煅烧石油焦及六方氮化硼对摩阻材料摩擦磨损性能的影响

Effect of hBN and Calcined Petroleum Coke on Friction and Wear Properties of Phenolic Resin-based Friction Composites

在酚醛树脂基摩阻材料中分别添加煅烧石油焦（CPC）及六方氮化硼（hBN）作为摩擦改性剂，研究了2种摩擦改性剂对酚醛树脂基摩阻材料的力学性能和摩擦磨损性能的影响，通过热失重试验分析了复合材料的耐温性能，并利用扫描电子显微镜观察复合材料的磨损表面形貌．结果表明：当hBN体积分数为10％～15％时，摩阻材料与树脂基体的粘接强度最强且能够明显降低复合材料的硬度，有助于在摩擦界面生成均匀牢固的润滑膜而起到降低磨损率、稳定摩擦系数的作用；当hBN体积分数超过15％时，由于hBN过饱和及其与树脂基体的相容性差，导致摩阻材料机械强度下降，磨损率增大；随着CPC含量增加，摩阻复合材料的机械强度增加，摩擦磨损性能降低；CPC和hBN的体积分数为12％时能够不同程度地提高摩阻材料的耐温性能及降低其对速度和载荷的敏感性，且含12％hBN摩阻材料的热稳定性最佳，其摩擦磨损性能对速度和载荷的敏感性最小，

Calcined petroleum coke （CPC） and hexagonal boron nitride （hBN） used as the friction modifiers were filled into phenolic resin-based friction composites. Effects of the friction modifiers on mechanical and tribological properties of friction composites were investigated. Thermal stability of the friction composites was analyzed by means of thermogravimetric analysis （TGA）. Worn surfaces of friction composites were examined with a scanning electron microscope to examine wear mechanism of the composites. It was found that inclusion of hBN of at volume fraction 10%-15% contributed to increase the bonding strength and decrease the hardness of the friction composites, and to stabilize the friction coefficient and improve wear resistance of the friction composites. With increase of CPC, mechanical strength of the friction composites increases, while its friction coefficient and wear rate decreased. Incorporation of 22%CPC and 22%hBN is useful to decrease speed and load sensitivity on friction and wear and to improve heat-resistance of the friction composite. 22%hBN filled friction composite had the best thermal stability and the smallest speed and load sensitivity on friction and wear as well.