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首页> 外文期刊>Journal of Applied Polymer Science >Friction and Wear Characteristics of Ceramic Particle Filled Polytetrafluoroethylene COmposites Under Oil-Lubricated Conditons
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Friction and Wear Characteristics of Ceramic Particle Filled Polytetrafluoroethylene COmposites Under Oil-Lubricated Conditons

机译：油润滑条件下填充陶瓷颗粒的聚四氟乙烯复合材料的摩擦磨损特性

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摘要

Five kinds of polytetrafluoroethylene (PTFE)-based composites were prepared: PTFE,PTFE+30 vol% SiC,PTFE+30vol% Si_3N_4,PTFE+30vol%BN, and PTFE+30 vol % B_2O_3. The friction and wear properties of these ceramic particle filled PTFE composites sliding against GCr15 bearing steel under both dry and liquid paraffin lubricated conditions were studied by using an MHK-500 ring-block wear tester. The worn surfaces and the transfer films formed on the surface fo the GCr15 bearing steel of these PTFE composites were investigated by using a scanning electron microscope (SEM) and an optical microscope, respectively. The experimental results show that the ceramic particles of SiC, Si_3N_4, BN, and B_2O_3 can greatly reduce the wear of the PTFE composites; the wear-reducing action of Si_3N_4 is the most effective, that of SiC is the next most effective, then the BN, and that of B_2O_3 is the worst. We found that B_2O_3 reduces the friction coefficient of the PTFE composite but SiC, Si_3N_4, and BN increase the friction coefficients of the PTFE composites. However, the friction and wear properties of the ceramic particle filled PTFE composites can be greatly improved by lubrication with liquid paraffin, and the friction coefficients of the PTFE composites can be decreased by 1 order of magnitude. Under lubrication of liquid paraffin the friction coefficients of these ceramic particle filled PTFE composites decrease with an increase of load, but the wear of the PTFE composites increases with a load increase. The variations of the friction coefficients with load for these ceramic particle filled PTFE composites under lubrication of liquid paraffin can be properly described by the relationship between the friction coefficient (#mu#) and the simplified Sommerfeld variable N/P as given here. The investigations of the frictional surfaces show that the ceramic particles SiC, Si_3N_4,BN, and B_2O_3 enhance the adhesion of the transfer films of the PTFE composites to the surface of GCr15 bearing steel, so they greatly reduce the wear of the PTFE composites. However, the transfer of the PTFE composites onto the surface of the GCr15 bearing steel can be greatly reduced by lubrication with liquid paraffin, but the transfer still takes place. Meanwhile, the interactions between the liquid paraffin and the PTFE composites, especially the absorption of liquid paraffin into the surface layers of the PTFE composites, create some cracks on the worn surfaces of the ceramic particle filled PTFE composites; the creation and development of these cracks reduces the load-supporting capacity of the PTFE composites. This leads to the deterioration of the friction and wear properties of the PTFE composites under higher loads in liquid paraffin lubrication.
机译：制备了五种基于聚四氟乙烯（PTFE）的复合材料：PTFE，PTFE + 30％（体积）SiC，PTFE + 30％（体积）Si_3N_4，PTFE + 30％（体积）BN和PTFE + 30％（体积）B_2O_3。使用MHK-500环块磨损测试仪研究了这些陶瓷颗粒填充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性能。通过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GCr15轴承钢表面的磨损表面和转移膜。实验结果表明，SiC，Si_3N_4，BN和B_2O_3的陶瓷颗粒可以大大降低PTFE复合材料的磨损。 Si_3N_4的减磨作用最有效，SiC的减磨作用次之，其次是BN，B_2O_3的减磨作用最差。我们发现B_2O_3降低了PTFE复合材料的摩擦系数，而SiC，Si_3N_4和BN则增加了PTFE复合材料的摩擦系数。然而，通过用液体石蜡润滑可以极大地改善陶瓷颗粒填充的PTFE复合材料的摩擦和磨损性能，并且可以将PTFE复合材料的摩擦系数降低1个数量级。在液体石蜡的润滑下，这些陶瓷颗粒填充的PTFE复合材料的摩擦系数随着载荷的增加而降低，但是PTFE复合材料的磨损随着载荷的增加而增加。这些陶瓷颗粒填充的PTFE复合材料在液体石蜡润滑下的摩擦系数随载荷的变化可以通过摩擦系数（＃mu＃）与简化的Sommerfeld变量N / P之间的关系正确描述，如此处所示。摩擦表面的研究表明，陶瓷颗粒SiC，Si_3N_4，BN和B_2O_3增强了PTFE复合材料的转移膜对GCr15轴承钢表面的附着力，因此大大降低了PTFE复合材料的磨损。但是，通过用液体石蜡润滑可以大大减少PTFE复合材料在GCr15轴承钢表面上的转移，但是仍然发生转移。同时，液体石蜡与PTFE复合材料之间的相互作用，特别是液体石蜡在PTFE复合材料表面层中的吸收，在填充了陶瓷颗粒的PTFE复合材料的磨损表面上产生了一些裂缝。这些裂纹的产生和发展降低了PTFE复合材料的载荷支撑能力。这导致在液体石蜡润滑中较高载荷下PTFE复合材料的摩擦和磨损性能下降。

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