采用机械球磨法制备了一种层状硅酸盐润滑材料,利用往复摩擦磨损试验机评价了其作为润滑油添加剂对45钢摩擦副的自修复效应,借助扫描电子显微镜（SEM）、能量色散谱仪（EDS）及纳米硬度仪（Nano-hardness indenter）对自修复层进行了表征,探讨了其减摩抗磨及自修复机理。结果表明,层状硅酸盐微粉作为润滑油添加剂具有良好的减摩抗磨及自修复性能,尤其在50N、1.0m/s时,其摩擦因数及质量磨损率分别较基础油降低约49.6%和83.8%。添加剂与摩擦表面发生了复杂的理化作用,诱发形成了较为连续的＂多孔＂氧化膜自修复层,厚度约为1.08μm;表面较为光滑平整,主要由Fe、C、O及微量的Mg、Si等元素构成,具有较高的硬度,有效地降低了摩擦磨损。
A phyllosilicate lubricating material was prepared using mechanical ball-milling method.The self-reconditioning effect of the as-prepared material as oil additive on Fe-based tribopairs was evaluated by employing a reciprocating friction and wear tester.The mechanisms for reducing friction and wear and self-reconditioning were discussed by characterizing the self-reconditioning layer with scanning electron microscope（SEM）,energy dispersive spectroscope（EDS） and nano-hardness indenter.Results indicate the phyllosilicate powders as oil additive exhibit excellent tribological and self-reconditioning properties especially at the load of 50N and velocity of 1.0m/s.The corresponding friction coefficient and mass wear rate decrease by 49.6% and 83.3%,respectively,compared to those of the base oil.An induced continuous multi-apertured self-reconditioning oxide layer has formed on the rubbed surface with a thickness close to 1.08μm due to the complex physicochemical interactions between the additives and rubbed surfaces.The layer shows smooth and possesses high hardness,which contributes to the effective decrease in friction and wear,mainly with Fe,C,O and small content of Mg and Si.
参考文献
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