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Applying ionic liquids as oil additives for gearboxes:Going beyond the state of the art by bridging the nano-scale and component level

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Friction 2023年第6期11卷 1057-1078页

作者： Azhaarudeen ANIFA MOHAMED FARUCK Philipp G.GRÜTZMACHER Chia-Jui HSU dominik dworschak Hsiu-Wei CHENG Markus VALTINER Kristof STAGEL Philipp MIKSOVSKY Apurba Ranjan SAHOO Aitor SAINZ MARTINEZ Katharina BICA-SCHRODER Michael WEIGAND Carsten GACHOT Institut für Konstruktionswissenschaften und Produktentwicklung(IKP) Tribology Research DivisionTU WienVienna1060Austria Institut für Angewandte Physik(IAP) Applied Interface Physics research groupTU WienVienna1040Austria Institut für Angewandte Synthesechemie(IAS) Sustainable Organic Synthesis and Catalysis research groupTU WienVienna1060Austria

Ionic liquids(ILs)have been used effectively in many applications for reducing problems related to friction and *** this work,the potential of ILs as an anti-wear and extreme pressure lubricant additive for high load-carrying gearbox applications such as helicopter transmissions has been *** halide-free ILs:P_(8881)(BuO)_(2)PO_(2)^(-)(1)and P_(8881)(MeO)_(2)PO_(2)^(-)(2),which are blended at 5 wt%each into a standard non-additivated FVA2 base oil(BO)are *** solid-liquid interface,friction and load-carrying capacity,and wear(scuffing)behavior are studied on the nano-,lab-,and component-scale,respectively,at a different range of temperature and loading conditions by using the atomic force microscopy(AFM),Schwing-Reib-Verschleiβ(SRV)friction tests,and Brugger tests,as well as forschungsstelle für zahnrader und getriebebau(FZG)back-to-back gear test *** AFM analysis shows nearly no change of adhesion over the full range of studied temperature for the IL blends compared to the ***,IL blends demonstrate a very stable coefficient of friction(COF)of around 0.16,which even decreases with increasing test temperatures ranging from 40 to 120℃.A clear reduction in COF up to 25%is achieved by adding only 5 wt%of the investigated Ils in the BO,and the Brugger tests also show a pronounced enhancement of load-carrying ***,on the component-scale,a significant improvement in gear scuffing performance has been observed for both used IL blends.A detailed characterization of the wear tracks from the SRV friction tests via the transmission electron microscopy(TEM)revealed the formation of a phosphate(P-O)-based amorphous tribo-chemical layer of about 20 nm ***,this work may present an approach for Ils to be used as an additive in conventional lubricants due to their ability to enhance the lubrication properties,making them an alternative lubricant solution for high load-carrying gearbox applications.

关键词： ionic liquids(ILs) additives gears scuffing friction load-carrying capacity

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