PTFE基复合材料摩擦起电规律及其对摩擦学特性影响的研究

发布时间：2018-04-11 19:18

本文选题：PTFE基复合材料 + 摩擦起电电压　；参考：《合肥工业大学》2017年硕士论文

【摘要】：本文研究三种PTFE基复合材料(Cu/PTFE、CuO/PTFE、Gr/PTFE)与45钢摩擦磨损过程中产生的摩擦起电现象,分析了影响摩擦起电电压的影响因素;探讨了影响Cu/PTFE复合材料摩擦磨损性能的因素;研究了Cu/PTFE复合材料与45钢摩擦磨损过程中摩擦起电电压与其摩擦学特性的关联性;分析Cu/PTFE复合材料摩擦起电电压对摩擦磨损机理的影响。采用3D激光扫描显微镜分析不同摩擦起电电压下45钢表面转移膜厚度,利用扫描电子显微镜和能谱分析仪分析转移膜微观形貌和元素组成。通过对PTFE基复合材料与45钢的摩擦起电性能与摩擦学特性的研究,以期获得调控复合材料摩擦磨损性能的新手段。通过分析与研究,得出如下结论:⒈各因素对PTFE基复合材料摩擦起电性能的影响PTFE基复合材料的摩擦起电电压随载荷的增加而增大;随着速度的增大,复合材料摩擦起电电压逐渐增大;填料含量一定时,PTFE基复合材料摩擦起电电压随填料粒径的增加而增大;导电性能较好的填料(例如Cu或Gr),其复合材料摩擦起电电压随填料含量的增加呈先增加后减小的趋势;而对于非导电的填料CuO,其复合材料摩擦起电电压随填料含量的增加而逐渐增大;PTFE基复合材料摩擦起电电压随复合材料介电常数的增加而逐渐减小。⒉Cu/PTFE复合材料摩擦学特性的影响因素Cu/PTFE复合材料摩擦系数随载荷的增大而逐渐减小,磨损量随载荷的增加而逐渐增大;随试验速度的增大,PTFE基复合材料摩擦系数逐渐减小,磨损量则随速度的增大而增加;随着填料粒径的增大,Cu/PTFE复合材料摩擦系数逐渐增大,磨损量随填料粒径的增大而逐渐增大;Cu/PTFE复合材料摩擦系数随填料含量的增大而增加,复合材料磨损量随填料含量的增加呈先减小后略有增加的趋势,且填料含量为10wt%时,复合材料磨损量达到最小值。⒊Cu/PTFE复合材料摩擦学特性与摩擦起电性能的关联性Cu/PTFE复合材料的摩擦系数随摩擦起电电压的增加而逐渐减小,磨损量随摩擦起电电压的增大而增加。⒋Cu/PTFE复合材料摩擦起电性能对其磨损机理的影响Cu/PTFE复合材料与45钢摩擦过程中产生的摩擦起电现象,摩擦起电电压一方面促使填料颗粒富集在45钢表面并促进转移膜的形成,从而优化复合材料的摩擦学特性;另一方面,摩擦起电电压促使复合材料内填料颗粒逐渐向摩擦表面富集,进一步提高复合材料的摩擦磨损性能。
[Abstract]:In this paper, the tribological generation of three kinds of PTFE matrix composites, CuO / PTFEFE-Gr-PTFEE) and 45 steel, is studied, the factors affecting the friction voltage are analyzed, and the factors affecting the friction and wear properties of Cu/PTFE composites are discussed.The relationship between the friction starting voltage and the tribological properties of Cu/PTFE composites and 45 steel during friction and wear was studied, and the effect of the friction starting voltage on the friction and wear mechanism of Cu/PTFE composite was analyzed.The thickness of transfer film on 45 steel surface was analyzed by 3D laser scanning microscope and the microstructure and element composition of the transfer film were analyzed by scanning electron microscope and energy spectrum analyzer.The electrical and tribological properties of PTFE matrix composites and 45 steel were studied in order to obtain a new method to control the friction and wear properties of composites.Through analysis and research, the following conclusions are drawn: the effect of different factors on the friction initiation properties of PTFE matrix composites; the friction initial voltage of PTFE matrix composites increases with the increase of load, and increases with the increase of velocity.The friction starting voltage of PTFE matrix composites increases with the increase of the particle size of filler, and the friction starting voltage of PTFE matrix composites increases with the increase of filler size.The friction starting voltage of the composites with better conductive properties (such as Cu or Gr-O) increased first and then decreased with the increase of filler content.For non-conductive filler CuO, the friction initial voltage of PTFE matrix composites increases with the increase of filler content, and decreases with the increase of dielectric constant of PTFE composites.The friction coefficient of Cu/PTFE composites decreases with the increase of load.The friction coefficient of PTFE matrix composites decreases with the increase of test speed, and the wear rate increases with the increase of velocity, and the friction coefficient of Cu / PTFE composites increases with the increase of filler particle size.The friction coefficient of Cu- / PTFE composites increases with the increase of filler particle size. The wear rate of composites decreases first and then increases slightly with the increase of filler content, and when the filler content is 10 wt%, the wear rate of the composites increases with the increase of filler content, and the friction coefficient of Cu- / PTFE composites increases with the increase of filler content.The relationship between tribological Properties and tribological Properties of Cu/PTFE Composites with minimum Wear capacity of 路3Cu / PTFE the friction coefficient of Cu/PTFE composites decreases with the increase of the starting voltage of friction.Effect of friction Electrical Properties on Wear Mechanism of 4Cu / PTFE Composites with the increase of starting Voltage of friction the friction initiation phenomenon of Cu/PTFE composite and 45 steel is observed.On the one hand, tribological characteristics of the composite are optimized by the friction starting voltage, on the one hand, the filler particles are enriched on the surface of 45 steel and the transfer film is formed, on the other hand,The tribological voltage induces the accumulation of filler particles to the friction surface and further improves the friction and wear properties of the composites.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB333

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