECR source and to VUV lamps, simultaneously, with in situ reflectance measurement, showed that significantly greater degradation occurred when samples received line-of-site ECR beam exposure than when samples were exposed to atomic oxygen scattered off of quartz surfaces without line-of-site view of the ECR beam. For white paints, exposure to air following atomic oxygen/VUV exposure reversed the darkening due to VUV damage. This illustrates the importance of in situ reflectance measurement. |
| File Size | 8881411 |
| Page Count | 18 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19930017830 |
| Archival Resource Key | ark:/13960/t2d847s2h |
| Language | English |
| Publisher Date | 1993-05-01 |
| Access Restriction | Open |
| Subject Keyword | Spacecraft Design, Testing And Performance Cyclotron Radiation Earth Orbital Environments Discoloration Cyclotron Resonance Environmental Tests Spacecraft Construction Materials Oxygen Atoms Thermal Protection Low Earth Orbits Spacecraft Contamination Anodizing Far Ultraviolet Radiation Optical Properties Spacecraft Environments Space Station Freedom Temperature Control Protective Coatings Silicones Paints Aluminum Coatings Satellite Temperature Reflectance Teflon Trademark Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
