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首页> 外文期刊>Journal of Applied Polymer Science >Friction and Wear Characteristics of Fiber-and Whisker-Reinforced PTFE Composites under Oil Lubricated Conditions
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Friction and Wear Characteristics of Fiber-and Whisker-Reinforced PTFE Composites under Oil Lubricated Conditions

机译：油润滑条件下纤维和晶须增强的PTFE复合材料的摩擦磨损特性

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Four kinds of polytetrafluoroethylene (PTFE)-based composites,such as pure PTFE,PTFE +30(vol.)% carbon fiber,PTFE +30(vol.)% glass fiber,and PTFE+30(vol.)%K_2TI_6O_(13) whisker composite,were prepared.The friction and wear properties of these fiber- and whisker-reinforced PTFE composites sliding against GCr15-bearing steel(SAE52100 steel) under both dry and liquid paraffin lubricated conditions were studied by using an MHK-500 ring-block wear tester (Timken wear tester).Then the worn surfaces of these PTFE composites and the transfer films formed on the surface of GCr15-bearing steel were investigated by using a Scanning Electron Microscopy (SEM) and an Optical Microscope,respectively.Experimental results show that the friction and wear properties of the PTFE composites reinforced with carbon fiber,glass fiber,and a K_2Ti_6O_(13) whisker can be greatly improved by lubrication with liquid paraffin,and the friction coefficients of these PTFE composites can be decreased by one order of magnitude compared to those under dry friction conditions.Meanwhile,the wear of the fiber- and whisker-reinforced PTFE compsoites in liquid paraffin lubrication increases with the increase of load,but the friction coefficients of these TPFE composites first decrease with the increase of load,and then increase with teh nicrease of load.The variations of friction coefficients with load for these PTFE compostites in liquid paraffin lubrication can be described properly by the Stribeck;s curve as given in this article.However,when the load increases to the load limits of the PTFE composites,their friction and wear increase sharply.SEM and optical microscope investigations show that the interactions between liquid paraffin and the PTFE composites,especially the absorption of liquid paraffin into the surface layers of the PTFE composites,caeate some obvious cracks on the worn surfaces of the PTFE composites.The creation and the development of the cracks reduce the load-carrying capacity of the PTFE composites,and therefore lead to the increase of the friction and wear of the PTFE composites under higher loads.Meanwhile,the transfer of the fiber- and whisker-reinforced PTFE composities onto the counterfaces can be greatly reduced by lubrication with liquid paraffin,but the transfer still takes place.
机译：纯PTFE，PTFE +30（vol。）％碳纤维，PTFE +30（vol。）％玻璃纤维和PTFE + 30（vol。）％K_2TI_6O_（13）四种聚四氟乙烯（PTFE）基复合材料通过使用MHK-500环，研究了这些纤维和晶须增强的PTFE复合材料在干石蜡和液体石蜡润滑条件下在GCr15轴承钢（SAE52100钢）上滑动的摩擦和磨损性能。然后使用扫描电子显微镜（SEM）和光学显微镜分别研究了这些PTFE复合材料的磨损表面以及在GCr15轴承钢表面上形成的转移膜的磨损性能。结果表明，用液体石蜡润滑可以大大改善碳纤维，玻璃纤维和K_2Ti_6O_（13）晶须增强的PTFE复合材料的摩擦磨损性能，并且可以将这些PTFE复合材料的摩擦系数降低一级的同时，纤维和晶须增强的PTFE复合材料在液体石蜡润滑中的磨损随着载荷的增加而增加，但是这些TPFE复合材料的摩擦系数首先随着载荷的增加而降低，这些PTFE堆肥在液体石蜡润滑中的摩擦系数随载荷的变化可以通过本文的Stribeck曲线适当地描述。但是，当载荷增加到载荷极限时SEM和光学显微镜研究表明，液体石蜡与PTFE复合物之间的相互作用，特别是液体石蜡被PTFE复合物的表面层吸收，在其表面形成一些明显的裂纹。 PTFE复合材料的磨损表面。裂纹的产生和发展降低了PTFE的承载能力PTFE复合材料，因此会导致在较高载荷下PTFE复合材料的摩擦和磨损增加。同时，通过用液体石蜡润滑可以大大减少纤维和晶须增强的PTFE复合材料到对接面上的转移，但是转移仍在进行。

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