纳米颗粒增强摩擦材料摩擦学性能研究

摘要

By employing phenolic resin modified by NBR as matrix, kevlar and glass fiber as reinforced fibers, different types of nanoparticles were selected to design the formula for the friction material, which was prepared by hot pressing sintering technology. The tribological properties of the materials were tested by the friction and wear testing machine under dry friction conditions, and the surface of friction materials was observed by scanning electron microscopy ( SEM), based on which the effect of different nanoparticles on friction material properties was studied. The result shows that under dry friction, the friction material modified by nanoparticles has a higher friction coefficient, hardness and a lower wear rate than the unmodified material. The friction coefficient and wear rate of materials modified by nanoparticles exhibit a trend, which decrease with the increase of test load and the sliding speed. The wear mechanism of modified materials is fatigue wear and abrasive grain wear. However, the wear mechanism of unmodified material is mainly fatigue wear.%以丁腈橡胶改性酚醛树脂为基体,芳纶纤维、玻璃纤维为增强纤维,选用不同类型的纳米颗粒作为填料设计摩擦材料组分配比,并通过热压烧结制备摩擦材料.通过摩擦磨损试验机测试其在干摩擦条件下的摩擦学性能,并用扫描电镜( SEM)对材料的磨损形貌进行观察分析,以研究不同类型的纳米颗粒对摩擦材料性能的影响.研究表明:在干摩擦条件下,经过纳米颗粒改性的摩擦材料摩擦系数、硬度比未改性的材料有不同程度的提高,同时磨损率有很大程度的降低;纳米颗粒改性的摩擦材料摩擦系数、磨损率变化趋势具有一致性,均随着实验载荷、滑动速度的增大而逐渐减小;纳米颗粒改性后的摩擦材料磨损机理表现为疲劳磨损与磨粒磨损并存,而未改性的材料磨损机理主要表现为疲劳磨损.