Study on Friction-Reducing Mechanism by Combining a Multiple-PointAdsorbed Films of an Organic Polymer and Surface Roughness Texture

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The present study is aimed at construction of friction-reducing mechanism by combining a multiple-point adsorbed film of an organic polymer and the micro-EHL effect caused by surface roughness. Polymethacrylate was adopted as a multiple-point adsorptive organic polymer in this study. Two types of friction measurements were conducted; the first was a cylinder-on-disk tribometer under a varying sliding speed at constant load and temperature, and the other was a 3 ball-on-disk tribometer under an elevated temperature at constant load and speed. Experimental results indicated that the polymers showed friction-reducing effect due to multiple-point adsorption with a number of the functional groups, and thus the most appropriate structure of the polymer was suggested to exert the friction-reducing effect. In addition, anisotropic surface roughness was introduced to the friction measurement using the cylinder-on-disk tribometer for clarifying the friction-reducing effect of the multiple-point adsorbed film from the polymer at transverse direction. The results implied that the friction-reducing effect could be explained not only by the micro-EHL effect caused at transverse direction of the anisotropic roughness but also by some other load-bearing effect, which depends on the formation state of the adsorbed film.