Accession Number : AD0777590

Title :   Aircraft Propulsion Lubricating Film Additives: Boundary Lubricant Surface Films. Volume I.

Descriptive Note : Technical rept. 3 Feb-30 Nov 73,


Personal Author(s) : Allen,C. M. ; Drauglis,E. ; Glaeser,W. A. ; Alexander,C. A. ; Jakobsen,R. J.

Report Date : JAN 1974

Pagination or Media Count : 82

Abstract : The hypothesis under study is that boundary films possess properties significantly different from those of bulk fluids because of the presence of molecular interacting forces which tend to produce ordered, molecularly oriented, multilayered, relatively thick (5000 A) surface films. Experimental research on the detection of ordering is being carried out by means of frustrated-multiple-internal-reflection, infrared spectroscopy while the thermal properties, including heats of sorption, are being conducted on a very sensitive mass-spectrometric molecular-effusion instrument. The friction, shear stress, and damping behavior of the surface films are being studied with a stick-slip friction apparatus. The whole is being supported by theoretical analysis with a view to developing a mathematical model for application to the development of practical boundary lubricants for aircraft propulsion systems. The subject report is the first of three, and it is devoted to investigations of straight-chain hydrocarbon solvent/solute systems using the techniques just described. (Modified author abstract)

Descriptors :   *Lubricants, Surface properties, Films, Nuclear magnetic resonance, Infrared spectroscopy, Hydrocarbons, Thermal properties, Friction, Shear stresses, Molecular structure, Damping, Fatty acids, Polystyrene, Crystals, Amorphous materials, Mathematical models

Subject Categories : Lubricants and Hydraulic Fluids
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE