聚醚醚酮和纳米二氧化硅改性聚四氟乙烯复合材料的摩擦学性能
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兰州理工大学

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Tribological properties of polyetheretherketone and nano-SiO2 filled polytetrafluoroethylene composites
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    摘要:

    为了研究干摩擦条件下聚醚醚酮(PEEK)和纳米二氧化硅(nano-SiO2)填充改性聚四氟乙烯(PTFE)复合材料的摩擦磨损机理,采用共混-冷压-烧结的工艺制备了试样,在LSR-2M型往复摩擦磨损实验机上进行摩擦磨损试验。利用扫描电子显微镜(SEM)和非接触式白光干涉3D轮廓仪表征了对偶表面转移膜及磨痕的微观形貌,X射线能谱分析(EDS)了对偶表面的元素分布,从微观角度揭示了PTFE复合材料的摩擦磨损机理。结果表明:单独填充PEEK和纳米SiO2填料后,PTFE复合材料的摩擦磨损性能均可得到改善。其中,20%PEEK-PTFE复合材料的体积磨损率仅为2.6×10-6mm3/(Nm),15%PEEK-PTFE复合材料的平均摩擦系数为0.18。PEEK减磨效果优于纳米SiO2,PEEK和纳米SiO2复配填充能够协同改进PTFE复合材料的摩擦学性能。经过5h磨损,15%PEEK-PTFE复合材料体积磨损率下降至2.7×10-6mm3/(Nm),3%纳米SiO2-15%PEEK-PTFE复合材料的体积磨损率下降至4.3×10-6mm3/(Nm)。增大对偶表面粗糙度后,两种复合材料的体积磨损率均增大,而平均摩擦系数均减小。

    Abstract:

    In order to study the friction and wear mechanism of PEEK and nano-SiO2 filled PTFE composites under dry friction condition, the friction and wear tests were carried out on LSR-2M reciprocating friction and wear tester. The samples were prepared by the blending-cold pressing-sintering process. Scanning electron microscope (SEM) and non-contact 3D profiler were used to characterize the microscopic morphology of the transfer film and wear track on the counterpart surface, and the X-ray energy spectrum analysis (EDS) was used to characterize the elements distribution on the counterpart surface. The results show that the friction and wear properties of PTFE composites can be improved with PEEK and nano-SiO2 filled separately. Among them, the volume wear rate of 20% PEEK-PTFE composite is only 2.6×10-6mm3/(Nm), and the mean friction coefficient of 15% PEEK-PTFE composite is 0.18. The antifriction effect of the composite that filled with nano-SiO2 is not as good as that of PEEK, but when they are filled together can synergistically improve the tribological properties of PTFE composites. After 5 hours wear, the volume wear rate of 15%PEEK-PTFE composites reduced to 2.7×10-6mm3/(Nm), and 3% nano-SiO2-15%PEEK-PTFE composites reduced to 4.3×10-6mm3/(Nm). When the counterpart surface roughness increased, the volume wear rate of the two composites increased, but the mean friction coefficient decreased.

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  • 收稿日期:2021-12-28
  • 最后修改日期:2022-03-15
  • 录用日期:2022-03-28
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