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Thursday, November 19, 2020 | History

4 edition of Durability issues for the protection of materials from atomic oxygen attack in low Earth orbit found in the catalog.

Durability issues for the protection of materials from atomic oxygen attack in low Earth orbit

Durability issues for the protection of materials from atomic oxygen attack in low Earth orbit

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  • 32 Currently reading

Published by National Aeronautics and Space Administration, Glenn Research Center in [Cleveland, Ohio] .
Written in English


Edition Notes

StatementBruce Banks, Mary Lenczewski, Rikako Demko.
SeriesNASA/TM -- 2002-211830., NASA technical memorandum -- 211830.
ContributionsLenczewski, Mary., Demko, Rikako., NASA Glenn Research Center.
The Physical Object
FormatMicroform
Pagination1 v.
ID Numbers
Open LibraryOL17634849M
OCLC/WorldCa57137210

Atomic oxygen (AO) effects on materials have long been a critical concern in designing spacecraft to withstand exposure to the Low Earth Orbit (LEO) environment. The objective of this research effort was to provide technical expertise in the design of instrumentation and experimental techniques for analyzing materials exposed to atomic oxygen. To protect substrate materials from the harmful environments, this research investigated the protective effect of nanocomposite film under a simulated low earth orbit space environment involving 4 × 10 −4 torr high vacuum, nm ultraviolet radiation, 14 thermal cycles ranging from −70℃ to ℃, and atomic oxygen flux of × 10 Get this from a library! Protection of materials and structures from the low Earth orbit space environment: proceedings of ICPMSE-3, Third International Space Conference, held in Toronto, Canada, April , [Jacob I Kleiman; Roderick C Tennyson;] -- "The ICPMSE-3 meeting and its proceedings are very important since they came in the wake of the official closure of the LDEF program. Get this from a library! Protection of materials and structures from space environment: ICPMSE [Jacob I Kleiman; Zelina Iskanderova;] -- "The proceedings of ICPMSE-6 conference contain the latest developments in the area of the effects of the space environment on materials and structures and the ways to prevent and/or reduce them. For.

This review permits comparison of mechanisms of protection against UV used by living things and the effect of UV radiation on materials derived from natural products and polymers and rubber. \ucbr\ue\ucbr\uePhotophysics, discussed in the second chapter, helps to build understanding of physical phenomena occurring in materials when.


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Durability issues for the protection of materials from atomic oxygen attack in low Earth orbit Download PDF EPUB FB2

Durability Issues for the Protection of Materials From Atomic Oxygen Attack in Low Earth Orbit Article (PDF Available) September with 81 Reads How we measure 'reads'.

Low Earth orbital atomic oxygen is capable of eroding most polymeric materials typically used on spacecraft. Solar array blankets, thermal control polymers, and carbon fiber matrix composites are readily oxidized to become thinner and less capable of supporting the loads imposed upon them.

Protective coatings have been developed that are or become durable to atomic oxygen Cited by: 7. Durability Issues for the Protection of Materials from Atomic Oxygen Attack in Low Earth Orbit Low Earth orbital atomic oxygen is capable of eroding most polymeric materials typically used on spacecraft.

Solar array blankets, thermal control polymers, and carbon fiber matrix composites are readily oxidized to become thinner and less capable of supporting the loads imposed upon by: 7.

The atomic oxygen undercutting energy dependence predictions enable one to predict mass loss that would occur in low Earth orbit, based on lower energy ground laboratory atomic oxygen. Atomic Oxygen Protection of Materials in Low Earth Orbit Spacecraft polymeric materials as well as polymer-matrix carbon-fiber composites can be significantly eroded as a result of exposure to atomic oxygen in low Earth orbit (LEO).

Several new materials now exist, as well as modifications to conventionally used materials, that provide much more resistance to atomic oxygen attack. Atomic oxygen is formed in the low Earth orbital environment (LEO) by photo dissociation of diatomic oxygen by short wavelength.

Atomic Oxygen Effects on Spacecraft Materials Low Earth orbital (LEO) atomic oxygen cannot only erode the external surfaces of polymers on spacecraft, but can cause degradation of surfaces internal to components on the spacecraft where openings to the space environment exist.

Although atomic oxygen attack on internal or interior surfaces may not have direct exposure to the LEO atomic oxygen. The presence of Atomic Oxygen (AO) in the Low Earth Orbit (LEO) environment is considered one of the main reasons for the degradation of the surfaces exposed to the Space Environment A spacecraft’s orbital velocity of km sec-1 may expose a spacecraft to a stream of AO at energy of approximately 5 eV.

At this energy, atomic oxygen initiates a number of chemical and. Atomic Oxygen Attack in Low Earth Orbit,” NASA/TM— August,Paper IAC- presented at the 53 International As tronautical Congress, The World Space Congress— The atmosphere in low Earth orbit is comprised of about 96% atomic oxygen.

