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  • 1
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    The in-vacuo torque performance of dry-lubricated ball bearings at cryogenic temperatures (1989)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The performance of dry-lubricated, angular contact ball bearings in vacuum at a temperature of 20 degrees K has been investigated, and is compared with the in-vacuo performance at room temperatures. Bearings were lubricated using dry-lubricant techniques which have been previously established for space applications involving operations at or near room temperature. Comparative tests were undertaken using three lubricants: molybdenum disulphide, lead, and PTFE. Results obtained using the three lubricants are presented.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA, Marshall Space Flight Center, The 23rd Aerospace Mechanisms Symposium; p 319-333
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Development of long-life, low-noise linear bearings for atmospheric interferometry (1994)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: This paper describes the development of dry-lubricated linear bearings for use on the Michelson interferometer for passive atmospheric sounding (MIPAS). Two candidate bearing systems were developed and tested. In the first, use was made of linear roller (needle) bearings equipped with a pulley-and-cable arrangement to prevent cage drift and to minimize roller slip. The second design was of a roller-guided bearing system in which guidance was provided by all bearings rolling along guide rods. The paper focuses on the development of these linear bearings systems and describes the approach taken in terms of bearing design, lubrication methods, screening programs, and thermal-vacuum testing. Development difficulties are highlighted and the solutions ultimately adopted are described.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA. Lewis Research Center, The 28th Aerospace Mechanisms Symposium; p 245-264; NASA-CP-3260
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Towards an optimised sputtered MoS2 lubricant film (1986)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: It is shown that the tribological quality of MoS2 lubricant films formed by magnetron sputtering is determined by the choice of sputtering conditions. By selecting the appropriate conditions, films of extremely high lubricity and endurance (in vacuum), which are well suited to many space applications, are obtained. Such MoS2 films, when applied to precision ball hearings, give rise to the lowest torques (for the given test conditions) yet seen in our laboratory. While a remarkably good performance is obtained in vacuum, tests in air show a marked deterioration in lubricating qualities. It is demonstrated that this is attributable to the adsorption of water vapor on MoS2 surfaces and that the degree of deterioration is related to the partial pressure of water vapor present. Analysis of results indicates that the factors relevant to obtaining optimum films are deposition rate and film composition.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA. Lewis Research Center The 20th Aerospace Mechanics Symposium; p 103-119
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Power characteristics of fuels for aircraft engines (1920)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Report presents the summation of results obtained in the testing of fuels of various compositions and characteristics in the altitude laboratory. The data upon which this report is based has had an important influence upon the writing of specifications for the various grades of aviation fuels.
    Type: NACA-TR-47
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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