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  • 1
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    Film thickness measurements on five fluid formulations by the mercury squeeze film capacitance technique (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The thinning characteristics of five fluids were studied by measuring film thickness as a function of time. The mercury squeeze film capacitance technique was used. All tests were performed at room temperature. The synthetic hydrocarbon plus a nematic liquid crystal, N-(p-methoxybenzylidene)-p-butylaniline, thinned according to a Newtonian model and retained its bulk viscosity. The synthetic hydrocarbon plus a phosphonate antiwear additive and the synthetic hydrocarbon plus n-hexadecanol produced residual thick films. The synthetic hydrocarbon base fluids and the synthetic hydrocarbon plus a paraffinic resin displayed viscosity increases during thinning, but no residual films were formed.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-TN-D-8171 , E-8554
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Fundamental considerations for future solid lubricants (1969)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Properties important to the performance of solid lubricants are discussed. Those properties include shear characteristics, coherence between particles, resistance to cold flow, adherence to the substrate, applicable chemical thermodynamics and kinetics of materials and environments, polymorphism, and rheology. The following generalizations are made: (1) chemical thermodynamics and kinetics are powerful tools for use in determining the useful environments and methods of application for solid film lubricants; (2) the primary requirement for a solid lubricant is low shear strength; (3) the rheology of solid film constituents and formulations is likely to be of vital importance to performance and life; and (4) adherence and mobility of surface films is another primary requirement for long lived solid lubricants.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-TM-X-52659 , E-5241 , Conf. on Solid Lubricants; Sep 09, 1969 - Sep 11, 1969; Kansas City, MO; United States
    Format: application/pdf
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  • 3
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    Pressure-viscosity measurements for several lubricants to 550 meganewtons per square meter /80,000 PSI/ and 149 C /300 F/ (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The viscosities of a number of liquid lubricants and lubricant formulations, determined as function of pressure, temperature, and shear stress by means of a high-pressure capillary viscometer, are reviewed. Where possible, these results are compared with those obtained by other techniques (optical elastohydrodynamics, oscillating crystal, and low shear capillary viscometry).
    Keywords: NONMETALLIC MATERIALS
    Type: ASLE PREPRINT 74LC-4C-1 , American Society of Lubrication Engineers and American Society of Mechanical Engineers, Joint Lubrication Conference; Oct 08, 1974 - Oct 10, 1974; Montreal; Canada
    Format: text
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    NASA TECHNICAL REPORTS
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