Vpliv koncentracije karboksilne in perfluorirane karboksilne kisline na trenje elasto-hidrodinamičnih kontaktov

Podobnik Vrhovnik, Miha (author), Polajnar, Marko (mentor), Kalin, Mitjan (comentor)

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.

• Language: Slovenian
• Keywords: elasto-hidrodinamično mazanje, aditivi, organski modifikatorji trenja, perfluorirane spojine, adsorpcija, trenje, površinska energija
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Place of publishing: Ljubljana
• Publisher: [M. Podobnik Vrhovnik]
• Year: 2023
• Number of pages: XXII, 73 str.
• PID: 20.500.12556/RUL-148749
• UDC: 621.89:532.614(043.2)
• COBISS.SI-ID: 166156291
• Publication date in RUL: 31.08.2023

PODOBNIK VRHOVNIK, Miha, 2023, Vpliv koncentracije karboksilne in perfluorirane karboksilne kisline na trenje elasto-hidrodinamičnih kontaktov [online]. Master’s thesis. Ljubljana : M. Podobnik Vrhovnik. [Accessed 26 April 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=148749

Secondary language

• Language: English
• Title: Influence of concentration of carboxylic and perfluorocarboxylic acid on friction in elastohydrodynamic contacts

Abstract

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.

• Keywords: elastohydrodynamic lubrication, additives, organic friction modifiers, perfluorinated substances, adsorption, friction, surface energy