In the early days of NASA's space shuttle missions, the presence of atomic oxygen caused problems. "In the first few shuttle flights, materials looked frosty because they were actually being eroded and textured," says Bruce Banks, a senior physicist with Alphaport.

Banks, et. al., (), The Use of Plasma Ashers and Monte Carlo Modeling for the Projection of Atomic Oxygen Durability of Protected Polymers in Low Earth Orbit, 17th Space Simulation Conference, Baltimore, MD, November 9– Google Scholar. Banks, B., Lenczewski, M., and Demko, R., “ Durability Issues for the Protection of Materials from Atomic Oxygen Attack in Low Earth Orbit,” NASA TM– August,Paper IAC– presented at the 53 International Astronautical Congress, The World Space Congress –Houston TX, October 10–19, Hydrocarbon polymers that are exposed to atomic oxygen in low Earth orbit are slowly oxidized which results in recession of their surface.

Atomic oxygen protective coatings have been developed which are both durable to atomic oxygen and effective in protecting underlying polymers. materials used on spacecraft in low Earth orbit will be addressed.

Analysis of in-space results to determine the causes of successes and failures of atomic oxygen protective coatings is presented.

Issues and considerations involved in providing atomic oxygen protection for materials used on spacecraft in low Earth orbit will be addressed. Analysis of in-space results to determine the causes of successes and failure of atomic oxygen protective coatings is presented.Third International Conference on Protection of Materials and Structures from the Low Earth Orbit Space Environment, Toronto, Canada, 25 – 26 AprilNASA TM 8.

Banks, B.A., Demko, R., Atomic Oxygen Protection of Materials in Low Earth Orbit, NASA TM– (February ). Low Earth Orbital Atomic Oxygen Interactions With Spacecraft Materials Atomic oxygen, formed in Earth s thermosphere, interacts readily with many materials on spacecraft flying in low Earth orbit (LEO).

All hydrocarbon based polymers and graphite are easily oxidized upon the impact of approx eV atomic oxygen as the spacecraft ram into the residual atmosphere.

Therefore, with proper pre-treatment, silicone can be either a wire insulation material or a coating on wire insulation materials to provide atomic-oxygen durability.

1 INTRODUCTION Spacecraft in low Earth orbit ( to km) are subject to attack by atomic oxygen (Ref. 1 and 2). Issues and Effects of Atomic Oxygen Interactions With Silicone Contamination on Spacecraft in Low Earth Orbit The continued presence and use of silicones on spacecraft in low Earth orbit (LEO) has been found to cause the deposition of contaminant films on surfaces which are also exposed to atomic oxygen.

II Banks, B.A. de Groh, K., Rutledge, S., and Difilippo, F.; "Prediction of In-space Durability of Protected Poly- mers Based on Ground Laboratory Thermal Energy Atomic Oxygen," NASA TM- 1presented at the 3rd International Conference for Protection of Materials and Structures from Low Earth Orbit Space Environ- ment.

1. Introduction. Under the microgravity environments of the low earth orbit (LEO), atomic oxygen (AO) is the most of the abundant elements in space environment.According to early shuttle flights results of Skylab mission, it has been found that atomic oxygen is easier to produce readily damaging erosion for exposed materials surfaces, especially for polymer materials.

Defects in atomic oxygen protective coatings can enable atomic oxygen to react and oxidize the underlying polymeric material. The number and area of atomic oxygen defects is dependent upon surface irregularities, contamination during protective coating deposition, flexure or abrasion during materials processing, and micrometeoroid or debris.

Atomic Oxygen Durability Testing of an International Space Station Solar Array Validation Coupon An International Space Station solar array validation coupon was exposed in a directed atomic oxygen beam for space environment durability testing at the NASA Lewis Research Center.

Exposure to atomic oxygen and intermittent tensioning of the solar array were conducted to. Durability Issues for the Protection of Materials from Atomic Oxygen Attack in Low Earth Orbit Banks, B., Lenczewski, M., and Demko, R. 53rd International Astronautical Congress, The World Space Congress �Houston, TX, October   The space environment is especially harsh towards polymers.

The main hazards of the natural low earth orbit (LEO) environment include UV radiation, atomic oxygen (ATOX) atmosphere, ionizing radiation, plasma, meteoroids, debris, high vacuum, thermal cycles and electrostatic charging.

Banks, B. A., Auer, B. Rutledge, S. K., de Groh, K. and Gebauer, L., “The Use of Plasma Ashers and Monte Carlo Modeling for the Projection of Atomic Oxygen Durability of Protected Polymers in Low Earth Orbit,” 17th Space Simulation Conference Terrestrial Test for Space Success, NASA CP,pp.

