PI/Fe_(2)O_(3)@CF复合材料的制备及摩擦学性能

Preparation and Tribological Properties of PI/Fe_(2)O_(3)@CF Composites

在碳纤维(CF)的表面修饰Fe_(2)O_(3)纳米颗粒,以聚酰亚胺(PI)树脂为基体制备了PI/Fe_(2)O_(3)@CF复合材料。利用X射线衍射仪和扫描电子显微镜对CF的结构和形貌进行了分析;利用热重分析仪和导热仪考察了复合材料的耐热和导热性能;利用万能试验机和摩擦磨损试验机测试复合材料的力学性能和摩擦学性能。研究结果表明,Fe_(2)O_(3)有效提高了CF与聚合物基体之间的结合强度,进而提高了复合材料的力学性能和摩擦性能,并且复合材料的耐热和导热性能也有所提高。当Fe_(2)O_(3)@CF质量分数为15%时,PI/Fe_(2)O_(3)@CF复合材料的拉伸强度达到111 MPa,摩擦系数和体积磨损率(滑动速度0.572 m/s,载荷120 N条件下)分别比纯PI降低了18.9%,51.9%;当滑动速度和载荷变化时,PI/Fe_(2)O_(3)@CF复合材料的摩擦性能均优于纯PI,可以适用于不同的工况条件。

The polyimide(PI)/Fe_(2)O_(3)@CF composites were prepared by modifying Fe_(2)O_(3)nanoparticles on the surface of carbon fiber(CF)and using PI resin as matrix.The structure and morphology of CF were analyzed by X-ray diffraction and scanning electron microscope.The heat resistance and thermal properties of the composites were investigated by thermogravimetric analysis and thermal conductivity tester.The mechanical and tribological properties of composites were tested by universal testing machine and friction and wear testing machine.The results show that Fe_(2)O_(3)can effectively improve the bond strength between CF and matrix,improve the mechanical properties,heat and thermal conductivity of the composite.And the friction coefficient can be reduced and the wear resistance can be improved.When the content of Fe_(2)O_(3)@CF is 15%,the tensile strength of the composite is 111 MPa.Compared with pure PI,the friction coefficient and volume wear rate(sliding speed:0.572 m/s,load:120 N)are reduced by 18.9%and 51.9%respectively.When the sliding speed and load change,the friction performance of PI/Fe_(2)O_(3)@CF is better than that of pure PI,which can be applied to different working conditions.