3 edition of dependence of atomic oxygen undercutting of protected polyimide Kapton® H upon defect size found in the catalog.
dependence of atomic oxygen undercutting of protected polyimide Kapton® H upon defect size
by National Aeronautics and Space Administration, Glenn Research Center, Available from NASA Center for Aerospace Information in [Cleveland, Ohio], Hanover, MD
Written in English
|Statement||Aaron Snyder and Kim K. deGroh.|
|Series||[NASA technical memorandum] -- NASA/TM-2001-210596., NASA technical memorandum -- 210596.|
|Contributions||De Groh, Kim K., NASA Glenn Research Center.|
|The Physical Object|
The optimum performance was achieved at a PTFE content of about wt.%. The nano-PTFE was said to have a particle size of 20 80 nm (analysis by atomic force microscopy) and some of it was irradiation-grafted with acrylic acid. FTIR study showed that the grafted PTFE contained carboxylic acid groups that could react with the phenol resin. Short Courses Seven Short Courses are being offered in conjunction with the th ECS Meeting. These courses will be held on Sunday, October 4, , from h to h.
( a.m.) ATOHIC OXYGEN UNDERCUTTING OF DEFECTS ON SiD2 PROTECTED POLYIMIDE SOLAR ARRAY BLANKETS: Bruce A, Banks. Sharon K. Rutledge, and Bruce M, Auer, NASA Lewis Research Center, Cleveland, OH ; Frank DiFilippo, Case Western Reserve University, Cleveland, OH Low Earth Orbital (LEO) atomic oxygen can oxidize polyimide. Corresponding Author ([email protected]) b In this study, CuSn10 metal matrix composites (MMCs) reinforced with 0, 1, 3 and 5 vol.% graphite particulates, respectively, were produced by powder abrasive papers of grit size , having an average particle size of 38 μm, were used. The applied loads were selected as 60N.
Polyimide (Vespel SP-1) N/A N/A the crack length at the sample surface is used to define size of the defect. A survey of any probability-of-detection curve for penetrant inspection will quickly lead one to the conclusion that crack length has a definite affect on sensitivity. the amount of sound that reflects from a. Atomic oxygen (AO) present in LEO is known to be the principal agent in causing undercutting erosion of SiO(x) protected polyimide Kapton (R) H film, which serves as a mechanically stable blanket material in solar arrays. The rate of undercutting is dependent on the rate of arrival, directionality and energy of the AO with respect to the film.
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The Dependence of Atomic Oxygen Undercutting of Protected Polyimide Kapton(tm) H Upon Defect Size Article July with 22 Reads How we measure 'reads'. Get this from a library. The dependence of atomic oxygen undercutting of protected polyimide Kapton® H upon defect size. [Aaron Snyder; Kim K.
The Dependence of Atomic Oxygen Undercutting of Protected Polyimide Kapton(tm) H upon Defect Size. Atomic oxygen (AO) present in LEO is known to be the principal agent in causing undercutting erosion of SiO(x) protected polyimide Kapton(R) H film, which serves as a mechanically stable blanket material in solar arrays.
Author: Kim K. deGroh and Aaron Snyder. Energy Dependence of Atomic Oxygen Undercutting of Protected Polymers Bruce A. Banks Lewis Research Center, Cleveland, Ohio undercutting dependence upon defect size must be taken into account. atoms/cm 2 exposure on protected polyimide Kapton with a defect crack width of x cm.
This undercut. Monte Carlo models have been developed for protected Kapton polyimide. MLI sample revealed wide undercutting at defect area of atomic oxygen defects is dependent upon. The polyimide samples with the size of mm × mm were positioned 15 cm away from the exit of the curved filtered duct, and treated in the Al plasma for 60 min and then in Si plasma for 60 min with a negative pulse bias of 10 kV with pulse width of μs and repetition rate of 60 Hz.
K.K. de GrohThe Dependence of Atomic Oxygen. Fig. 11 shows the defect size influences on undercutting profiles with μm, μm and μmm defect width, respectively.
