【摘要】 以注塑成型法制备了聚四氟乙烯(PTFE)填充PA1010复合材料,利用M-2000磨损试验机测试了该复合材料与GCr15轴承钢对摩时的摩擦磨损性能,并用扫描电子显微镜(SEM)观察了试样磨损表面形貌.结果表明:PTFE填充PA1010可显著改善尼龙复合材料的摩擦磨损性能.w(PTFE)为25%时,复合材料的摩擦学综合性能最佳.复合材料的摩擦系数和磨损体积随施加载荷、滑动速度的增加分别呈现降低和增加的趋势.在200 N载荷下,复合材料磨损主要为磨粒磨损;在400 N载荷下,磨损表现为黏着磨损和磨粒磨损共同作用.在滑动速度为0.21 m/s时,材料摩擦表面因挤压发生塑性流变,其磨损机理为磨粒磨损;在滑动速度为0.84 m/s,复合材料因热疲劳和应力疲劳发生剥层,磨损机理转变为疲劳剥层磨损.更多还原

【Abstract】 The polyamide 1010(PA1010) composite filled with polytetrafluoroethylene(PTFE) was prepared by an injection moulding.The friction and wear performances of the composite sliding against GCr15 bearing steel were investigated on the M-2000 ring-block test rig,and their worn surface morphology was observed by a scanning electron microscope.The results show that the addition of PTFE obviously improves the tribological properties of PA1010.The optimal tribological properties are achieved while w(PTFE) of 25%.With the increasing of normal load and sliding speed,the friction coefficient decreased and the wear volume increased,respectively.The main wear of the composite is abrasive wear under the load of 200 N,and the adhesive wear and abrasive wear play the dominant roles together while the load of 400 N.When the sliding speed is 0.21 m/s,the plastic flow occurs owing to extrusion and the main wear is abrasion.As the speed increases to 0.84 m/s,the layer peeling is observed due to thermal and stress fatigue,and the wear changes to fatigue peeling accordingly.更多还原