成型工艺对树脂基摩擦材料及其摩擦学性能的影响

以碳纤维2.5D浅交弯联结构为预制体,分别采用树脂传递成型工艺(RTM)和热压成型工艺(HPM)制备了碳纤维增强酚醛树脂基摩擦材料.通过MS-T3001摩擦磨损试验机考核了材料的摩擦磨损性能,采用扫描电子显微镜、激光三维形貌扫描仪观测了材料的磨损形貌,对比分析了两种成型工艺对材料摩擦学性能的影响.结果表明:随着滑动速度和工作载荷的增大,材料的摩擦系数均减小.热压成型工艺成型摩擦材料的主要磨损形式为磨粒磨损,摩擦系数0.085~0.130,磨损率1.5×10-8 g·N-1·m-1.树脂传递成型工艺成型摩擦材料的主要磨损形式为黏着磨损和疲劳磨损,摩擦系数0.075~0.120,磨损率7.5×10-8 g·N-1·m-1. 

Effect of molding process on tribological characteristics of friction materials based on resin

Resin transfer molding (RTM) and hot-pressing molding (HPM) were used to prepare phenolic resin matrix composites reinforced by carbon fiber. The tribological properties of the materials were tested using a MS-T3001-type friction and wear tester. A scanning electron microscopy and three-dimensional laser microscopy were used to analyze the superficial microstructure of the friction materials. Furthermore, a comparative analysis was employed to investigate the influences on the tribological properties by two types of material-forming processes. Results indicate that the friction coefficient decreases with increased relative sliding speed and workload. For the RTM friction material, the main form of wear is adhesive wear and fatigue wear, the coefficient of friction is 0.075-0.120, and the wear rate is 7.5×10-8 g·N-1·m-1. In contrast, for the HPM friction material, abrasive wear is the main form of wear, and the friction coefficient and wear rate are 0.085-0.130 and 1.5×10-8 g·N-1·m-1, respectively.