As defect width increases, atomic oxygen undercutting profiles are changed greatly, where the undercutting areas and the ratio of neck width to maximum undercutting width takes on the increasing tend. Computational prediction of atomic oxygen undercutting at defect sites in protective coatings for various arrival energies was investigated.
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 beam systems. 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. NASA/TM— 11 2 \i.m & (a) Kapton" H polyimide after an atomic oxygen fluence of x10^° atoms/cm^ (b) Fluorinated ethylene propylene (FEP) Teflon after oxygen an atomic oxygen fluence of x10^' atoms/cm^ (c) Chlorotrifluoroethylene after an atomic oxygen fluence of x10^' atoms/cm^ at degrees off ram on row 9 Figure “The Dependence of Atomic Oxygen Undercutting of Protected Kapton® H Upon Defect Size,” prepared for the Eighth International Symposium in a Space Environment and Fifth International Conference on Protection of Materials and Structures from the LEO Space Environment, NASA TM, Arachon, France, June The most well-characterized atomic oxygen erosion yield is that of polyimide Kaptons H, which has an erosion yield of 3 cm3/atom for LEO eV atomic oxygen,13 Table (14,15,16) lists the atomic oxygen erosion yields of a wide variety of polymers, where many of the values were measured from space experiments and others are.
( millimeter) thick Kapton H polyimide blanket as shown in figure I. The mechanical ability of the array blanket to provide support for the solar cells and the flexible printed circuitry is highly dependent upon the atomic oxygen durability of the SiOx protected Kapton.
Defects in the protective coatings can exist because of particulate. An illustration of an open book. Books. An illustration of two cells of a film strip. Video. An illustration of an audio speaker. Audio. An illustration of a " floppy disk. Software. An illustration of two photographs.
Images. An illustration of a heart shape Donate. An illustration of text ellipses. Atomic oxygen undercutting at defect sites in protective coatings on graphite epoxy composites indicates that between 40 to percent of the atomic oxygen thermally accommodates upon impact, and that the reaction probability of thermally accommodated atomic oxygen may range from x10 -6 to 2.
lxl0 -3, depending upon the degree of thermal. In today’s nanoworld, there is a strong need to manipulate and process materials on an atom-by-atom scale with new tools such as reactive plasma, which in some states enables high selectivity of interaction between plasma species and materials.
These interactions first involve preferential interactions with precise bonds in materials and later cause etching. This typically occurs. Metal deterioration via corrosion is a ubiquitous and persistent problem. Ångström-scale, atomically thin 2D materials are promising candidates for effective, robust, and economical corrosion passivation coatings due to their ultimate thinness and excellent mechanical and electrical properties.
This review focuses on elucidating the mechanism of 2D materials in. Inadequate to define small feature size less than 1 µm, handling of hazardous chemicals, contamination issues, ecologically unfriendly technology with need of waste processing.
Only isotropic etching. High equipment cost, implementation dependent on application, potential radiation damage. Can be isotropic or anisotropic. The results showed that film quality strongly depends on the pH and H 2 O% values in the electrolyte with optimized Al 2 O 3 films achieved at pH = 6 and H 2 O% = These high-quality nm thick Al 2 O 3 films exhibit a very low current density of 10 –8 A cm –2 at 3 MV cm –1 and a high breakdown field of MV cm –1.
Search the leading research in optics and photonics applied research from SPIE journals, conference proceedings and presentations, and eBooks. George H. Miley Proc. SPIEHigh-Power Laser Ablation, pg (14 September ); doi: / Read Abstract +.However, hydrogen (k D = Å) was less affected by aging-induced physical densification than oxygen (k D = Å) due to its smaller size, and thus oxygen permeability dropped more with time than hydrogen permeability for any polymer.
The gains in H 2 /N 2 selectivity thus outweighed the losses in H 2 permeability, as expected. It is. It has been reported that EBL patterned open nanotrenches can be sealed by atomic layer deposition (ALD) to form sub 10 nm channels.
35 S. W. Nam, M. H. Lee, S. H. Lee, D. J. Lee, S. M. Rossnagel, and K. B. Kim, “ Subnm nanochannels by self-sealing and self-limiting atomic layer deposition,” Nano Lett. 10(9), – ().