芳纶纤维织物摩擦磨损性能的研究

Study of the Tribological Properties of Kevlar Fabric

用ＭＭ－２００型摩擦磨损试验机考察了不同条件下芳纶纤维织物的摩擦学性能，并用扫描电子显微镜和Ｘ射线衍射仪对纤维织物的磨损表面、磨屑形貌及结晶性进行了观察和分析．结果表明：随着负荷的增大，织物的摩擦系数略有降低，磨损呈上升趋势；速度对织物的摩擦学性能影响不大；纤维束的挤压变形和磨屑的填充作用导致磨损表面被压实并变得光滑，从而使真实接触面积增大，摩擦条件改善．２５０℃处理后织物中的纤维强度降低，因而磨损增大．

The variations in the tribological properties of Kevlar fabric with various conditions (load, sliding speed, and heat treatment) were studied using a ring on block tester. The worn surface morphology and the crystallinity of Kevlar fabric were analyzed by means of scanning electron microscopy (SEM) and X ray diffraction (XRD). It was found that with load increasing,the friction coefficient of Kevlar fabric sliding against AISI1045 steel decreased and the wear scar width increased obviously. After heat treatment at 250 ℃ the wear of Kevlar fabric increased to some extent. SEM analysis showed that the wear debris entrapped in the gap among the fibers of Kevlar fabric restrained further wear. The changes in the wear debris morphology and the increase in the wear scar width were also observed for the heat treated Kevlar fabric.This could be due to the decrease in the strength of the fabric after heat treatment.