芳纶纱的结构形貌对芳纶/PTFE织物复合材料摩擦学性能的影响

为了研究纱线结构形貌对织物复合材料摩擦学性能的影响，选用对位芳纶纤维，制备成3种具有不同结构形貌的芳纶纱，分别为长丝平行纱、长丝加捻纱和短纤维加捻纱。以相同的制备工艺得到3种芳纶/PTFE织物复合材料，采用多试件摩擦磨损试验机测试复合材料的摩擦学性能，并对芳纶/PTFE混编织物及相应复合材料的结构形貌、力学性能和磨损表面进行分析与探讨。实验结果表明：芳纶纱的结构形貌可直接影响纱线的断裂强度、纱线拔出强力、纱线与树脂的界面结合力，进而影响织物复合材料的摩擦学性能；在不同的磨损条件下3种混编织物的耐磨性表现有所不同，当载荷相对较低时，芳纶短纤维加捻纱/PTFE织物复合材料磨损率更低，而当载荷较高时，芳纶长丝加捻纱/PTFE织物复合材料耐磨性更好。

Effect of Structure and Morphology of Aramid Yarn on the Tribological Properties of Aramid/PTFE Fabric Composites

In order to study the effect of yarn structure and morphology on the tribological properties of fabric composites,three kinds of aramid yarns with different structure and morphology were prepared from para-aramid fiber,namely filament parallel yarn,filament twisted yarn and short fiber twisted yarn.Three kinds of aramid/PTFE fabric composites were prepared by the same process.The tribological properties of the composites were evaluated by multi-specimen test machine.The structure and morphology,mechanical properties and tribological properties of aramid/PTFE hybrid fabrics and corresponding composites were analyzed.The experimental results show that the structure and morphology of aramid yarn can affect the tribological properties of aramid/PTFE fabric composites.This is because the structure and morphology of aramid yarn directly change the yarn strength,the yarn pull-out strength,and the interfacial bonding force with the resin.The abrasion resistance of the hybrid fabrics varies with wear conditions.When the load is relatively low,the wear rate of aramid short fiber twisted yarn/PTFE fabric composite is lower,while when the load is higher,the abrasion resistance of aramid filament twisted yarn/PTFE fabric composite is better.