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针对高频摆动关节轴承摩擦热对自润滑纤维复合材料摩擦磨损性能的影响,研制了高频使用条件下的玻璃纤维增强聚四氟乙烯(GF/PTFE)自润滑纤维复合材料,利用MYB~500高频高载摆动摩擦磨损试验机,对其进行不同摩擦温度下的摩擦磨损性能测试,研究摩擦热作用下材料自润滑性能和磨损性能衰退特征,分析磨损产物和摩擦表面以及不同摩擦温度下材料的磨损机理。结果表明,摩擦热对材料自润滑性能影响显著,适当的摩擦温度范围能够保证材料的自润滑性能,摩擦温度和摩擦因数之间互为耦合作用,对材料的磨损性能具有一定的影响;高摩擦热作用于自润滑过程及机理的改变,造成材料的磨损性能衰退现象。因此,不同温度下材料的磨损特征具有明显的差异化,其中低摩擦温度下(60~120℃)材料自润滑性能优异,磨损率很低;140℃摩擦温度条件下材料摩擦磨损性能开始衰退;材料在高摩擦温度下(140~180℃)的磨损初期自润滑性能良好、磨损轻微,而中后期磨损严重。微观分析表明,低摩擦温度下材料的磨损机理以轻微粘着和疲劳磨损为主;高摩擦温度下材料的磨损以片状剥落、纤维剪切破坏为主,且磨损面局部损伤特征明显,磨损严重。 相似文献
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为研究具有层状结构和球状结构的纳米填料之间的相互作用对聚四氟乙烯(PTFE)复合材料摩擦磨损行为的影响,采用冷冻干燥超声共混-冷压-热烧结法制备纳米二氧化硅(nano-SiO2)和氧化石墨烯(GO)填充改性PTFE复合材料。利用LSM-2R往复式摩擦磨损试验机测试干摩擦条件下nano-SiO2和GO复配改性PTFE复合材料的摩擦学性能,采用MicroXAM-800非接触式三维表面轮廓仪、扫描电子显微镜(SEM)和能谱仪(EDS)分析表征转移膜形貌、元素分布和磨痕表面三维形貌,从微观层面揭示nano-SiO2和GO的减摩机制。结果表明:单独填充nano-SiO2与GO均可改善PTFE复合材料的摩擦学特性,其中在较低添加量下,GO在提高PTFE耐磨性方面明显优于nano-SiO2;GO和nano-SiO2复配填充时存在协同效应,与单一填充相比进一步改善了复合材料的摩擦学性能;相比于纯PTFE,3%nano-SiO2/0.5%GO/PTFE复合材料的磨损率降低60.36%。机制分析表明,协同作用和均匀连续转移膜的形成是nano-SiO2和GO增强PTFE复合材料性能优异的主要原因。 相似文献
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采用冷压成型、自由烧结工艺分别制备了青铜粉、聚酰亚胺、二硫化钼和石墨填充改性的聚四氟乙烯复合材料,在改装的M-2000型摩擦磨损试验机上考察了材料的二次转移摩擦学性能;用扫描电子显微镜对磨损表面进行观察和分析。结果表明:增加载荷有利于提高转移膜与基底的结合强度;填料种类对PTFE复合材料二次转移膜的摩擦学性能有影响,在本实验条件下(干摩擦、室温、滑动速度为0.42m/s、接触载荷为30N),以PTFE复合材料作为润滑剂提供源使用时,PTFE/MoS2、PTFE/Graphite复合材料形成的二次转移膜最好,PTFE/Bronze复合材料二次转移膜次之,PTFE/PI复合材料形成二次转移膜的能力最差。 相似文献
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铅和氧化铅填充聚四氟乙烯自润滑复合材料减磨性能研究 总被引:4,自引:0,他引:4
通过向聚四氟乙烯分别加入铅和氧化铅制取了两种复合自润滑材料。通过实验研究 ,探讨了这两种填充材料对填充聚四氟乙烯复合材料摩擦学性能的影响 ,并通过微观形貌的研究 ,从减磨机理方面进行了对比分析 ,得出了若干有益的结论。 相似文献
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静摩擦因数与表面粗糙度关系的实验分析 总被引:1,自引:0,他引:1
设计了可进行静摩擦因数测定的实验装置。分别对材料(45钢、HT35—61、QT80-2)在相同加工方法、相同表面纹理、载荷恒定、干摩擦条件下,改变表面粗糙度时的静摩擦因数进行了测定。实验得出静摩擦因数随表面粗糙度的变化关系。 相似文献
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纳米金属粉填充Ekonol/PTFE复合材料的摩擦磨损性能研究 总被引:1,自引:0,他引:1
评价了分别用不同体积含量的纳米镍粉和纳米铜粉填充聚苯酯/聚四氟乙烯(Ekonol/PTFE)复合材料体系的力学性能,利用M-200型磨损试验机研究了纳米Ni、纳米Cu含量对Ekonol/PTFE复合材料摩擦学性能的影响,借助扫描电子显微镜和能谱分析手段考察试样磨损表面和磨屑,并探讨其摩擦磨损机制。结果表明,纳米Ni能在一定范围内增加Ekonol/PTFE复合材料的冲击强度;纳米金属粉填入量较小时均能增加复合材料的洛氏硬度。纳米Ni与纳米Cu均能增加Ekonol/PTFE复合材料的摩擦因数并降低磨损率。其原因在于纳米金属粉在复合材料摩擦表面富集,通过金属分子间的吸引作用,增大复合材料的摩擦因数。 相似文献
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Sliding Wear of the Hybrid Kevlar/PTFE Fabric Reinforced Phenolic Composite Filled with Nano-titania 总被引:1,自引:0,他引:1
The Kevlar/polytetrafluroethylene(Kevlar/PTFE) fabric composite can be used as a self-lubricating liner of the self-lubricating bearing.Many types of nano-particles can improve the tribological performance of the polymer-based composite.Unfortunately,up to now,published work on the effect of nano-particles on the tribological performance of the fabric composite which can be used as a self-lubricating liner is quite scarce.Therefore,for the purpose