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- 2017
碳纳米管有序排列对碳纤维增强环氧树脂基复合材料低温性能的影响
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Abstract:
为了提高碳纤维增强环氧树脂（CF/EP）复合材料在低温（77 K）循环条件下的抗微裂纹性能，采用共沉淀法制备了具有良好顺磁性的Fe3O4修饰氧化碳纳米管（Fe3O4-O—MWCNTs），并研究了Fe3O4-O—MWCNTs在环氧树脂（EP）基体中的有序排列对EP及CF/EP复合材料低温性能的影响。结果表明：Fe3O4-O—MWCNTs的有序排列可有效提高EP基体的低温力学性能及降低EP基体的热膨胀系数，相对于纯EP，Fe3O4-O—MWCNTs改性EP的热膨胀系数降低了41.6%；相对于CF/EP复合材料，Fe3O4-O—MWCNTs改性CF/EP复合材料在低温环境下的微裂纹密度降低了56.2%。 In order to improve the micro-cracks resistance of carbon fiber reinforced epoxy (CF/EP) at cryogenic temperature (77 K), Fe3O4 modified O-MWCNTs (Fe3O4-O-MWCNTs) with good paramagnetic properties were prepared by co-precipitation method. The effects of the addtions of aligned Fe3O4-O-MWCNTs on the properties of epoxy (EP) and CF/EP composites at 77 K were studied. The results show that the aligned Fe3O4-O-MWCNTs can effectively improve the mechanical properties of EP matrix at 77 K and reduce the coefficient of thermal expansion (α) of EP matrix. It can also obviously improve the micro-crack resistance of CF/EP composites at 77 K. Comparing to the neat EP, α of aligned Fe3O4-O-MWCNTs modified EP composite decreases by 41.6%. Comparing to CF/EP composite, the micro-crack density of aligned Fe3O4-O-MWCNTs modified CF/EP composite at 77 K decreases by 56.2%.
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