Ma Yuqin, Li Fei, Xu Wei, Zhang Yuyang, Xu Yi, Guo Haiyin, Li Yatao
State Key Laboratory of Public Big Data, Guizhou University, Guiyang 550025, China.
Key Laboratory of Road Construction Technology and Equipment of MOE, School of Construction Machinery, Chang'an University, Xi'an 710064, China.
Nanomaterials (Basel). 2022 Oct 30;12(21):3839. doi: 10.3390/nano12213839.
Graphene oxide-carbon fiber/epoxy (GO-CF/EP) composites with extrusion temperatures of 30, 40, 50, 60 and 70 °C were prepared by a vacuum infiltration hot-press-forming experimental system (VIHPS). The effects of extrusion temperature on the microstructure, fracture mechanism and mechanical properties of GO-CF/EP composites were investigated. It was found that the best mechanical property of composites and infiltration effect of the matrix in the fiber gap were obtained at the temperature of 50 °C, and the bending strength of the composite reached 728 MPa. The fiber was pulled out and broken under the wrapping of the matrix. The matrix viscosity was high, and the fluidity was poor when the extrusion temperature was low. The poor infiltration of the matrix resulted in many fibers failing to bond together, resulting in the disorderly breakage of fiber bundles. Under the condition of higher temperature, the flow speed of the matrix could be improved. However, part of the matrix was extruded during the extrusion process, and cracks and other defects occurred during the loading, which caused the brittle fracture of the specimen.
采用真空浸渍热压成型实验系统（VIHPS）制备了挤出温度为30、40、50、60和70℃的氧化石墨烯-碳纤维/环氧树脂（GO-CF/EP）复合材料。研究了挤出温度对GO-CF/EP复合材料微观结构、断裂机理和力学性能的影响。结果表明，在50℃时复合材料的力学性能最佳，基体在纤维间隙中的浸润效果最好，复合材料的弯曲强度达到728MPa。纤维在基体的包裹下被拔出并断裂。挤出温度较低时，基体粘度高、流动性差，基体浸润不良导致许多纤维未能粘结在一起，造成纤维束无序断裂。在较高温度条件下，基体的流动速度可以提高。然而，在挤出过程中部分基体被挤出，加载过程中出现裂纹等缺陷，导致试样发生脆性断裂。
