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  • 1
    Electronic Resource
    Electronic Resource
    Plasma and beam facility atomic oxygen erosion of a transition metal complex (1996)
    Springer
    Plasma chemistry and plasma processing 16 (1996), S. 209-225 
    Details
    ISSN: 1572-8986
    Keywords: Atomic oxygen ; erosion ; plasma ; atomic beam facility ; zirconium complex ; weight loss ; optical photography ; profilometry ; diffuse reflectance spectroscopy ; total transmittance spectroscopy ; scanning electron microscopy ; wavelength dispersive X-ray spectroscopy ; X-ray diffraction ; X-ray photoelectron spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract Glassy residues of the complex bis(N,N′-disalicylidene-1,2-phenylenediamino)zirconium(IV), Zr(dsp)2, on glass slides were exposed to atomic oxygen in a plasma asher or an atomic beam facility for various amounts of lime in order to study the erosion process, determine the rate of erosion, and learn the chemical identity of the residue. The exposed films were characterized by weight loss, optical photography, profilometry, diffuse reflectance and total transmittance spectroscopy, scanning electron microscopy (SEM) with wavelength dispersive X-ray spectrometry (WDS), X-ray diffraction, and X-ray photoelectron spectroscopy (XPS). Results indicate that these films erode much more slowly polyimide (Kapton™) film under identical conditions, that the erosion is very nonuniform, and that zirconium dioxide is the predominant product after extended exposure. This complex is currently being evaluated as a polymer additive.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01570179
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Ion beam sputter-deposited diamondlike films (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: (Previously announced in STAR as N82-28445)
    Keywords: SOLID-STATE PHYSICS
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  • 3
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    Ion beam sputter-deposited thin film coatings for protection of spacecraft polymers in low earth orbit (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Ion beam sputter-deposited thin films at Al2O3, SiO2, and a codeposited mixture of predominantly SiO2 with small amounts of fluoropolymer were evaluated both in laboratory plasma ashing tests and in space on board Shuttle flight STS-8 for effectiveness in preventing oxidation of polyimide Kapton. Measurements of mass loss and optical performance of coated and uncoated polyimide samples exposed to the low earth orbital environment are presented. Optical techniques were used to measure loss rates of protective films exposed to atomic oxygen. Results of the analysis of the space flight exposed samples indicate that thin film metal oxide coatings are very effective in protecting the polyimide. Metal oxide coatings with a small amount of fluoropolymer codeposited have the additional benefit of great flexibility.
    Keywords: NONMETALLIC MATERIALS
    Type: AIAA PAPER 85-0420
    Format: text
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  • 4
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    Coaxial carbon plasma gun deposition of amorphous carbon films (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A unique plasma gun employing coaxial carbon electrodes was used in an attempt to deposit thin films of amorphous diamond-like carbon. A number of different structural, compositional, and electrical characterization techniques were used to characterize these films. These included scanning electron microscopy, scanning transmission electron microscopy, X ray diffraction and absorption, spectrographic analysis, energy dispersive spectroscopy, and selected area electron diffraction. Optical absorption and electrical resistivity measurements were also performed. The films were determined to be primarily amorphous, with poor adhesion to fused silica substrates. Many inclusions of particulates were found to be present as well. Analysis of these particulates revealed the presence of trace impurities, such as Fe and Cu, which were also found in the graphite electrode material. The electrodes were the source of these impurities. No evidence of diamond-like crystallite structure was found in any of the film samples. Details of the apparatus, experimental procedure, and film characteristics are presented.
    Keywords: SOLID-STATE PHYSICS
    Type: NASA-TM-83600 , E-2012 , NAS 1.15:83600
    Format: application/pdf
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  • 5
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    Ion beam sputter deposited diamond like films (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A single argon ion beam source was used to sputter deposit carbon films on fused silica, copper, and tantalum substrates under conditions of sputter deposition alone and sputter deposition combined with simultaneous argon ion bombardment. Simultaneously deposited and ion bombarded carbon films were prepared under conditions of carbon atom removal to arrival ratios of 0, 0.036, and 0.71. Deposition and etch rates were measured for films on fused silica substrates. Resulting characteristics of the deposited films are: electrical resistivity of densities of 2.1 gm/cu cm for sputter deposited films and 2.2 gm/cu cm for simultaneously sputter deposited and Ar ion bombarded films. For films approximately 1700 A thick deposited by either process and at 5550 A wavelength light the reflectance was 0.2, the absorptance was 0.7, the absorption coefficient was 67,000 cm to the -1 and the transmittance was 0.1.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-TM-82873 , E-1249 , NAS 1.15:82873
    Format: application/pdf
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  • 6
