Solid and liquid thin films have been analyzed by infrared emission Fourier microspectrophotometry. The apparatus used in a commercial absorption instrument modified to an emission instrument, comprising a rotating polarizing device, a miniature blackbody temperature reference adjustable in temperature and radiant flux and a microscope lens with a high numerical aperture in the entrance system for increased sensitivity and resolution. In addition, new measurement methods for the application of this hardware have been developed. Studies of lubricant behavior in a simulated ball bearing showed the alignment of the fluid molecules in the Hertzian area. Polyphenyl ether contaminated with 1 % 1,1,2-trichloroethane required far lower shear rates for the same degree of alignment than without contaminant. The experiment was run with 440 C stainless steel balls and 440 C balls coated with TiN, a chemically inert material. In both cases, the alignment was strongly influenced by the presence of the contaminant. The results showed the dependence of alignment of fluid molecules on flow and not on adsorption at metallic surfaces phase separation between lubricant and additive under high pressure which results in two-phase flow and reduction in traction of torque-transmitting (traction) fluids. Measurements of phase separation by differential thermal analysis and in a high pressure cell, and traction measurements confirmed the spectral results.
Lubricants in bearings and absorbed materials on aircraft fuel lines by infrared emission Fourier microspectrophotometry
Anwendung der Fourier Mikrospektrometrie fuer die Analyse von Schmierstoffen und absorbierten Stoffen in Flugzeug-Treibstoffleitungen
1982
236 Seiten
Theses
English
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