37– Google Scholar. surface in LEO the average flux is atoms/cm2s and the impact velocity is km/ LEO, atomic oxygen exists in the ground electronic state with two unpaired electrons. The energetic collisions of atomic oxygen with surfaces cause oxidation and erosion.

An experiment designed to measure the atomic oxygen (AO) erosion profile of scattered AO was exposed to Low Earth Orbital (LEO) AO for almost four years as part of the Materials International Space Station Experiment 1 and 2 (MISSE 1 and 2).

The experiment was flown in MISSE Passive Experiment Carrier 2 (PEC 2), Tray 1, attached to the exterior of the International Space Station (ISS). Abstract. Prediction and evaluation of erosion effects in polymeric materials and carbon fibre reinforced plastic composites in low Earth orbit (LEO) due to interaction with atomic oxygen are very important issues for these materials’ durability evaluation and expectation of performance in space missions.

The LEO atomic oxygen environment, its interactions with materials, results of space testing, computational modeling, mitigation techniques, and ground laboratory simulation procedures and issues are presented. SUBJECT TERMS Atomic oxygen; Durability in low Earth orbit NUMBER OF PAGES 25 PRICE CODE Destructive Power of Atomic Oxygen Used to Restore Artwork: NASA research into the damage to satellites caused by atomic oxygen in low Earth orbit has led to a new way to restore damaged artwork.

Atomic oxygen is an elemental form of oxygen that does not exist in Earth. Banks, B., Lenczewski, M., and Demko, R., “Durability Issues for the Protection of Materials from Atomic Oxygen Attack in Low Earth Orbit,” NASA TM, AugustPaper IAC, Presented at the 53rd International Astronautical Congress, The World Space Congress –Houston, TX, October "A Technique for Synergistic Atomic Oxygen and Vacuum Ultraviolet Radiation Durability Evaluation of Materials for use in Low Earth Orbit", prepared for the 3rd International Conference on Protection of Materials and Structures from the Low Earth Orbit Space Environment cosponsored by the Canadian Space Agency and the Institute for Space and.

Hyperthermal atomic oxygen durable transparent silicon-reinforced polyimide Show all authors. Min Qian. Effect of low earth orbit atomic oxygen on spacecraft materials.

“Protection of Materials and Structures from the LEO Space Environment”, (Organizers: J. Kleiman and E. Werling), Arcachon. Atomic oxygen is formed in the low Earth orbital environment (LEO) by photo dissociation of diatomic oxygen by short wavelength nm) solar radiation which has sufficient energy to break the eV O2 diatomic bond in an environment where the mean free path is sufficiently long ( meters) that the probability of reassociation or the formation of ozone (O3) is small.

Polymeric materials used in spacecraft require to be protected with an atomic oxygen (AO)‐resistant layer because AO can degrade these polymers when spacecraft serves in low earth orbit (LEO) environment. However, mechanical damage on AO‐resistant coatings can expose the underlying polymers to AO erosion, shortening their service life.

Banks, B., Lenczewski, M., and Demko, R., “Durability Issues for the Protection of Materials from Atomic Oxygen Attack in Low Earth Orbit,” NASA/TM—, AugustPaper IAC–02–, presented at the 53 International Astronautical Congress, The World Space Congress—, Houston TX, October 10–19, experiment, exposed samples to primarily atomic oxygen (~1 X atoms/cm2).

The objective of the AOE experiment, which was flown in August aboard the space shuttle Discovery (STS), was to expose material samples to low Earth orbit (LEO) atomic oxygen (AO) and return them to Earth for subsequent characterization and assessment of.

Environmental Durability Issues for Solar Power Systems in Low The exposure of silicones to atomic oxygen in low Earth orbit causes oxidation of the surface, resulting in conversion of silicone to silica.

The use of silicone coatings for the protection of materials from atomic oxygen attack is limited because of the eventual exposure of. The durability of cyanate ester (CE) to hyperthermal atomic oxygen (AO) attack in low Earth orbit may be enhanced by the addition of carbon fiber to form a carbon fiber-reinforced cyanate ester composite (CFCE).

Low earth orbit (LEO) space missions have shown that an ambient atomic oxygen (AO) environment interacts with spacecraft materials, resulting in surface erosion and significantly affects the performance of the materials, particularly polymeric films.

Protection against AO attack is ensured on the front and rear side faces of the Kapton film. Atomic oxygen is one of the leading candidates which causes the degradation of materials in space. That's because atomic oxygen is highly .concentrators is atomic oxygen attack of the underlying silver at seams and edges or at micrometeoroid and debris (MMD) impacts sites.

Second surface silver microsheet glass concentrator samples were fabricated and tested for atomic oxygen durability. The samples were iteratively exposed to an atomic oxygen environment in a plasma asher.