改性碳纤维增强纸基摩擦材料摩擦磨损性能

采用双-γ-(三乙氧基硅基)丙基]四硫化物(Si69)和乙烯基三乙氧基硅烷(A151)对PAN基碳纤维(CF)进行表面改性处理,利用SEM、FTIR、EDX对改性前后的CF进行表征,测量接触角和表面能、力学性能和界面性能;通过湿法成形技术,制备不同改性CF增强聚酰亚胺纸基摩擦材料,并测试其孔隙率和摩擦学性能。结果表明:与未改性CF相比,Si69和A151能够有效地增加CF表面粗糙度,且新基团的引入使接触角变小,提高了CF表面活性,改善了纤维与树脂之间的结合力,使得A151-CF表面能增加了37.3%,Si69-CF表面能增加了109.4%,A151-CF/聚酰亚胺复合材料界面性能增加了19.1%,Si69-CF/聚酰亚胺复合材料界面性能提高了45.3%;相比未改性CF,Si69改性CF使纸基摩擦材料孔隙率下降了20.2%,A151改性CF使纸基摩擦材料孔隙率下降了8.8%;表面改性CF能够提高纸基摩擦材料的摩擦学性能,其中Si69改性CF增强纸基摩擦材料摩擦学性能优于A151改性CF增强纸基摩擦材料。

Friction and Wear Properties of Modified Carbon Fiber Reinforced Paper-based Friction Materials

The surface modification of pan-based carbon fiber(CF) was carried out by using bis-(γ-triethoxysilylpropyl)-tetrasulfide(Si69) and triethoxyvinylsilane(A151).The CF before and after modification was characterized by using SEM,FTIR and EDX,and the contact angle and surface energy,mechanical properties and interfacial properties were measured.By means of wet forming technology,different modified CF reinforced polyimide paper-based friction materials were prepared,and their porosity and tribological properties were tested.The results show that compared with unmodified CF,Si69 and A151 can effectively increase the surface roughness of CF.The introduction of new groups reduces the contact angle,improves the surface activity of CF,and improves the binding force between fiber and resin.So the surface energy of A151-CF is increased by 37.3%,the surface energy of Si69-CF is increased by 109.4%,and the interfacial property of A151-CF/polyimide composites is increased by 19.1%.Compared with unmodified CF,the porosity rate of paper-based friction materials is decreased by 20.2% by Si69 modified CF and 8.8% by A151 modified CF.The modified CF can improve the tribological properties of paper-based friction materials,and the tribological properties of Si69 modified CF reinforced paper-based friction materials are better than that of A151 modified CF reinforced paper-based friction materials.