The epoxy nanocomposites with Fe₃O₄ modified graphene oxide (Fe₃O₄/GO) were used to influence the micro-cracks resistance of carbon fiber reinforced epoxy (CF/EP) laminate at 77 K. Fe₃O₄/GO with good paramagnetic properties were prepared by co-precipitation method and used to modify epoxy for cryogenic applications. Fe₃O₄/GO modified CF/EP laminates were also prepared through vacuum-assisted resin transfer molding (VARTM). The results show that the Fe₃O₄/GO can effectively improve the mechanical properties of epoxy (EP) matrix at 77 K and reduce the coefficient of thermal expansion (CTE) of EP matrix. It also can obviously improve the micro-cracks resistance of CF/EP composites at 77 K. Compared to neat EP, the CTE of Fe₃O₄/GO modified EP composite is decreased 51.6%. Compared to CF/EP composite, the micro-cracks density of Fe₃O₄/GO modified CF/EP composite at 77 K is decreased 60.0%.

Fe ₃ O ₄改性氧化石墨烯（Fe ₃ O ₄ / GO）的环氧纳米复合材料用于影响碳纤维增强环氧树脂（CF / EP）层压板在77 K时的抗微裂纹性。Fe ₃ O ₄ / GO与通过共沉淀法制备了良好的顺磁性能，并将其用于低温应用中的环氧改性。还通过真空辅助树脂传递模塑（VARTM）制备了Fe ₃ O ₄ / GO改性的CF / EP层压板。结果表明，Fe ₃ O ₄/ GO可以有效改善77 K下的环氧（EP）基体的机械性能，并降低EP基体的热膨胀系数（CTE）。它也可以明显提高CF / EP复合材料在77 K时的抗微裂纹性能。与纯EP相比，Fe ₃ O ₄ / GO改性EP复合材料的CTE降低了51.6％。与CF / EP复合材料相比，Fe ₃ O ₄ / GO改性的CF / EP复合材料在77 K时的微裂纹密度降低了60.0％。