The Effect of Film Thickness on Friction Coefficients for Solid Lubricants; CaF2, MoS2 and Graphite |
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| Authors: | G D Whitehouse D Nandan C A Whitehurst |
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| Affiliation: | 1. Louisiana State University , Baton Rouge, La.;2. Technical Associates , New Orleans, La. |
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| Abstract: | An experimental investigation has been conducted to determine the effect of film thickness on the friction coefficient of solid powdered lubricants, applied as thin films on the mild steel specimens. Curves representing the coefficient of friction for various film thicknesses, as well as the tabulated data are given. The results are discussed and compared to those theoretically conceivable using the relationship of Bowden and Tabor and that of Rabinowicz. Solid films of graphite, molybdenum disulphide and calcium fluoride with a thickness range of 0.0002 to 0.0008 in. were used. It has been concluded that, for the solid lubricants tested, the coefficient of friction is dependent upon the film thickness. The Theory of Adhesion by Bowden and Tabor and the mathematical relationship by Rabinowicz do not adequately explain the variation in the coefficient of friction as the film thickness varies. |
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