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| Abstract: |
| Composite materials have attracted increasing attention to replace traditional materials such as metals for aerospace and automotive components due to their excellent mechanical and lightweight properties. By reinforcing with fillers, the material properties can be tailored to suit the needs of certain requirements. Nanofillers graphene oxide (GO) and silica (SiO2) are incorporated into carbon fibre/epoxy (CF/E) composites to enhance epoxy resin properties by impregnating into the weak area of resin and boosting the interaction forces between resin and filler interfaces. The mechanical, thermal, and morphological properties of GO and SiO2 fillers in the CF/E were investigated. Movever, after the exposure to distilled water and salt water, effect of moisture absorption on flexural and impact properties were investigated and the CF/E composite with hybrid nanofillers exhibited strong resistance to degradation in flexural and impact properties. FESEM images of the fracture surfaces indicated that the good performance of CF/E composite with bi-hybrid nanofillers originated from the synergistic GO and SiO2 nanofillers, which limit the motion of epoxy polymer molecular chain and give sufficient stress transfer ability to the composite system. The overall results showed that GO and SiO2 fillers can significantly enhance the mechanical properties as well as resistance to moisture environment. |
| Key words: composites nanofillers mechanical properties thermal analysis moisture absorption |
| DOI：10.11916/j.issn.1005-9113.18018 |
| Clc Number:TB332 |
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| Descriptions in Chinese: |
| 氧化石墨烯和二氧化硅纳米颗粒协同作用下的 复合材料力学性能改善 Anchalee Duongthipthewa, 杨树明*，王一鸣 （西安交通大学 机械制造系统工程国家重点实验室，西安 710049） 创新点说明：本文提出将氧化石墨烯和纳米二氧化硅颗粒组成的纳米复合材料作为填充物添加到环氧树脂/碳纤维复合材料体系中，用于提升其机械性能和湿润环境下的抗腐蚀性。 研究目的： 通过实验研究了氧化石墨烯和纳米二氧化硅颗粒组成的纳米复合材料作为填充物对环氧树脂/碳纤维复合材料体系的机械性能增强作用，以及在湿润环境下的抗腐蚀性。 研究方法： 本文通过真空辅助树脂传递模塑（VARTM）方法制备了环氧树脂/碳纤维复合材料样品，同时也通过该方法向复合材料体系中添加了不同分量的氧化石墨烯和纳米二氧化硅颗粒组成的纳米复合填料；通过三点弯曲测试、冲击实验、硬度测试和动态力学分析等方法对所制备样品的弯曲强度、冲击强度、硬度等机械性能进行了测量；通过分别在纯水和盐水中浸泡2周，对样品的吸湿性、烘干后的重量保留和性能保留进行了分析测试。 结果： 实验结果表明，对于添加了氧化石墨烯和纳米二氧化硅颗粒组成的纳米复合材料作为填充物的环氧树脂/碳纤维复合材料体系，其机械性能表现出全面的明显提升，包括弯曲强度、冲击强度、硬度等；纳米二氧化硅分量的提高还会使其性能得到进一步提升；对于含有复合纳米填充物的样品，其暴露在湿润环境中时虽然吸湿度较高，但烘干后重量损失反而较小，而且再次对其机械性能进行测试后发现其性能保留程度也较高；同样的，含有高分量纳米二氧化硅的样品性能表现最优。为探究其增强原理，通过扫描电子显微镜对样品断面进行了分析。 结论： 实验结果显示，复合填充物的存在使整个复合材料体系的机械强度得到提升，其根本原因在于复合填充材料的存在使环氧树脂与碳纤维骨架的结合更加紧密，在收到外力作用时应力得以迅速传递避免累积，扫描电子显微镜的结果也支持该结论。 关键词：复合材料，纳米填充，机械性能，热分析，吸湿性 |
