20.500.12556/RUL-148749 Vpliv koncentracije karboksilne in perfluorirane karboksilne kisline na trenje elasto-hidrodinamičnih kontaktov Influence of concentration of carboxylic and perfluorocarboxylic acid on friction in elastohydrodynamic contacts Elasto-hidrodinamično (EHD) mazanje je režim mazanja, pri katerem sta površini v kontaktu popolnoma ločeni z mazalnim filmom. Trenje v EHD kontaktih, ki je posledica strižnih napetosti znotraj mazalnega filma, ima ključen vpliv na zmogljivost in učinkovitost tako mazanih mehanskih sistemov. Izvedene so bile eksperimentalne preiskave mešanic različnih koncentracij tetradekanojske in perfluorotetradekanojske kisline kot aditivov v mazivih in izmerjene njihove torne lastnosti v EHD kontaktih. Rezultati triboloških preskusov in nadaljnje površinske analize so pokazale, da perfluorirane karboksilne kisline, v primerjavi s karboksilnimi kislinami, izkazujejo bistveno boljše lastnosti zmanjševanja trenja že pri nizkih koncentracijah in tako predstavljajo učinkovit nov pristop pri zmanjševanju trenja v EHD kontaktih. Elastohydrodynamic (EHD) lubrication is a lubrication regime characterized by the complete separation of contacting surfaces by a lubricant film. Friction in EHD contacts, caused by shear stresses within the lubricant film, is a critical factor affecting the performance and efficiency of thus lubricated mechanical systems. Experimental investigations were conducted using different concentrations of tetradecanoic and perfluorotetradecanoic acids as lubricant additives and their resulting frictional characteristics in EHD contacts were measured. Results of the tribological tests and further surface analyses have shown that perfluorocarboxylic acids demonstrate significantly superior friction reduction properties, even at low concentrations, compared to carboxylic acids, and have shown to be an effective novel strategy in reducing friction in EHD contacts. elasto-hidrodinamično mazanje aditivi organski modifikatorji trenja perfluorirane spojine adsorpcija trenje površinska energija elastohydrodynamic lubrication additives organic friction modifiers perfluorinated substances adsorption friction surface energy true false false [M. Podobnik Vrhovnik] Slovenski jezik Angleški jezik Magistrsko delo/naloga 2023-08-31 08:30:47 2023-08-31 08:30:49 2023-09-28 10:38:48 0000-00-00 00:00:00 2023 0 Ljubljana 0 XXII, 73 str. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 621.89:532.614(043.2) 255385 166156291 29626.pdf 29626.pdf 1 2E9FF6BBCF0937C94520379F0ABBC950 62417f9a5ed22054d77feabedc3ba4d6fb1a9c57dc6cc3fae0692d10b4c33670 ed86d62f-47c7-11ee-af86-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=173096 Fakulteta za strojništvo 0 0 0