碳纤维表面协同改性对纸基摩擦材料力学和摩擦学性能的影响

Effect of Surface Synergistic Modification of Carbon Fiber on Mechanical and Tribological Properties of Paper-based Friction Material

关键词:  碳纤维  纸基摩擦材料  协同改性  力学性能  摩擦学性能

Key Words:carbon fiber  paper-based friction material  synergistic modification  mechanical performance  tribological property

摘要:本研究分别采用多巴胺-端环氧基硅油与硝酸-端环氧基硅油体系改性碳纤维，对比了纤维表面形貌和化学官能团的变化，探究了化学协同改性机理。进一步表征了纸基摩擦材料的表面形貌、粗糙度及孔隙结构，研究了协同改性对纸基摩擦材料力学和摩擦学性能的影响规律。结果表明，硝酸-端环氧基硅油改性体系更有利于提升纸基摩擦材料力学强度和耐磨性，改性后纸基摩擦材料的拉伸强度和层间剪切强度分别较改性前提高了25.8%和23.6%，磨损率降至0.620×10^-8 cm³/J；相比于多巴胺预处理，硝酸刻蚀过程不仅可以增加后续端环氧基硅油接枝改性的活性位点，同时提高了碳纤维与树脂间的化学交联密度。

Abstract:The synergistic strategies including dopamine-epoxy-terminated silicone oil and nitric acid-epoxy-terminated silicone oil were employed， respectirely， to modify the carbon fibers in this study. The surface morphology and chemical functional groups of fibers were characterized and compared. The mechanism of chemical synergistic modification was further explored. In addition， the surface microstructure， roughness and pore structure of paper-based friction material were also described. The effect mechanism of synergistic modification on the mechanical and tribological properties of paper-based friction material was further studied. The results showed that the synergistic strategy of nitric acid-epoxy-terminated silicone oil was more conducive to improve mechanical properties and wear resistance of paper-based friction materials.Compared with unmodified paper-based friction material， the tensile and interlaminar shear strength of modified paper-based friction materials were increased by 25.8% and 23.6%， respectively， and wear rate decreased to 0.620×10^-8 cm³/J. Compared with dopamine pretreatment， the nitric acid etching process could not only provide more active sites for the subsequent grafting modification of epoxy-based silicone oil， but also increase the chemical crosslink density between carbon fibers and the resin.