of exploring a way to significantly improve the tribological performance of the fabric composite,the tribological performance of the Kevlar/PTFE fabric composite filled with nano-titania is evaluated by using the block-on-ring wear tester.The scanning electron microscopy is utilized to observe the morphologies of worn surfaces of the fabric composites and the counterparts.The tensile properties of the composites are evaluated on the universal material testing machine.The test results show that the addition of nano-titania at a proper mass fraction of the matrix resin improves the wear resistance and the tensile strength,decreases the friction coefficient,and makes the wear volume of the composite reach a relative steady state more quickly;plastic deformation and microcutting are important for the wear of the fabric composite;a lubricating layer is formed on the worn surface of the composite during sliding,and the lubricating layer is critical for the tribological performance of the composite;the formation and properties of the lubricating layer are influenced by the nano-titania particles.The proposed study on the effect of nano-titania on the tribological performance of the Kevlar/PTFE fabric composite,especially on the evolution of the worn surface of the composite,provides the basis for further understanding of the influence mechanism of the nano-particles on the tribological performance of the composite and explores a method of improving the tribological performance of the composite. 相似文献
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Tribological Behavior of Carbon-Nanotube-Filled PTFE Composites 总被引:3,自引:0,他引:3
Carbon nanotube/polytetrafluoroethylene (CNT/PTFE) composites with different volume fractions were prepared and their friction and wear properties were investigated using a ring-on-block under dry conditions. It was found that CNTs signifi-cantly increased the wear resistance of PTFE composites and decreased their coefficient of friction. PTFE composites with 15–20 vol.% CNTs exhibited very high wear resistance. The significant improvements in the tribological properties of CNT/PTFE composites are attributed to the super-strong mechanical properties and the very high aspect ratio of CNTs. The CNTs greatly reinforce the structure of the PTFE-based composites and thereby greatly reduce the adhesive and plough wear of CNT/PTFE composites. The CNTs are released from the composite during sliding and transferred to the interface of the friction couples. They thus serve as spacers, preventing direct contact between the mating surfaces and thereby reducing both wear rate and friction coefficient. 相似文献
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采用机械共混-冷压成型-烧结的工艺制备了PEEK、PPS填充PTFE基粘弹.摩擦型阻尼材料,用环-块式磨损试验机研究了在干摩擦条件下的摩擦磨损性能;用扫描电子显微镜观察磨损表面形貌和内部组织结构。结果表明:混合填充PEEK和PPS时,2种填充物的比例对材料的摩擦因数影响不大,当二者含量相近时,摩擦因数最大;填充物对磨损性能的影响与对摩擦因数的相同;随着PEEK含量的增加和PPS含量的减少,材料的磨损方式由疲劳剥落磨损为主转变为犁削、粘着磨损;PTFE含量的增加,使得复合材料的摩擦因数减小,而磨损有所增大。综合考虑认为,PTFE与适当比例的PEEK/PPS混合填充,具有合适的摩擦因数和较好的耐磨性,能够满足特殊工况下阻尼材料的需要。 相似文献
