CPR/NR和高性能填料对复合摩擦材料力学性能的影响

Impact of CPR/NR and High Performance Filler on Tribological Properties of Composite Friction Material

通过干法热压成型工艺制备性能优异的复合摩擦材料,研究了高性能填料以及改性酚醛树脂与丁腈橡胶质量比(CPR/NR)对复合摩擦材料性能的影响规律。对材料的摩擦磨损性能与力学性能进行了测试,借助热分析仪测试其耐热性能,并利用激光共聚焦显微镜、扫描电镜对表面形貌进行了观察和分析。结果表明,复合摩擦材料的密度、压缩强度、压缩模量、硬度随橡胶含量的减少而增加,冲击强度则呈相反的趋势。橡胶含量的减少,树脂比例的增加,使复合摩擦材料的耐热性得到提高,促进了第二接触面的形成,使摩擦系数与磨损率降低。高性能填料含量较低时,材料表面形成大且连续的第二接触面,第二接触面使摩擦系数、比磨损率降低,复合摩擦材料的主要磨损形式为粘着磨损与磨粒磨损;填料含量的增加会阻碍第二接触面的形成,使材料摩擦系数和比磨损率逐渐增大,材料的磨损形式由粘着磨损、磨粒磨损转变为磨粒磨损和疲劳磨损。

The high friction composite material was prepared by dry-hot molding process using the high performance filler as main filler.Then the influences of high performance filler and mass ratio of cashew oil modified phenolic resin to nitrile rubber on the properties of composite materials were discussed.The properties of high friction composites material were tested.And the heat resistance performance was analyzed by thermal analyzer.The surface morphology of composites were observed and analyzed by laser scanning confocal microscopy（LSCM）and scanning electron microscopy（SEM）.The results showed that the density,compressive strength,compressive modulus and hardness of the composites increase with the decrease of the rubber content,which is adverse to the impact strength.The reduction of rubber content facilitate to prompt heat resistance property,secondary contact areas,and to reduce friction coefficient and wear rate.Under a relatively low content of high performance filler,the large and continuous contact plateaus is formed on the surface of the material which causes the decrease of friction coefficient and wear rate were also reduced,and the main wear forms are adhesive wear and abrasive wear.The formation of secondary contact plateaus is hindered while the friction coefficient and specific wear rate gradually increases with the increase of filler content,and the main wear form of material transformed into abrasive and fatigue wear.