【摘要】 为了增韧纯环氧树脂基碳纤维复合材料，改善其力学性能，采用VARTM成型工艺制备二氧化硅改性碳纤维树脂基复合材料，借助傅里叶红外光谱仪、电子万能试验机、落锤式冲击试验机和SEM研究了改性后的环氧树脂官能团和化学键以及复合材料的拉伸、弯曲、冲击性能，并且对断口进行分析。结果表明：当纳米二氧化硅添加量为2%时，复合材料各项力学性能达到最佳，拉伸强度为620.216 4 MPa，断裂伸长率为0.551%，分别提高了88%、18.2%；弯曲强度和弯曲模量分别为1 169.230 1、77 069.625 0 MPa，相比未改性的复合材料提高了20.4%、97.6%；冲击韧性为63.82 kJ·m^-2，比纯环氧树脂碳纤维复合材料提高了25.4%。更多还原

【Abstract】 In order to toughen pure epoxy resin-based carbon fiber composites and improve their mechanical properties, VARTM molding process was used to prepare silica modified carbon fiber resin composites. By means of Fourier infrared spectrometer,electronic universal test machine, drop hammer impact test machine and SEM, the functional groups and chemical bonds of the modified epoxy resin and the tensile, bending and impact properties of the composite were studied. The results showed that the mechanical properties of the composites were the best, the tensile strength was 620.216 4 MPa and the elongation at break was 0.551%,which were increased by 88% and 18.2%, respectively, when the mass fraction of nano-silica was 2%. The bending strength and bending modulus were 1 169.230 1 MPa and 77 069.625 0 MPa respectively, which were increased by 20.4% and 97.6% compared with the unmodified composites. The impact toughness was 63.82 kJ·m^-2, which was 25.4% higher than that of pure epoxy carbon fiber composite.更多还原