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首页> 外文期刊>Journal of Applied Polymer Science >Friction and wear behavior of PTFE composites filled with rare earth compounds under oil-lubricated conditions
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Friction and wear behavior of PTFE composites filled with rare earth compounds under oil-lubricated conditions

机译：油润滑条件下填充稀土化合物的PTFE复合材料的摩擦磨损性能

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Polytetrafluoroethylene (PTFE)-based composites, filled with CeO2, CeF3, and La2O3 in volume contents of 5, 10, 15, 20, and 30%, were prepared. Then, the friction and wear behavior of these PTFE composites sliding against GCr15 bearing steel under both dry and liquid paraffin-lubricated conditions was evaluated using an MHK-500 ring-on-block wear tester. Finally, the worn surfaces and the transfer films of these PTFE composites were investigated using a scanning electron microscope (SEM) and an optical microscope. Experimental results showed that filling CeO2, CeF3, and La2O3 into PTFE can reduce the wear of the PTFE composites by 1-2 orders of magnitude. When the content of CeO2 in PTFE is 15%, the friction and wear properties of the CeO2-filled PTFE composite are the best. Meanwhile, when the content of La2O3 in PTFE is between 15 and 20%, the PTFE composite filled with La2O3 exhibits excellent friction and wear-reducing properties. However, the friction coefficient of the CeF3-filled PTFE composite increases but its wear decreases with increase in the content of CeF3 from 5 to 30%. The friction and wear-reducing properties of CeO2-, CeF3-, and La2O3-filled PTFE composites can be greatly improved by lubrication with liquid paraffin, but the limit loads of the PTFE composites decrease with increase in the content of CeO2, CeF3, and La2O3 in PTFE (from 5 to 30%) under the same conditions. Investigations of worn surfaces show that the interaction between liquid paraffin and the CeO2-, CeF3-, and La2O3-filled PTFE composites, especially the absorption of liquid paraffin into the microdefects of the PTFE composites, creates some cracks on the worn surfaces of the PTFE composites and that the creation and development of the cracks reduces the mechanical strength and the load-supporting capacity of the PTFE composites. However, with increase of the content of CeO2, CeF3, and La2O3 in the PTFE, the microdefects in the PTFE composites also increase, which would lead to increase in the number of the cracks on the worn surfaces of the PTFE composites under load and, so, in turn, lead to the reduction of the limit loads of the CeO2-, CeF3-, and La2O3-filled PTFE composites under lubrication with liquid paraffin.
机译：制备了以体积百分比为5、10、15、20和30％的CeO2，CeF3和La2O3填充的聚四氟乙烯（PTFE）基复合材料。然后，使用MHK-500块环式磨损测试仪评估了这些PTFE复合材料在干和液体石蜡润滑条件下在GCr15轴承钢上滑动的摩擦和磨损行为。最后，使用扫描电子显微镜（SEM）和光学显微镜研究了这些PTFE复合材料的磨损表面和转移膜。实验结果表明，将CeO2，CeF3和La2O3填充到PTFE中可以将PTFE复合材料的磨损降低1-2个数量级。当PTFE中CeO2的含量为15％时，CeO2填充的PTFE复合材料的摩擦和磨损性能最佳。同时，当PTFE中La 2 O 3的含量在15至20％之间时，填充有La 2 O 3的PTFE复合材料表现出优异的摩擦和降低磨损的性能。然而，CeF3填充的PTFE复合材料的摩擦系数增加，但是随着CeF3含量从5％增至30％，其磨损降低。用液态石蜡润滑可以大大改善CeO2-，CeF3-和La2O3填充的PTFE复合材料的摩擦和磨损性能，但是随着CeO2，CeF3和CeO2含量的增加，PTFE复合材料的极限载荷降低。在相同条件下在PTFE中添加La2O3（5％至30％）。对磨损表面的研究表明，液体石蜡与CeO2，CeF3和La2O3填充的PTFE复合材料之间的相互作用，尤其是液体石蜡对PTFE复合材料的微缺陷的吸收，在PTFE磨损表面上产生了一些裂纹。复合材料，裂缝的产生和发展降低了PTFE复合材料的机械强度和负载支撑能力。但是，随着PTFE中CeO2，CeF3和La2O3含量的增加，PTFE复合材料中的微缺陷也增加，这将导致在负载下PTFE复合材料磨损表面上的裂纹数量增加，并且，因此，在使用液体石蜡润滑的情况下，依次降低了CeO2，CeF3和La2O3填充的PTFE复合材料的极限载荷。

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