INVESTIGATION OF THE INFLUENCE OF ANTIWEAR ADDITIVES DISPERSED IN HYDRAULIC OIL ON FRICTION AND WEAR | ||||
| Journal of the Egyptian Society of Tribology | ||||
| Volume 19, Issue 3, July 2022, Page 68-79 PDF (1.07 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jest.2022.249535 | ||||
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| Abstract | ||||
| The influence of antiwear additive dispersed in hydraulic oils containing zinc dialkyl dithiophosphates is tested. The tested additives are dispersed in the hydraulic oil at different concentrations. Tests were carried out to test the friction and wear of bearing steel lubricated by hydraulic oil dispersed by the tested additives using reciprocating wear tester. It was observed that friction coefficient decreased as the additive content increased. The lowest values were observed at 0.6 wt. %. Further increase in additive content slightly increased friction. Wear decreased with increasing additive content. The lowest wear values were observed at 1.0 wt. %. The reduction in friction and wear may be attributed to the mechanism of action of the protective film formed from the decomposition products of the additive. The film worked as solid lubricants and decreased friction and wear. The anti-wear behavior of the tested additive can be explained on the basis of the formation of organometallic compounds, where their function depends on forming iron sulfide layer on the sliding steel surfaces of relatively high hardness that resisted excessive wear. Inspecting the topography of the worn surfaces of the test specimens and steel counterface by optical microscope confirmed the enhancing influence of the tested additive in reducing wear. | ||||
| Keywords | ||||
| Anti-wear additives; hydraulic fluids; wear; friction; reciprocating motion | ||||
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