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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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    Properties and potential applications of brominated P-100 carbon fibers (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A review of the properties and potential applications of bromine-intercalated pitch-based carbon fibers is presented. The dynamics of the intercalation reaction are summarized, and characteristics, such as resistivity, density, and stability, are discussed. In addition, the mechanical and electrical properties of bromine-intercalated fiber-epoxy conposites will be addressed. With conductivities comparable to stainless steel, these brominated carbon fibers may be used in a number of composite applications, such as electromagnetic interference shielding containers, large conductive space structures, lightning strike-tolerant aircraft surfaces, and aircraft deicing applications.
    Keywords: NONMETALLIC MATERIALS
    Type: SAMPE Quarterly (ISSN 0036-0821); 18; 9-14
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Diamondlike carbon films on semiconductors for insulated-gate technology (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: MIS structures are fabricated on p-type InP, GaAs, and Si substrated by direct ionization of 25-percent CH4 in Ar and ion-beam deposition of 70-nm-thick diamondlike films, followed by application of Al gate electrodes and ohmic contacts. The films are found to have bandgap 0.9-1.1 eV, resistivity 8.1 Mohm cm, breakdown field strength 1 MV/cm, and density 1.8 g/cu cm, to be thermally stable up to 400 C, and to undergo rapid decomposition above 450 C. The electrical properties of the MIS structures are significantly improved by sputter cleaning the substrates with a 1-keV 2-mA/sq cm Ar beam for 2 min at 300 microtorr prior to C-film deposition. The resulting structures have fixed insulator charge number densities 4 x 10 to the 12th/sq cm (InP), 7.5 x 10 to the 12th/sq cm (GaAs), and 9 x 10 to the 11th/sq cm (Si) and interface state densities (5, 200, and 0.5) x 10 to the 12th/ sq cm eV, respectively. It is suggested that the low optical bandgap and resistivity of the C films and the high insulator-charge and interface-state densities make them unstable as gate dielectrics for microelectronics.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: Journal of Vacuum Science and Technology A (ISSN 0734-2101); 4; 1013-101
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Radially slotted grids for a Kaufman ion thruster. (1967)
    In:  Other Sources
    Details
    Publication Date: 2011-08-11
    Description: Kaufman mercury-ion thrustor grid design, discussing radial slot configuration
    Keywords: PROPULSION SYSTEMS
    Type: JOURNAL OF SPACECRAFT AND ROCKETS
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Ion-beam-sputter modification of the surface morphology of biological implants (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The surface chemistry and texture of materials used for biological implants may significantly influence their performance and biocompatibility. Recent interest in the microscopic control of implant surface texture has led to the evaluation of ion-beam sputtering as a potentially useful surface roughening technique. Ion sources, similar to electron-bombardment ion thrusters designed for propulsive applications, are used to roughen the surfaces of various biocompatible alloys or polymer materials. These materials are typically used for dental implants, orthopedic prostheses, vascular prostheses, and artificial heart components. Masking techniques and resulting surface textures are described along with progress concerning evaluation of the biological response to the ion-beam-sputtered surfaces.
    Keywords: NONMETALLIC MATERIALS
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Dual ion beam processed diamondlike films for industrial applications (1991)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Single and dual beam ion source systems are used to generate amorphous diamondlike carbon (DLC) films, which were evaluated for a variety of applications including protective coatings on transmitting materials, power electronics as insulated gates and corrosion resistant barriers. A list of the desirable properties of DLC films along with potential applications are presented.
    Keywords: NONMETALLIC MATERIALS
    Type: National Aeronautics and Space Administration, Technology 2000, Volume 1; p 173-183
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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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
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Advanced concepts (1980)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The relative strengths of those interactions which enable propulsive forces are listed as well as the specific impulse of various propellants. Graphics show the linear synchronous motor of the mass driver, the principle of the direct current electromagnetic launcher, and the characteristics of the rail gun.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: Large Space Systems(Low-Thrust Propulsion Technol.; p 337-342
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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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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    NASA TECHNICAL REPORTS
  • 10
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    Oxidation protection coatings for polymers (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A polymeric substrate is coated with a metal oxide film to provide oxidation protection in low Earth orbital environments. The film contains about 4 volume percent polymer to provide flexibility. A coil of polymer material moves through an ion beam as it is fed between reels. The ion beam first cleans the polymer material surface and then sputters the film material from a target onto this surface.
    Keywords: NONMETALLIC MATERIALS
    Format: application/pdf
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