SiCp/AZ91D纳米复合材料的摩擦磨损行为研究

Study on Friction and Wear Behavior of SiCp/AZ91D Nanocomposites

摘要:

采用机械搅拌与高能超声处理法制备了纳米SiC颗粒(n-SiCp)增强的镁基复合材料，探讨了基体及其复合材料的干滑动摩擦磨损行为。结果表明：由于纳米颗粒的强化作用，复合材料的耐磨性能要明显的强于基体，随着载荷的增加，基体和复合材料的磨损率线性增加，在磨损过程中，基体和复合材料经过磨合磨损和稳态磨损两个阶段。通过对磨损表面的显微分析发现, 磨损机制主要是粘着磨损、磨粒磨损和剥层磨损，载荷大小对磨损机制有重要影响。

Abstract:

Magnesium matrix nanocomposites reinforced with nano-sized SiC particles (n-SiCp) were fabricated by mechanical stirring and high intensity ultrasonic dispersion processing. The dry sliding friction and wear behavior of the magnesium alloy and its nanocomposites were investigated. The results show that the wear resistance of the nanocomposites is higher than that of pure AZ91D alloy due to the nanoparticles reinforced effects. The wear rate increases linearly with the increase of the load for the matrix and its nanocomposites. The wear process of the matrix and the nanocomposites consists of two stages, i.e. running and stable wear stages. The SEM and LSCM analysis results on the worn surface indicate that the main wear mechanism is adhesive wear, abrasive wear and delamination wear. The load has an important effect on the wear mechanism.