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首页> 外文期刊>Tribology Transactions >Effect of Aramid Fiber and ZnO Nanoparticles on Friction and Wear of PTFE Composites in Dry and LN{sub}2 Conditions
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Effect of Aramid Fiber and ZnO Nanoparticles on Friction and Wear of PTFE Composites in Dry and LN{sub}2 Conditions

机译：芳纶纤维和ZnO纳米粒子在干燥和LN {sub} 2条件下对PTFE复合材料摩擦磨损的影响

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摘要

The tribological performance of PTFE and PTFE-based composites filled with aramid fiber and ZnO nanoparticles in dry sliding and liquid nitrogen (LN{sub}2) conditions was studied comparitively. The wear scars on the test specimen were observed by scanning electron microscopy (SEM). The transfer films of the composite material formed on the sliding interfaces were studied by X-ray photoelectron spectroscopy (XPS). The tribological test results of the tribo-pairs with two ANSI 440C steel pins sliding on a composite disk showed that, compared with the pure PTFE, the friction coefficient of the PTFE-based composites filled with both aramid fiber and ZnO nanoparticles is reduced in dry sliding in room temperature (RT) air, whereas its friction coefficient is increased in LN{sub}2. The friction coefficient of the composite filled with 5 wt% ZnO nanoparticles alone increases compared to unfilled PTFE in both RT air or in LN{sub}2 conditions. While in LN{sub}2, the friction coefficient of the same 5% ZnO material is lower, and the wear resistance is higher than those under dry sliding, the C-F bond cleavage in PTFE was found in transfer films formed in dry sliding or LN{sub}2 conditions, and the F atoms were combined with Fe atoms from the sliding steel pins.
机译：比较研究了芳族聚酰胺纤维和ZnO纳米颗粒填充的PTFE和PTFE基复合材料在干滑和液氮（LN {sub} 2）条件下的摩擦学性能。通过扫描电子显微镜（SEM）观察到试样上的磨损痕迹。通过X射线光电子能谱（XPS）研究了在滑动界面上形成的复合材料的转移膜。在复合盘上滑动两个ANSI 440C钢销的摩擦副的摩擦学测试结果表明，与纯PTFE相比，充满芳族聚酰胺纤维和ZnO纳米颗粒的PTFE基复合材料的摩擦系数降低了在室温（RT）空气中滑动，而其摩擦系数在LN {sub} 2中增加。与未填充的PTFE相比，仅填充5 wt％ZnO纳米颗粒的复合材料在RT空气或LN {sub} 2条件下的摩擦系数都会增加。在LN {sub} 2中，相同的5％ZnO材料的摩擦系数较低，而耐磨性高于干滑动条件下的摩擦系数，但在干滑动或LN中形成的转移膜中发现PTFE中的CF键断裂在{sub} 2个条件下，F原子与来自滑动钢钉的Fe原子结合。

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