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  • 1
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    Characterization of a 5-eV neutral atomic oxygen beam facility (1991)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: An experimental effort to characterize an existing 5-eV neutral atomic oxygen beam facility being developed at Princeton Plasma Physics Laboratory is described. This characterization effort includes atomic oxygen flux and flux distribution measurements using a catalytic probe, energy determination using a commercially designed quadrupole mass spectrometer (QMS), and the exposure of oxygen-sensitive materials in this beam facility. Also, comparisons were drawn between the reaction efficiencies of materials exposed in plasma ashers, and the reaction efficiencies previously estimated from space flight experiments. The results of this study show that the beam facility is capable of producing a directional beam of neutral atomic oxygen atoms with the needed flux and energy to simulate low Earth orbit (LEO) conditions for real time accelerated testing. The flux distribution in this facility is uniform to +/- 6 percent of the peak flux over a beam diameter of 6 cm.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: NASA, Lyndon B. Johnson Space Center, Fourth Annual Workshop on Space Operations Applications and Research (SOAR 90); p 764-771
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Effects of long duration exposure to simulated space environment on nonmetallic materials properties (1983)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: Nonmetallic materials specimens from the Viking program were tested in situ invacuo after continuous thermal vacuum exposure from 1971/1972 to the present. Eleven tests were done on appropriate specimens of 30 materials; however, no single material received all the tests. Some specimens also were exposed to 1 or 2.5 MeV electrons at differing fluences before testing. Baseline exposure data is reported for graphite/epoxy specimens that were exposed to vacuum since 1974. These materials were transferred to the thermal vacuum storage facility for future in situ testing and irradiation. Thin G/E specimens were tensile tested after thermal-vacuum cycling exposure. Photomicrographic examinations and SEM analyses were done on the failed specimens.
    Keywords: NONMETALLIC MATERIALS
    Type: AGARD Environ. Effects on Mater. for Space Appl.; 14 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Performance of thermal control tape in the protection of composite materials to space environmental exposure (1992)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Thermal control tape flown on the Long Duration Exposure Facility (LDEF) experiment A0171 has shown to be effective in protecting epoxy fiberglass composites from atomic oxygen and ultraviolet degradation. The tape adhesive performed well. The aluminum, however, appeared to have become embrittled by the 5.8 years of space radiation exposure.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-TM-103582 , NAS 1.15:103582
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Protective coatings for atomic oxygen susceptible spacecraft materials - STS-41G results (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Sixteen materials consisting of metallizations, silicones, and FEP Teflon were applied as protective coatings to selected spacecraft material surfaces and exposed on STS-41G to the LEO atomic oxygen environment. Evaluations of their protective effectiveness were made through assessing their mass loss/gain characteristics, maintenance of base material optical properties, and imperviousness to atomic oxygen attack. Generally, all coatings provided some degree of protection for the underlying material. In some cases the overcoat appeared to be too thin thereby providing inadequate protection.
    Keywords: NONMETALLIC MATERIALS
    Type: AIAA PAPER 85-7017
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Evaluation of materials for high performance solar arrays (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A program has been underway to evaluate materials for advanced solar arrays which are required to provide power to weight ratios up to 100 W/kg. Severe mission environments together with the lack of knowledge of space environmental materials degradation rates require the generation of irradiation and outgassing engineering data for use in the initial design phase of the flight solar arrays. Therefore, approximately 25 candidate array materials were subjected to selected mission environments of vacuum, UV, and particle irradiation, and their mechanical and/or optical properties were determined where appropriate.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-TP-1220 , M-252
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Atomic oxygen resistant protective coatings for the Hubble Space Telescope solar array in low earth orbit (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The Hubble Space Telescope back-up solar array (BSFR-ATOX) was designed with atomic oxygen resistant materials to replace the original high efficiency cell (HEC) array. Pending qualification of the BSFR-ATOX array, protective coatings for application to the existing HEC array were evaluated. Three polysiloxane-type coating materials, SWS V-10, DC-100, and CV-1144 were evaluated with respect to atomic oxygen resistance, outgassing, contamination potential, stability under UV irradiation, electron-proton irradiation, thermal cycling, and long-term storage after application. Atomic oxygen testing included characterization of the atomic oxygen plasma using comparison of Kapton reaction to existing flight data, residual gas analysis, and temperature measurements. Results from these tests show DC-100 as a greater contamination concern if used in the vicinity of sensitive optical surfaces, i.e., solar cell cover glasses. The SWS V-10 and CV-1144 coatings met all acceptance criteria.
    Keywords: NONMETALLIC MATERIALS
    Type: International Conference; Apr 17, 1989 - Apr 21, 1989; San Diego, CA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Analyses of spacecraft polymeric materials (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Partial analytical characterizations are made by four different techniques of three polymeric materials used in conjunction with the Space Telescope for samples flown on mission STS-8. The polymers were Tedlar, Kapton H, and Kapton F. The surfaces of the three polymers were attacked and oxidized by atomic oxygen, and fluorine is lost from the surface of Kapton F, largely due to displacement by atomic oxygen.
    Keywords: NONMETALLIC MATERIALS
    Type: Journal of Spacecraft and Rockets (ISSN 0022-4650); 23; 350-352
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Materials resistance to low earth orbit environmental effects (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A number of flexible polymeric materials have been considered as condidates for protective coatings on Kapton film. These coatings have been tested under a variety of environments, each of which simulates one or more aspects of the low earth orbit space environment. Mass loss rates vs fluence and temperatue, optical properties, and surface characteristics under exposure to the various environments will be presented. Kinetics data on Kapton and other materials is interpreted in terms of bond strengths and relative thermodynamic stabilities of potential products. Activation energy for degradation of Kapton by oxygen atoms was determined to be 30 + or - 5 kJ/mol. Materials tested include silicones, fluorosilicones, fluorophosphazenes, fluorocarbons, and hydrocarbons.
    Keywords: NONMETALLIC MATERIALS
    Type: International SAMPE Symposium and Exhibition; May 08, 1989 - May 11, 1989; Reno, NV; United States
    Format: text
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    NASA TECHNICAL REPORTS
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