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为了增强超高分子量聚乙烯(UHMWPE)的性能,研究采用表面改性的Ti_3AlC_2填充UHMWPE,通过热压成型制备了Ti_3AlC_2/UHMWPE复合材料。采用SEM观察复合材料的微观结构,表明Ti_3AlC_2均匀分散在UHMWPE基体中,表面处理后的填料与基体界面熔合较好;热分析结果表明,Ti_3AlC_2的添加降低了UHMWPE的结晶度和结晶热焓,同时提高了聚合物的热传导性;DMA分析结果表明,添加Ti_3AlC_2有效地提高了Ti_3AlC_2/UHMWPE复合材料的抗蠕变性能,得益于无机粒子改善了复合材料的硬度和刚性,提高了复合材料抗外界应力变形能力;摩擦学性能分析表明,适量的Ti_3AlC_2(质量分数≤15wt%)填充UHMWPE能有效提高复合材料的减磨抗摩性能,同时磨痕表面形貌分析结果表明,Ti_3AlC_2/UHMWPE复合材料的摩擦磨损机制由粘着磨损向磨粒磨损转变。
In order to enhance the properties of ultrahigh molecular weight polyethylene (UHMWPE), the UHMWPE filled with Ti_3AlC_2 with surface modification was studied and the Ti_3AlC_2 / UHMWPE composites were prepared by hot press forming. The microstructure of the composites was observed by SEM. The results showed that Ti_3AlC_2 was uniformly dispersed in the matrix of UHMWPE. The interface between the surface treated filler and the matrix was better. The thermal analysis showed that the addition of Ti_3AlC_2 reduced the crystallinity and enthalpy of crystallization of UHMWPE. The results of DMA analysis showed that the addition of Ti_3AlC_2 effectively enhanced the creep resistance of Ti_3AlC_2 / UHMWPE composites. The inorganic particles improved the hardness and rigidity of the composites, The results of tribological properties show that the proper amount of Ti_3AlC_2 (mass fraction≤15wt%) filled UHMWPE can effectively improve anti-friction and anti-friction properties of the composite. The results of surface morphology analysis show that the wear resistance of Ti_3AlC_2 / UHMWPE composites Friction and wear mechanisms change from adhesive wear to abrasive wear.