改性纳米Si_3N_4/环氧树脂复合材料的摩擦磨损特性

研究纳米氮化硅粒子(Si3N4)填充环氧树脂复合材料的滑动干摩擦磨损特性,着重探讨纳米粒子表面接枝共聚改性、粒子含量对复合材料摩擦磨损性能的影响。通过对复合材料磨损表面的粗糙度及形貌分析探讨复合材料的磨损机理。结果表明,纳米氮化硅粒子能在很低的含量下(0.18%(体积分数,下同))显著提高环氧树脂的耐磨性、并降低其摩擦系数,而经过接枝共聚改性的纳米Si3N4粒子填充的复合材料的上述性能改善更为明显,耐磨性比Si3N4/EP提高3倍,摩擦系数降低20%。这说明,在Si3N4纳米粒子表面进行接枝共聚后,有利于加强粒子与基体的界面结合,从而改善复合材料的摩擦学性能。

Tribological Performance of Modified Nano-Si3N4/EP Composites

The dry sliding friction and wear properties of nano-Si3N4 particles filled epoxy composites were investigated,with an emphasis on exploring the effect of the surface modification via graft copolymerization and the filler content on the tribological behaviors of the composites.Based on the morphological observation and the roughness measurement of the worn surface of composites,the possible wear mechanism was discussed.The results indicate that the addition of low loading (0.18%) Si3N4 nanoparticles can significantly decrease the specific wear rate and frictional coefficient of epoxy resin.Much lower wear rate and frictional coefficient of the composites were observed when surface modified nanoparticles were used.The specific wear rate of the composites is 3 times lower than that of Si3N4/EP composites and the frictional coefficient is decreased by 20%.It means that the grafting copolymer introduced onto the Si3N4 nanoparticles enhance the interfacial adhesion,leading to improve tribological properties of the composites.