纳米氧化铝掺杂酚醛/环氧聚合物基复合材料的制备及耐磨性能

目的 提高环氧树脂的耐磨性并改善其力学性能，探究纳米氧化铝掺杂酚醛/环氧复合材料的摩擦磨损行为并揭示其减摩耐磨机制。方法 以酚醛树脂(PF)改性环氧树脂(EP)为聚合物基体，将改性的纳米氧化铝(Nano-Al₂O₃)掺杂其中，制备不同配比的Nano-Al₂O₃掺杂PF/EP聚合物基复合材料。利用红外光谱仪(FTIR)对复合材料进行化学结构表征。通过泰伯磨损试验和硬度分析，对比不同含量Nano-Al₂O₃掺杂对PF/EP基复合材料耐磨性能的影响。借助扫描电镜(SEM)分析复合材料的断面形貌和磨损表面，探究复合材料的磨损机理和减摩耐磨机制。结果 FTIR测定证实了硅烷成功改性Nano-Al₂O₃，并参与到PF与EP的固化反应中。硬度分析及磨损试验表明，硅烷改性Nano-Al₂O₃和PF的加入都提高了复合材料的硬度和耐磨性。与纯EP相比，酚醛质量分数为30%，掺杂3%Nano...

Preparation and Wear Resistance of Nano-Al2O3 Doped PF/EP Polymer Matrix Composite

The work aims to improve the wear resistance and mechanical properties of epoxy resin (EP), explore the friction and wear behavior of nano alumina (Nano-Al2O3) doped phenolic resin (PF)/epoxy resin (EP) composite, and reveal its wear reduction and resistance mechanism. Nano-Al2O3 was surface treated with KH550 silane coupling agent to obtain modified Nano-Al2O3, and then PF was used to cure modified EP as the polymer matrix. In the preparation method of blending, the modified Nano-Al2O3 was doped into the polymer matrix to prepare Nano-Al2O3 doped PF/EP polymer matrix composites with different ratios. The chemical structures of silane modified Nano-Al2O3, PF/EP polymer and composite were characterized by infrared spectroscopy (FTIR). The effect of PF on the wear resistance and hardness of EP based polymer was studied by Taber wear test and hardness analysis. The tribological properties of PF/EP based polymer composites with different contents of Nano-Al2O3 were compared. Scanning electron microscopy (SEM) was used to analyze the cross-section morphology of the composite and the distribution of Nano-Al2O3 in the matrix of the composite. The wear surface of EP, PF/EP polymer and composite was analyzed, and the wear mechanism and wear reduction mechanism of the composite were investigated. FTIR assay confirmed the successful modification of Nano-Al2O3 with silane, which was involved in the curing reaction of PF and EP. The results of hardness analysis and Taber wear test indicated that the addition of silane modified Nano-Al2O3 and PF improved the hardness and wear resistance of the composite. Compared with pure EP, the composite with 30wt.% phenolic content and 3wt.% Nano-Al2O3 doping had the lowest Taber wear index and the least wear weight loss, of which the hardness was increased by 86%, the wear weight was reduced by 38.7%, and the comprehensive performance was the best. The SEM results showed that the modified Nano-Al2O3 was bound well to the PF/EP polymer matrix, and the silver streaks generated by the fracture surface and the uniformly dispersed Nano-Al2O3 improved the toughness and compactness of the composite. The wear surface of Nano-Al2O3 doped composite was flatter than that of EP and PF/EP polymers. PF and EP were linked by covalent bonds to form macromolecular chains. The cross-linking of polymer chains restricted the movement of Nano-Al2O3 and reduced the shedding of modified Nano-Al2O3 during friction. Nano-Al2O3 was embedded into the network structure formed by curing, which improved the cohesion and bearing capacity of the composite. On the other hand, the shed Nano-Al2O3 filled the micropores and defects on the corresponding surface, and the formed lubricating film and the self-lubricating properties of the polymer improved the wear resistance of the composite. The excellent tribological properties of the composite are attributed to the synergistic effect of strong microhardness and lubricating film. The comprehensive analysis shows that the Nano-Al2O3 doped PF/EP polymer matrix composites prepared in this experiment are helpful to extend the current tribology research of polymer/nano-composite materials. At the same time, the improvement of polymer matrix and the introduction of reinforcement materials are considered, which is of great significance for the design of polymer/nano-composites.