多壁碳纳米管/环氧树脂纳米复合材料的摩擦磨损性能研究

Tribological Behavior of Multi-Walled Carbon Nanotube/Epoxy Resin Nanocomposites

采用浇铸法,利用超声分散制备了多壁碳纳米管(MWNTs)/环氧树脂(EP)纳米复合材料,研究了MWNTs的添加量及分散程度对复合材料表面形貌和摩擦磨损性能的影响,并探讨了影响MWNTs/EP复合材料摩擦磨损性能的因素.结果表明:随着MWNTs加入量的提高(1%～4%),复合材料的摩擦系数和磨损率均呈现降低趋势,摩擦系数由0.60降到0.22,磨损率由1.11×10-4mg/(N·m)降为2.22×10-5mg/(N·m);在MWNTs添加量(1%)相同的情况下,MWNTs分散程度高的复合材料的摩擦性能更好.纯环氧树脂与45#钢对摩时发生粘着磨损和疲劳剥落,而由于MWNTs的增强和自润滑作用,MWNTs/EP复合材料的粘着磨损和疲劳剥落显著减轻.

Carbon nanotubes (WMNTs)/epoxy resin nanocomposites were prepared making use of ultrasonic dispersion and casting molding. The influence of the MWNTs on the friction and wear behaviors of the resulting nanocomposites sliding against AISI-1045 steel was investigated on an Optimol-SRV tribotester at ambient condition. The worn surface morphologies of the composites were observed on a scanning electron microscope. It was found that the incorporation of the MWNTs contributed to greatly increase the friction-reducing and antiwear abilities of the WMNTs/EP composites. Moreover, the MWNTs/EP composite prepared in the presence of ultrasonic dispersion with a larger power had better friction-reducing and antiwear abilities than that prepared with the ultrasonic dispersion of a smaller power, which was attributed to the different dispersion uniformity of the WMNTs in the resin matrix thereat. The epoxy resin was dominated by adhesion fatigue peeling off and severe plastic deformation as it slid against the steel, while the adhesion and plastic deformation were considerably abated for the nanocomposites under the same test conditions, which was attributed to the strengthening and self-lubricating functions of the WMNTs.