Friction and wear reduction properties of GNP nano-particles as nano-additive for Al-Si

Engine component durability in terms of friction and wear urge for the growth of new engineering materials and nano-lubricants for reducing friction and wear losses. Tribological test are carried out on eutectic Al-Si with (0 10 wt. %) n-Al2O3 composite using reciprocating tribometer under high applied load (100 N - 300 N) with stroke 2 mm, 30 Hz frequency and 120-meter sliding distance. Base PAO-4 lubricating oil, SAE20W50 commercial lubricating oil, PAO-4 + 0.5 wt % GNP, PAO-4 + 0.5 wt. % GNP + 0.5 wt % oleic acid (OA) are used as the lubricating oil for the present study. The tribo-test results suggest the COF, wear volume and wear rate significantly reduced for PAO-4 + 0.5 wt % GNP + 0.5 wt.% OA in comparison to other lubricants. The friction and wear volume reduction percentage for PAO-4 + 0.5 wt. % GNP + 0.5 wt % OA lubricating oil is in the range 56.82 % and 21.56 % respectively compared to base PAO-4 base and SAE20W50 commercial lubricating oil. The anti-friction and anti-wear properties of the GNP based lubricant is because of roll-ball bearing, mending mechanism as well as tribo-film formation on the sliding interface.