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采用MM–200摩擦磨损试验机评价了蛇纹石微粉作为润滑油添加剂对球墨铸铁的减摩抗磨作用。借助扫描电子显微镜、X射线能谱仪、纳米压痕仪、X射线光电子能谱仪等对磨损表面进行了分析,并探讨了其减摩抗磨机理。结果表明:蛇纹石微粉能显著提高球墨铸铁摩擦副的摩擦学性能。当添加量为0.5%(质量分数)时,能使摩擦系数较基础油降低51.5%,磨损量减少29.6%。磨损表面元素主要由Mg,Si,Fe,O,C组成,磨损表面光滑平整且具有较高的纳米力学性能。分析认为:由于蛇纹石微粉呈层片状结构,且表面存在大量的不饱和键而具有很高的化学活性,在摩擦力作用下趋向与摩擦表面发生物理、化学作用,形成铁镁的氧化物、水合氧化物、硅酸盐,铁的碳化物及石墨化碳等物相,可强化摩擦副表面,增强其自润滑能力,提高其减摩抗磨性能。
MM-200 friction and wear testing machine was used to evaluate the anti-friction and anti-wear effect of serpentine micropowder as ductile iron additive on ductile iron. The wear surface was analyzed by means of scanning electron microscope, X-ray energy dispersive spectrometer, nano indenter and X-ray photoelectron spectrometer. The anti-friction and anti-wear mechanism was also discussed. The results show that the serpentine powder can significantly improve the tribological properties of ductile iron friction pair. When the additive amount is 0.5% (mass fraction), the friction coefficient can be reduced by 51.5% and the wear loss by 29.6% compared with the base oil. The wear surface elements are mainly composed of Mg, Si, Fe, O, C, the wear surface is smooth and has high nanomechanical properties. The analysis shows that: As the serpentine micropowder is lamellar structure, and there are a large number of unsaturated bonds on the surface and has a high chemical activity, under the action of friction and friction surface tend to physical and chemical effects, the formation of iron and magnesium oxidation Materials, hydrated oxides, silicates, iron carbides and graphitized carbon can enhance the surface of friction pair, enhance its self-lubricating ability and improve its anti-friction and anti-wear properties.