【摘要】 为增强纳米二氧化硅（SiO₂）改性超高分子量聚乙烯（UHMWPE）的耐磨性与防滑性，使用碳纤维（CF）和纳米SiO₂对UHMWPE复合材料进行改性。利用RTEC多功能摩擦磨损试验机，开展改性UHMWPE复合材料水润滑条件下的摩擦磨损试验，通过对比分析添加不同改性材料的UHMWPE复合材料的力学性能、接触角、摩擦因数、磨损表面元素组成，以及磨痕轮廓和微观形貌等，揭示不同体积分数CF对复合材料防滑性能的影响机制。结果表明：CF体积分数的增加促进了摩擦过程中摩擦表面更多的CF暴露和堆积，增加了复合材料的表面粗糙度，使得复合材料的接触角明显增大，疏水性能提升；同时复合材料界面结合强度增强，接触面积增大，进而摩擦因数增大，体积分数4%CF协同纳米SiO₂改性的UHMWPE复合材料的平均摩擦因数达到0.223，提升了66%；随着CF体积分数提高，复合材料的硬度、拉伸强度、弯曲强度和撕裂强度均得到提升，从而有效改善了其耐磨性能，CF体积分数为5%时，磨损率相比未添加CF的复合材料降低了55.3%。CF/SiO₂/UHMWPE复合材料的力学性能与摩擦学性能均得到提升，其防滑耐磨性能获得增强，为设计具有优异防滑、耐磨损性能的复合材料提供参考。更多还原

【Abstract】 To enhance the wear resistance and anti-slip properties of nano-silica（SiO₂） modified ultra-high molecular weight polyethylene（UHMWPE）,carbon fiber（CF） and nano-SiO₂ were used to modify UHMWPE composite materials. Utilizing the RTEC multifunctional friction and wear testing machine,friction and wear tests were conducted on modified UHMWPE composites under waterlubricated conditions. By comparing and analyzing the mechanical properties,contact angle,friction coefficient,wear surface elemental composition,as well as the wear scar profile and micro-morphology of UHMWPE composites with different modified materials,the mechanism of different volume fractions of CF on the anti-slip performance of the composites was revealed. The results show that an increase in CF volume fraction promotes more CF exposure and accumulation on the friction surface during the friction process,which increases the surface roughness of the composite,resulting in a significant increase in the contact angle of the composites and improves hydrophobic performance. At the same time,the interfacial bonding strength of the composite is enhanced,and the contact area increases,thereby increasing the friction coefficient. The average friction coefficient of the UHMWPE composite modified with volume fraction 4% of CF and nano-SiO₂ reaches 0. 223,an increase of 66%. As the CF volume fraction increases,the hardness,tensile strength,bending strength,and tear strength of the composite are all improved,effectively enhancing its wear resistance. When the CF volume fraction is 5%,the wear rate is reduced by 55. 3% compared to the composite without added CF. The mechanical and tribological properties of the CF/SiO₂/UHMWPE composites are enhanced,leading to improved anti-slip and wear-resistant performance. This provides a reference for the design of composites with excellent anti-slip and wear-resistant properties.更多还原