【摘要】 采用电子万能试验机、M-2000型摩擦试验机、电子和光学显微镜等测试分析方法，重点考察了纳米二氧化硅（nano-SiO₂）及其与聚酰胺6（PA6）复合对超高分子量聚乙烯（PE-UHMW）摩擦磨损性能的影响。结果表明，随着nano-SiO₂用量的增加，PE-UHMW复合材料的摩擦因数和磨损率均呈现出先降低后升高的趋势；当nano-SiO₂含量为2%时，复合材料具有最低的摩擦因数和磨损率；在nano-SiO₂含量为2%基础上添加8%的PA6时，复合材料表现出更低的摩擦因数和磨损率，分别为0.29和0.33×10^-9g/（N·m）；添加nano-SiO₂有效抑制了PE-UHMW的黏着磨损和塑性变形，适量nano-SiO₂和PA6复合改性PE-UHMW形成了更加均匀致密的自润滑转移膜，磨损面变得更加平整光滑，表现为非常轻微的磨粒磨损特征。更多还原

【Abstract】 The effects of nano-SiO₂ and its composites with polyamide 6 on the tribological properties of ultra-high molecular weight polyethylene（PE-UHMW）were investigated using electronic universal testing machine,M-2000 friction testing machine,electron and optical microscope.The results indicate that the friction coefficient and wear rate of PE-UHMW composites decreased at first and then tended to increase with an increase in the nano-SiO₂ content.The composites exhibited the lowest friction coefficient and wear rate at a nano-SiO₂ content of 2 wt%.When 8 wt%polyamide 6 was added into the PE-UHMW composite containing 2 wt%nano-SiO₂,the composites obtained a low friction coefficient of 0.29 and a low wear rate of 0.33×10^-9g/（N·m）.The wear mechanism analysis indicated that the addition of nano-SiO₂ could effectively inhibit the adhesive wear and plastic deformation of PE-UHMW,and PE-UHMW composite with appropriate nano-SiO₂ and polyamide 6 can form a more uniform and compact self-lubricating transfer film,and the wear surface becomes more smooth and present a very slight abrasive wear characteristics.更多还原