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Solid lubricants used in aerospace applications must provide low friction and a predictable operation life over an extreme
range of temperatures, environments and contact conditions. PTFE and PTFE composites have shown favorable tribological performance
as solid lubricants. This study evaluates the effect of temperature on the friction coefficient of neat PTFE, a PTFE/PEEK
composite and an expanded PTFE (ePTFE)/epoxy coating. These experiments evaluate friction coefficient over a temperature span
which, to the investigators’ knowledge, has not been previously examined. Results show a monotonic increase in friction coefficient
as sample surface temperature was decreased from 317 to 173 K for all three samples. The frictional performance of these and
other published solid lubricant polymers was modeled using an adjusted Arrhenius equation, which correlates the coefficient
of friction of the polymer materials to their viscoelastic behavior. A model fit of all the polymer data from 173 to 450 K
gives an activation energy of 3.7 kJ/mol. This value suggests that breaking of van der Waals bonds is the likely mechanism
responsible for the frictional behavior over this temperature range. 相似文献
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为了研究聚四氟乙烯(PTFE)填充铜网复合材料的摩擦磨损性能以及细观损伤机制,使用往复摩擦磨损试验机对其进行全寿命磨损测试,并用扫描电子显微镜、光学显微镜和三维形貌仪对材料摩擦面及磨屑进行表征。结果表明:PTFE填充铜网复合材料全寿命(202 h)磨损过程主要分为磨合、稳定磨损和严重磨损3个阶段;在前20 h磨合阶段,摩擦因数逐渐升高,高载荷下大量的PTFE被挤出导致磨损率较大,同时转移膜生成,失效形式主要为机械剪切力下的剥落。在20~190 h稳定磨损阶段,摩擦因数先降低再升高且波动较大,磨损率趋于稳定,磨损机制主要为磨粒磨损,磨屑由层片状向粉末状转变,材料摩擦面粗糙度逐渐降低且磨损不均匀。通过微观表征,发现铜网编织结点与凸峰处磨损严重,通过受力仿真分析,发现铜网编织结点与凸峰处有应力集中现象,与试验中磨损严重的区域正好相对应,试验与数值模拟相关联。在190~202 h严重磨损阶段,摩擦因数和磨损量进一步升高,材料的耐磨性能与润滑性能急剧下降,最后材料被磨穿失效。 相似文献
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用机械共混、冷压成型自由烧结的方法制备了MoS2、CdO和聚全氟乙丙烯填充聚四氟乙烯复合材料;用MM-2000型摩擦磨损试验机测试了在干摩擦条件下该复合材料的摩擦磨损性能;用扫描电镜(SEM)对磨损试样的表面形貌进行观察和分析.结果表明:未添加聚全氟乙丙烯的复合材料其摩擦磨损性能比添加的好;当CdO的体积分数为22.5%,MoS2的体积分数为7.5%时,复合材料的摩擦因数最小,抗磨性强,复合材料的摩擦磨损性能最佳. 相似文献
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Al2O3纤维填充PTFE复合材料摩擦磨损性能分析 总被引:7,自引:1,他引:7
利用M-200型摩擦磨损试验机考察了填料含量及载荷对粉状Al2O3纤维填充PTFE复合材料摩擦磨损性能的影响,采用扫描电子显微镜观察分析磨损表面形貌及磨损机理。结果表明:Al2O3纤维填料可提高PTFE的硬度,从而可提高PTFE的耐磨性,但复合材料中Al2O3含量较高时会导致磨粒磨损,且AL2O3含量越高相应的磨粒磨损越严重。在本试验条件下,当Al2O3的质量分数为20%左右时,PTFE复合材料的耐磨性最佳;PTFE复合材料同钢对磨时的摩擦系数比纯PTFE大,且随Al2O3含量的增加而增大。 相似文献
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组合密封中塑料环的耐磨特性对其密封性能有重要作用,为优选合适对摩材料,研究超高分子量聚乙烯(UHMWPE)、聚四氟乙类(PTFE)+40%铜粉、PTFE+7%碳纤维、PTFE+7%碳纤维+5%MoS2、聚醚醚酮(PEEK)5种高分子聚合物材料与QT500对摩的微动摩擦磨损性能。从中筛选出PTFE+7%碳纤维、UHMWPE 2种材料进行不同微动行程、润滑条件下的对比试验。结果表明:无论是在干摩擦还是油润滑条件下,UHMWPE材料的平均摩擦因数随着微动行程的增大而增加,PTFE+7%碳纤维材料达到稳定状态时摩擦因数随着循环次数的波动较小。综合试验结果,当微动行程小于等于0.2 mm时建议选用PTFE+7%碳纤维,微动行程大于0.2 mm时建议选用超高分子量聚乙烯材料。 相似文献