Abstract
The friction coefficient, wear rate, and wear coefficient of the aluminum metal surface were measured at room temperature (≈300 K) with a pin-on-disk machine at a fixed load of 196.2 N. Two different testing configurations were adopted: (1) aluminum pin vs. Helix oil-on-steel disk (AHS) and (2) aluminum pin vs. 10% Polytron plus 90% helix oil-on-steel disk (APS). In the AHS configuration, the wear of the aluminum surface was found to be approximately 70 μm; however, in the APS configuration the wear dropped to 20 μm, revealing a marked decrement of one-third of the wear of aluminum. The volume wear rate of the metal in the unaided Helix oil was estimated to be 1.28×10–3 mm3/min. The additive minimized the volume wear rate of the aluminum metal by orders of magnitude to 6.08×10–5 mm3/min. Similarly, the wear coefficient of the aluminum pin, calculated in the AHS configuration, rendered a value of 1.27×10–10 m2/N. In the APS configuration, the same parameter was 4.22×10–11 m2/N, that is to say, an order of magnitude lower than the preceding value. The observed coefficient of friction for aluminum is 0.012 in Helix oil and falls to a remarkably lower value of 0.004 through the Polytron additive. The experimental findings demonstrate that Polytron additive substantially lessens the wear of the aluminum surface; in effect, the wear coefficient and the wear rate decline linearly. This singularity may be linked to the ability of Polytron to impregnate the crystal structure of the metal due to its ionic character and the consequent adherence to the metallic surface as a hard surface layer.
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Syed Mohammad Hasan AHMER. He received his master degree in physics in 1992 from the University of Karachi, Pakistan. Currently he is a Ph.D. student in the University Malaga International (UMA), Spain. He is pursuing his Ph.D. studies at the Department of Mechanical Engineering. He is a lecturer of physics at the Royal Commission of Yanbu Colleges and Institutes (RCYCI), Saudi Arabia. His research interests include friction, wear, and lubrication.
Lal Said JAN. He received his M.S. degree in physics in 1990 from the University of Peshawar, Pakistan. He received his Ph.D. degree in 2006 from the Department of Applied Physics, National University of Malaysia (UKM), Malaysia. During his Ph.D. studies, he did research on nano-structured polymers and ceramics. He is an assistant professor of physics at the Royal Commission of Yanbu Colleges and Institutes (RCYCI), Saudi Arabia. His current research interest is tribology of nano-structured materials.
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Ahmer, S.M.H., Jan, L.S., Siddig, M.A. et al. Experimental results of the tribology of aluminum measured with a pin-on-disk tribometer: Testing configuration and additive effects. Friction 4, 124–134 (2016). https://doi.org/10.1007/s40544-016-0109-7
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DOI: https://doi.org/10.1007/s40544-016-0109-7