The object of this research is to investigate the tribological properties of glycerol lubricant\nwith aluminum nanoparticles as an additive and sodium dodecyl sulfate (SDS) as the dispersive\nmedium for iron to iron friction using a thrust collar tribotester. Meanwhile, the effects of different\nconcentrations of aluminum nanoparticles, SDS, and deionized water in glycerol on tribology\nproperties of iron to iron friction were studied. The experimental parameters were set up according\nto the Taguchi technique, their influence on the coefficient of friction (COF) and wear rate were\nexamined by response surface methodology (RSM) and analysis of variance (ANOVA) methods.\nThe analysis results were employed to optimize the parameters to obtain the best lubricant effects.\nThe optimal combination of the parameters for both minimum COF and wear rate was found to be\n0.6667 weight percent (wt %) of aluminum nanoparticles, 2 wt % of SDS, and 10 wt % of deionized\nwater content of glycerol. The wear surface topography and the average roughness of the surface\nwere also examined using a scanning electron microscope (SEM) and a Mitutoyo Surftest SJ-400\ninstrument. The results show that aluminum nanoparticles used as an additive in lubricant reduce the\nsurface roughness of a collar remarkably. The energy dispersive spectrometer (EDS) was utilized to\nconfirm the deposition of aluminum nanoparticles on the collar surface leading to decreased friction\nand wear.
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