Abstract
A new series of tricresyl phosphate (TCP)-based ionic liquids (ILs) were synthesized by mixing TCP with lithium bis(trifluoromethylsulfonyl) imide (LiTFSI). Their tribological properties in pentaerythritol ester were investigated using an Optimol SRV oscillating friction and wear tester. LiTFSI/TCP (0.75/1 molar ratio, TCPL3) exhibits the best friction-reducing and antiwear properties under given experimental conditions. Compared with conventional lubricant additive TCP, TCPL3 could significantly improve the tribological properties of polyol ester, especially under high-temperature condition. Worn surfaces were analyzed using scanning electron microscope (SEM) and X-ray photoelectron spectrometer (XPS). Surface analysis demonstrates that the outstanding lubricating properties are attributed to the formation of boundary film which is composed of iron fluoride, lithium phosphate, and lithium polyphosphates. Unexpectedly, a remarkable synergistic effect between TCPL3 and typical high-temperature antioxidant N-phenyl-α-naphthylamine in terms of antioxidation property was also observed.
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