SiCp增强铝基复合材料与Kevlar增强摩擦材料摩擦副摩擦磨损机理研究

Wear Mechanisms of Kevlar Pulp Reinforced Friction Materials

采用盘销式摩擦磨损试验机,对SiCp含量为20vol％的铝基复合材料和Kevlar增强摩擦材料组成的摩擦副在干摩擦条件下的摩擦磨损机理进行了实验研究。结果表明:摩擦副在跑合过程中,铝基复合材料中的SiCp颗粒对较软的有机复合材料产生犁削和微观切削效应,磨损机理为铝基复合材料的硬质颗粒对较软的有机复合材料的磨粒磨损;在跑合后的磨损试验中,摩擦材料磨损表面呈现出粘着磨损和塑性变形特征,随着转动速度的增加,塑性流动加剧;摩擦副接触表面发生材料的相互转移,并在铝基复合材料表面形成转移膜,且在较高速度下转移膜更易形成;在高速条件下,摩擦材料表面可见从铝基复合材料的铝合金基体中脱离的SiCp颗粒和熔融迹象;摩擦材料的磨损机理主要为磨粒磨损、粘着磨损和塑性变形。

The wear mechanisms of SiC particle (SiCp) reinforced aluminum composite and Kevlar fiber reinforced phenolic resin frictional material under braking condition were investigated with disc-pin friction and wear tester. The morphologies and compositions of worn surface were observed and determined using scanning electron microscope and energy depressive X-ray analysis. As the results, the frictional material surface were ploughed and micro-cut by the SiC particle during running-in process. After then, signs of adhesion wear and plastic deformation on the worn frictional material surface, which is accelerated at higher speed, were observed. The inter-transfer between frictional material and SiCp reinforced aluminum composite is also observed and a transfer films of the frictional material is formed on the counterpart surface. It is easier for the transfer films of the frictional material to form with higher sliding speed. Accompanied by localized melting, some SiC particles are found on the worn frictional material surface under high sliding speed condition. The frictional material is characterized by slight scuffing, adhesion and plastic deformation, in sliding against the SiCp reinforced aluminum composite.