Effects of Space Exposure on Thermal Control Coatings PDF Download
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Author: Roger C. Linton
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Roger C. Linton
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Joyce A. Dever
Publisher:
ISBN:
Category :
Languages : en
Pages : 18
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Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781722751548
Category :
Languages : en
Pages : 72
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Book Description
The study of long term near ultra-violet (NUV) effects in a vacuum atmosphere, is a crucial element for space applications. NUV radiation causes significant changes in the reflectance of many coatings and types of materials. An ultra high vacuum NUV system was assembled in order to investigate various coatings and materials in this hostile environment. The vacuum is an ion pump that maintains a minimum vacuum in the mid 10(exp -9) range. The system has a base pressure of 10(exp -9) torr and this base pressure is maintained with the ion pump. The NUV exposure was maintained at 2-3 suns which allows accelerated NUV exposure without overheating the samples. The goal of this test was to maintain an intensity of 3.4 x 10(exp -2) Watts/cm(exp 2) which equals 2.9 NUV suns. An NUV sun is defined as 1.16 Watts/cm(exp 2) integrated over wavelength of 200-400 nanometers. OBrien, Susan K. and Workman, Gary L. Marshall Space Flight Center...
Author:
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Category : Space vehicles
Languages : en
Pages : 68
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Author: John H. Henninger
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Category : Space vehicles
Languages : en
Pages : 56
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Author: Robert A. Winn
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Category :
Languages : en
Pages : 46
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This report presents the results of a thermal control coatings experiment on the Air Force P72-1 satellite which was launched into a low earth polar orbit in October 1972. The objectives of this experiment were to measure the amount of degradation of experimental thermal control coatings after exposure to the space environment and to correlate these results with those of exposure for the same coatings measured in a laboratory space simulation chamber. Data during five years of space exposure (more than 26,000 revolutions of the satellite) show that all coatings degraded more than expected. Most of this degradation probably was due to contamination.
Author: Donald J. Progar
Publisher:
ISBN:
Category : Binders (Materials)
Languages : en
Pages : 54
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This paper presents an evaluation of several silicone resin binders and powdered inorganic pigments for potential use in spacecraft thermal-control paint formulations. The pigments were selected on the basis of a hypothesis relating the heat of formation of a compound to the compound's resistance to ultraviolet-radiation-induced degradation. Reflectance measurements were made in situ to determine degradatiorna tes due to ultraviolet radiation. The tested polydimethylsiloxane resins were not significantly affected by long exposures to ultraviolet radiation. All the pigments, which were dispersed in a polydimethylsiloxane resin, were degraded by ultraviolet radiation as determined by an increase of solar absorptance. For the materials evaluated in this study, no evidence was found to indicate that pigments with high heats of formation were resistant to ultraviolet degradation.
Author: A. C. Tribble
Publisher:
ISBN:
Category :
Languages : en
Pages : 68
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Author: National Aeronautics and Space Adm Nasa
Publisher: Independently Published
ISBN: 9781794264274
Category : Science
Languages : en
Pages : 34
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Spacecraft radiators reject heat to their surroundings and coatings play an important role in this heat rejection. The coatings provide the combined optical properties of low solar absorptance and high infrared emittance. The coatings are applied to the radiator panel in a number of ways, including conventional spraying, plasma spraying, or as an applique. Not designed for a terrestrial weathering environment, the durability of spacecraft paints, coatings, and appliques upon exposure to weathering and subsequent exposure to ascent heating, solar wind, and ultraviolet radiation was studied. In addition to traditional aluminum panels, new isocyanate ester composite panels were exposed for a total of 90 days at the Atmospheric Exposure Site of Kennedy Space Center's (KSC) Beach Corrosion Facility for the purpose of identifying their durability to weathering. Selected panel coupons were subsequently exposed to simulated ascent heating, solar wind, and vacuum ultraviolet (UV) radiation to identify the effect of a simulated space environment on as-weathered surfaces. Optical properties and adhesion testing were used to document the durability of the paints, coatings, and appliques. Jaworske, Donald A. and Tuan, George C. and Westheimer, David T. and Peters, Wanda C. and Kauder, Lonny R. Glenn Research Center; Goddard Space Flight Center; Johnson Space Center NASA/TM-2008-215259, E-16525
Author: Mike Kenny
Publisher: BiblioGov
ISBN: 9781289132811
Category :
Languages : en
Pages : 28
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Book Description
Many different passive thermal control materials were flown as part of the Materials on International Space Station Experiment. Engineers and scientists at the Marshall Space Flight Center have analyzed a number of these materials, including Z93P zinc oxide/potassium silicate coating, YB-71P zinc orthotitanate/potassium silicate coating, NZOT, which is a low-cost alternative to YB-71P, several electrically conductive/static dissipative thermal control coatings, as well as black coatings for part marking and automated rendezvous and capture. These were exposed to the low Earth orbital environment of atomic oxygen, ultraviolet radiation, thermal cycling, and hard vacuum, though atomic oxygen exposure was very limited for some samples. Results from the one-year exposure of MISSE-3 and MISSE-4 are compared to the four-year exposure of MISSE-1 and MISSE-2. Solar absorptance, infrared emittance, and mass measurements indicate the durability of these materials to withstand the space environment. The effect of contamination from an active space station on the performance of white thermal control coatings is discussed.
