Tribological Mechanism of Graphene and Ionic Liquid Mixed Fluid on Grinding Interface under Nanofluid Minimum Quantity Lubrication

Abstract Graphene has superhigh thermal conductivity up to 5000 W/(m·K), extremely thin thickness, mechanical strength and nano-lamellar structure with low interlayer shear strength, making it possess great potential in minimum quantity lubrication (MQL) grinding. Meanwhile, ionic liquids (ILs) have higher better stability than vegetable oils, which are frequently used as MQL grinding fluids. And ILs vapor pressure, thereby avoiding film boiling These excellent properties make also immense However, the performance of graphene liquid mixed fluid under nanofluid (NMQL), its tribological mechanism on abrasive grain/workpiece interface, still unclear. This research firstly evaluates nanofluids (graphene/IL nanofluids) NMQL experimentally. The evaluation shows that graphene/IL can further strengthen both cooling lubricating performances compared using only. specific energy force ratio be reduced by over 40% at depth 10 μm. Workpiece machined surface roughness decreased 10%, temperature lowered 50 ℃ 30 Aiming unclear nanofluids, molecular dynamics simulations for interface performed explore formation physical adsorption film. show is a boundary state. IL molecules absorb groove-like fractures grain wear flat face form film, nanosheets enter into decrease contact area between workpiece. Compared grinding, average tangential 10.8%. effect principal causes enhanced interface. EDS XPS analyses carried out chemical reaction base happens reactions workpiece material, producing FeF 2 , CrF 3 BN. fresh oxidized air, NiO, Cr O Fe . constituted fluorides, nitrides oxides together. combined action obtain performance.