表面处理对碳纤织物增强环氧树脂复合材料界面及性能的影响

Influence of Surface Treatment on Interface and Performance for Carbon Fabric Reinforced Epoxy Resin Composite

为了探索提高衬层型重载摩擦副用碳纤织物增强聚合物自润滑复合材料使用性能的途径,采用微观分析与力学性能检测等手段,研究了碳纤织物不同表面处理方法(空气氧化、浓硝酸氧化、偶联剂涂覆、气液双效和液相双效处理)对碳纤及其复合材料界面和性能的影响。结果表明,与未处理的碳纤相比,表面处理后的碳纤比表面积增大/表面活性官能团升高,复合材料层间剪切强度得到显著提高;采用偶联剂涂覆处理具有较佳的综合效果,所制备的复合材料弯曲强度达1088.9 MPa,拉伸强度为538.1 MPa,压缩强度为551.3 MPa;冲击韧性为72.2 k J/m2。断口形貌分析表明,碳纤表面处理后有利于胶体均匀分布包覆于碳纤周围,从而使材料性能得到提高。

In order to improve the service performance of carbon fabric reinforced epoxy resin self-lubricating composite,the effect of different surface treatment methods( air oxidation treatment,HNO3 oxidation treatment,coupling agent coating,gas-liquid double treatment and liquid double treatment) on the interface and performance of carbon fiber and composite was studied by microscopic analysis and mechanical properties testing. The results show that the specific surface area / active functional groups of the carbon fiber after the different surface treatments are increased compared with those of the untreated specimen,which induce the significant improvement of the interlaminar shear strength. The optimized method for surface treatment is coupling agent coating treatment according to the integrated performance. The bending strength of the composite material with the carbon fabric treated by coupling agent coating is 1088. 9 MPa,the tensile strength of 538. 1 MPa,the compression strength of 551. 3 MPa and the impact toughness of 72. 2 k J / m2. According to the fracture morphology analysis,the enhanced performance could be attributed to the uniform colloids,which are evenly distributed around the carbon fabrics.