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首页> 外文期刊>Journal of Applied Polymer Science >Effect of Various Kinds of Fillers on the Tribological Behavior of Polytetrafluoroethyoene Composites Under Dry and Oil-Lubricated Conditions
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Effect of Various Kinds of Fillers on the Tribological Behavior of Polytetrafluoroethyoene Composites Under Dry and Oil-Lubricated Conditions

机译：干燥和油润滑条件下各种填料对聚四氟乙烯复合材料摩擦学性能的影响

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摘要

Polytetrafluoroethylene (PTFE)-based composites filled with various inor- ganic fillers in a volume fraction of 30% were prepared. The tribological behavior of the PTFE composites sliding against AISI52100 steel under dry and liquid paraffin-lubri- cated conditions was investigated on an MHK-500 model ring-on-block test rig. The morphologies of worn surfaces and wear debris were observed with a scanning electron microscope (SEM) and an optical microscope. As the results, different fillers show different effects on the tribological behavior of the PTFE composites, while the com- posite shows much different tribological behavior under lubricated conditions as com- pared with dry sliding. The tribological behavior of the PTFE composites under dry sliding is greatly related to the uniformity and thickness of the transfer films. Only the PTFE composites with a transfer film of good uniformity and proper thickness may have excellent tribological behavior. The PTFE composites show much better tribologi- cal behavior under lubrication of liquid paraffin than under dry sliding, namely, the friction coefficients are decreased by 1 order of magnitude and the wear rate by 1-3 orders of magnitude.. Observation of the worn compo~ite surfaces with SEM indicates that fatigue cracks were generated under lubrication of liquid paraffin, owing to the absorption and osmosis of liquid paraffin into the microdefects of the PTFE composites. The creation and development of the fatigue cracks led to fatigue wear of the PTFE composites. This would reduce the mechanical strength and load-supporting capacity of the PTFE composites. Therefore, the tribological behavior of the PTFE composites under lubrication of liquid paraffin is greatly dependent on the compatibility between the PTFE matrix and the inorganic fillers. In other words, the better is the compati- bility betweenPTFE and fillers the better is the tribological behavior of the composites.
机译：制备了以30％的体积分数填充各种无机填料的聚四氟乙烯（PTFE）基复合材料。在MHK-500环模砌块试验台上，研究了在干燥和液体石蜡润滑条件下在AISI52100钢上滑动的PTFE复合材料的摩擦学行为。用扫描电子显微镜（SEM）和光学显微镜观察磨损表面和磨损碎屑的形态。结果，不同的填料对PTFE复合材料的摩擦学性能有不同的影响，而与干式滑动相比，在润滑条件下，复合材料的摩擦学性能却有很大不同。 PTFE复合材料在干式滑动条件下的摩擦学行为与转移膜的均匀性和厚度密切相关。只有具有良好均匀性和适当厚度的转移膜的PTFE复合材料才能具有出色的摩擦学性能。 PTFE复合材料在液体石蜡润滑下的摩擦学性能比干滑动条件下好得多，即摩擦系数降低了1个数量级，磨损率降低了1-3个数量级。用SEM观察到的表面表明，由于液体石蜡被PTFE复合材料的微缺陷吸收和渗透，在液体石蜡的润滑下产生了疲劳裂纹。疲劳裂纹的产生和发展导致PTFE复合材料的疲劳磨损。这将降低PTFE复合材料的机械强度和负载支撑能力。因此，在液体石蜡润滑下，PTFE复合材料的摩擦学性能在很大程度上取决于PTFE基体与无机填料之间的相容性。换句话说，PTFE和填料之间的相容性越好，复合材料的摩擦学性能越好。

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