20.500.12556/RUL-183418 Optimizing lubrication in step slider bearings the role of oiliness additives on film formation and friction reduction This study examines how the molecular structures of oiliness additives affect the lubrication performance of a step slider bearing. Here an optical step-slider-on-disc tribometer was used to measure interferometric film thickness together with friction force under the present test conditions. Seven representative molecules (undecanedioic acid, undecanoic acid, palmitic acid, stearic acid, oleic acid, oleylamine and oleyl alcohol) were each blended into PAO8 at 0.15 wt% to separately probe headgroup polarity, alkyl-chain length, saturation and the number of polar heads. Compared with neat PAO8, every formulation produced a thicker film (up to 106% increase) and a lower coefficient of friction (up to 65.9% reduction), with stearic acid delivering the best overall improvement. To interpret the trends, wettability of the step-slider surface after lubricant treatment was assessed by deionized-water contact-angle measurements. The observed inlet–outlet wetting asymmetry is consistent with a possible asymmetry in interfacial slip, which may contribute to the experimentally observed combination of film-thickness increase and friction reduction. oiliness additives surface adsorption films step slider bearing optical interferometry film thickness interfacial slip eksperiment z aspernostjo na terenu večaspernostni stiki realna kontaktna površina utrjevanje deformacija jeklo hrapavost true false true Angleški jezik Slovenski jezik Članek v reviji 2026-06-12 13:36:54 2026-06-12 13:37:02 2026-06-13 04:29:48 0000-00-00 00:00:00 2026 0 0 Str. 1-10 Vol. 222, art. 112134 2026 0000-00-00 PostprintKoncna Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 539.92:539.37:669.14 0301-679X 10.1016/j.triboint.2026.112134 278637315 Zhaogang_..._Optimizing_lubrication_in_step.pdf Zhaogang_..._Optimizing_lubrication_in_step.pdf 1 CFBB273BAD9D15B94FAF5B766AF8A1FC 9a6fe4aee67620816df2bee2010534ae3d2065d04863e354da58def6bbdb9cf7 be0c64e6-6657-11f1-9b0d-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=235476 https://www.sciencedirect.com/science/article/pii/S0301679X26004779 1 007d7896-6653-11f1-9b0d-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=235474 Fakulteta za strojništvo 0 0 0