三维编织碳/环氧复合材料的摩擦学特性

Tribological Properties of 3D Braided Carbon Fiber/Epoxy Composites

为研究三维编织复合材料的摩擦学行为,采用RTM工艺制备了三维编织碳纤维增强环氧树脂复合材料, 讨论了纤维体积比、纤维表面处理和润滑条件等因素对复合材料摩擦磨损性能的影响.结果表明,随着纤维含量的增加,复合材料的摩擦系数先降后升,在35%时有最小值;磨损率则一直下降.纤维表面处理使复合材料的磨损率降低,耐磨性提高.水润滑条件下复合材料的摩擦磨损性能远优于干摩擦条件下的性能.干摩擦条件下复合材料的磨损机制主要为黏着磨损,水润滑条件下则以磨粒磨损为主.

An epoxy-based composite reinforced with three-dimensionally braided carbon fibers （C3D/EP） was prepared by resin transfer molding （RTM） process. The tribological behaviors of C3D/EP composites were studied using a ring-on-block tester. The effects of fiber volume fraction （Vf） , fiber surface treatment and water lubrication on the friction and wear properties of C3D/EP composites were discussed. The worn surfaces were observed and analyzed with a scanning electron microscopy （SEM）. The results show that with the increase of Vf, the friction coefficient of the composite decreases initially, reaches a minimum when Vf = 35%, and then in- creases slightly,while the wear rate drops consistently. The wear resistance of C3D/EP composites with treated fibers is better than those with untreated fibers. It＇s believed that the main wear mechanism is adhesive under dry friction, while abrasive with water lubrication, and the friction and wear performances of the composites are greatly improved with water lubrication.