Yuhong Cui,Shenghua Xue,Zihan Liu,Tiantian Wang,Shujuan Liu,Qian Ye,Feng Zhou,Weimin Liu
Nanomaterials play an important role in reducing friction and wear when used as lubricating additives. Due to synergistic effects , nanocomposites often have superior lubrication properties than individual materials. Therefore, based on the structural differences between MXene and phenolic resin modified polytetrafluoroethylene ( m PTFE), MXene@ m PTFE composites with multiple heterogeneous structures are designed and constructed. As expected, the synergistic effect of layered MXene and m PTFE nanoparticles endows MXene@ m PTFE excellent tribological performance . Under the action of shear force, m PTFE nanoparticles accelerate the interlayer slip between MXene nanosheets , and m PTFE nanoparticles with high hardness and thermal stability act as ball bearings to improve the extreme pressure characteristics of the oil. Compared to base oil (PAO-6), the coefficient of friction (COF) decreased from 0.644 to 0.111, the wear volume decreased by 92.7 %, and the bearing capacity increased to 750 N. This study provides new implications for the development of nanolubricant additives.
A series of protic ionic liquids (PILs) containing dibutyldithiophosphate were simply synthesised and used as lubricant additive in base emulsion. The physico-chemical and lubricating properties of PILs in emulsion were systematically investigated. The stability of prepared emulsions containing PILs were similar with base emulsions by particle size distribution tests. Compared with traditional additive of polysulfide, the PILs in emulsion exhibited superior lubricating properties under harsh conditions. Surprisingly, the oil-miscible O-PILs in emulsion showed better friction and wear reduction than water-miscible T-PILs in emulsion. The stable protective films formed on the steel surface by results of scanning electron microscope and X-ray photoelectron spectroscopy were the main reason for the preferable performance.
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