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  • The Effect of different additives on interfacial properties and ehd friction of steel/steel contact at 25 °C and 100 °C [Elektronski vir]
    Polajnar, Marko ...
    Tailoring the friction in EHD contacts is of great importance for all non-conformal contacts such as bearings, cam-followers, gears, etc. In addition to conventional EHD parameters, recent studies ... suggest significant EHD friction reduction, via two possible mechanisms, namely either thermal-insulating influence of insulating surfaces layers or solid-liquid interface slip due to weak boundary interactions. So far, analyses have shown that both mechanisms may have importance, but more information is required. In this study we investigate how different additives (glycerol Monooleate, Ionic liquid and Organic film former) that adsorb to the surface and so change its surface energy affect the EHD friction in steel/steel contacts where no heat-insulating layers were adopted. Two different operating temperatures, namely 25 °C and 100 °C, were studied. The results show that the additives notably affect the EHD friction due to formation of the boundary film, which depends on simultaneous effect of the additive type, lubricant bulk temperature and contact conditions, which may, however, increase or decrease. The thus results show that the glycerol Monooleate and Ionic liquid promote EHD friction reduction at 100 °C, namely up to about 9 %, their effect on EHD friction at 25 °C is low and even neglegible. On the other hand, organic film former increases EHD friction up to 4 % at 25 °C, while its effect on EHD friction at 100 °C in neglegible. The changes in EHD friction are in a good agreement with surface energies of adsorbed boundary films, indicating decrease in EHD friction in case of low surface energy adsorbed layer and vice versa. The changes in viscosity due to additive addition were also considered in analysis and were found rather small and not to influence the above mentioned effects.
    Vir: ECOTRIB 2017 [Elektronski vir] (PDF datoteka (1 f.))
    Vrsta gradiva - prispevek na konferenci
    Leto - 2017
    Jezik - angleški
    COBISS.SI-ID - 15589403

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