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  • 11
    facet.materialart.
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    Dynamics of solid lubrication as observed by optical microscopy (1976)
    In:  CASI
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: A bench metallograph was converted into a micro contact imager by the addition of a tribometer employing a steel ball in sliding contact with a glass disk. The sliding contact was viewed in real time by means of projection microscope optics. The dynamics of abrasive particles and of solid lubricant particles within the contact were observed in detail. The contact was characterized by a constantly changing pattern of elastic strain with the passage of surface discontinuities and solid particles. Abrasive particles fragmented upon entering the contact, embedded in one surface and scratched the other; in contrast, the solid lubricant particles flowed plastically into thin films. The rheological behavior of the lubricating solids gave every appearance of a paste-like consistency within the Hertzian contact.
    Schlagwort(e): MECHANICAL ENGINEERING
    Materialart: NASA-TM-X-71880 , E-8653 , Joint Lubrication Conf.; Oct 05, 1976 - Oct 07, 1976; Boston, MA; United States
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    NASA TECHNICAL REPORTS
  • 12
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    Unbekannt
    Graphite-fiber-reinforced polyimide liners of various compositions in plain spherical bearings (1978)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: Composites made of graphite-fiber-reinforced polyimide (GFRPI) with a fiber-resin ratio (by weight) of about 1 were evaluated as molded outer-race liners in plain spherical bearings. Several compositions were examined: two types of polyimide (addition and condensation polymers), two types of graphite fiber (high and low modulus) and four powder additives (CdO, CdI2, (CF1.1)n, and MoS2). Friction and wear were measured during oscillation at 25, 200, and 315 C. It is shown that all compositions provided good lubrication in dry air, that neither type of polyimide or graphite fiber nor the additives gave a clear advantage, and that wear rates were always higher during run-in, before conditions stabilized. It is concluded that GFRPI composites are self-lubricating under all but the most extreme moisture-free conditions at 25 C. The additives are helpful only with very high loads or extremely dry environments.
    Schlagwort(e): MECHANICAL ENGINEERING
    Materialart: International Conference on Solid Lubrication; Aug 15, 1978 - Aug 18, 1978; Denver, CO
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    NASA TECHNICAL REPORTS
  • 13
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    Performance of graphite fiber-reinforced polyimide composites in self-aligning plain bearings to 315 C (1975)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-13
    Schlagwort(e): MECHANICAL ENGINEERING
    Materialart: ASLE PREPRINT 75AM-2D-4 , American Society of Lubrication Engineers, Annual Meeting; May 05, 1975 - May 08, 1975; Atlanta, GA
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    NASA TECHNICAL REPORTS
  • 14
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    Unbekannt
    Wide-temperature-spectrum self-lubricating coatings prepared by plasma spraying (1979)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: Self-lubricating, multicomponent coatings, which lubricate over a wide range of operating conditions, are described. The coatings have been successfully applied by plasma-spraying mixed powders onto superalloy substrates. They have been evaluated in friction and wear experiments, and in sliding contact bearing tests. These coatings are wear resistant by virtue of their self-lubricating characteristics rather than because of extreme hardness; a further benefit is low friction. Experiments with simple pin on disk sliding specimens and oscillating plain cylindrical bearing tests were performed to evaluate the tribological properties of the coatings. It was shown that coatings of nichrome, glass and calcium fluoride are self-lubricating from about 500 to 900 C, but give high friction at the lower temperatures. The addition of silver to the coating composition improved the low temperature bearing properties and resulted in coatings which are self-lubricating from cryogenic temperatures to at least 870 C; they are therefore 'wide temperature spectrum,' self-lubricating compositions.
    Schlagwort(e): MECHANICAL ENGINEERING
    Materialart: American Vacuum Society and American Society for Metals, International Conference on Metallurgical Coatings; Apr 23, 1979 - Apr 27, 1979; San Diego, CA
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    NASA TECHNICAL REPORTS
  • 15
    facet.materialart.
    Unbekannt
    Some loads limits and self-lubricating properties of plain spherical bearings with molded graphite fiber-reinforced polyimide liners to 320 C (1978)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-13
    Schlagwort(e): MECHANICAL ENGINEERING
    Materialart: ASLE PREPRINT 78-LC-5C-2 , American Society of Lubrication Engineers and American Society of Mechanical Engineers, Joint Lubrication Conference; Oct 24, 1978 - Oct 26, 1978; Minneapolis, MN
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    NASA TECHNICAL REPORTS
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