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    Ion beam sputter-deposited thin film coatings for protection of spacecraft polymers in low Earth orbit (1985)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Ion beam sputter-deposited thin films of Al2O3, SiO2, and a codeposited mixture of predominantly SiO2 with small amounts of a fluoropolymer were evaluated both in laboratory plasma ashing tests and in space on board shuttle flight STS-8 for effectiveness in preventing oxidation of polyimide Kapton. Measurements of mass loss and optical performance of coated and uncoated polyimide samples exposed to the low Earth orbital environment are presented. Optical techniques were used to measure loss rates of protective films exposed to atomic oxygen. Results of the analysis of the space flight exposed samples indicate that thin film metal oxide coatings are very effective in protecting the polyimide. Metal oxide coatings with a small amount of fluoropolymer codeposited have the additional benefit of great flexibility.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-TM-87051 , E-2454 , NAS 1.15:87051 , Aerospace Sci. Meeting; Jan 14, 1985 - Jan 17, 1985; Reno, NV; United States
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  • 7
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    Sputtered coatings for protection of spacecraft polymers (1983)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Kapton polyimide oxidizes at significant rates (4.3x10(-24) gram/incident oxygen atom) when exposed in low Earth orbit to the ram atomic oxygen flux. Ion beam sputter deposited thin films of Al2O3 and SiO2 as well as a codeposited mixture of predominantly SiO2 with a small amount of polytetrafluoroethylene were evaluated and found to be effective in protecting Kapton from oxidation in both laboratory plasma ashing tests as well as in space on board shuttle flight STS-8. A protective film of or = 96 percent SiO2 and or = 4 percent polytetrafluoroethylene was found to be very flexible compared to the pure metal oxide coatings and resulted in mass loss rates that were 0.2 percent of that of the unprotected Kapton. The optical properties of Kapton for wavelengths investigated between 0.33 and 2.2 microns were not significantly altered by the presence of the coatings or changed by exposure of the coated Kapton to the low Earth orbital ram environment.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-TM-83706 , E-2092 , NAS 1.15:83706 , Intern. Conf. on Met. Coatings; Apr 09, 1984 - Apr 13, 1984; San Diego, CA; United States
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  • 8
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    Zr-Containing 4,4'-ODA/PMDA Polyimide Composites (2001)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: The objective of this research is to improve the atomic oxygen resistance of Kapton(TM), a polyimide (PI) made from pyromellitic acid dianhydride (PMDA) and 4,4'-oxydianiline (ODA), while retaining or enhancing the desirable properties of the pure polymer. Toward this end, zirconium-containing complexes and polymers were used to make composites and blends. Tetra(acetylacetonato)zirconium(IV), Zr(acac)4, which is commercially available, was identified as the best zirconium-containing complex for enhancing the atomic oxygen resistance of polyimide composites of the 10 complexes screened. Films prepared from the commercially available polyamic acid (PAA) of PMDA-ODA (DuPont) have good uniformity, flexibility, and tensile strength. A 24-layer 10% (mol) Zr(acac)4/PI composite film showed significant improvement (ca. 20 fold) of atomic oxygen resistance over the pure polyimide. However, 10% (mol) Zr(acac)4 represents an upper concentration limit, above which films undergo cracking upon thermal imidization. In order to increase the Zr complex concentration in PMDA-ODA PI films, while retaining good film properties, [Zr(adsp)2-PMDA]n coordination polymer [bis(4-amino-N,N'-disalicylidene- 1,2-phenylenediamino)zirconium(IV)-pyromellitic dianhydride] and [Zr(adsp)2-PMDA-ODA-PMDA]n terpolymer were synthesized and blended with commercial PAA, respectively. Several techniques were used to characterize the films made from the polymer containing Zr(acac)4. Plasma studies of films having 2% (mol) incremental concentrations of Zr in the Kapton up to 10% (mol) show that the overall rate of erosion is reduced about 75 percent.
    Keywords: Nonmetallic Materials
    Type: NASA/TM-2001-211099 , NAS 1.15:211099 , E-12944
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  • 9
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    Atomic Oxygen Treatment Technique for Removal of Smoke Damage from Paintings (1997)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Soot deposits that can accumulate on surfaces of a painting during a fire can be difficult to clean from some types of paintings without damaging the underlying paint layers. A non-contact technique has been developed which can remove the soot by allowing a gas containing atomic oxygen to flow over the surface and chemically react with the soot to form carbon monoxide and carbon dioxide. The reaction is limited to the surface, so the underlying paint is not touched. The process can be controlled so that the cleaning can be stopped once the paint surface is reached. This paper describes the smoke exposure and cleaning of untreated canvas, acrylic gesso, and sections of an oil painting using this technique. The samples were characterized by optical microscopy and reflectance spectroscopy.
    Keywords: Nonmetallic Materials
    Type: NASA-TM-107403 , NAS 1.15:107403 , E-10610 , Dec 02, 1996 - Dec 06, 1996; Boston, MA; United States
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  • 10
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    Masking Technique for Ion-Beam Sputter Etching (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Improved process for fabrication of integrated circuits developed. Technique utilizes simultaneous ion-beam sputter etching and carbon sputter deposition in conjunction with carbon sputter mask or organic mask decomposed to produce carbon-rich sputter-mask surface. Sputter etching process replenishes sputter mask with carbon to prevent premature mask loss.
    Keywords: FABRICATION TECHNOLOGY
    Type: LEW-13899 , NASA Tech Briefs (ISSN 0145-319X); 10; 3; P. 140
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