论文部分内容阅读
用ICI生产的PEEK／AS4复合材料为样品,采用扫描电镜、光学显微镜和超声检测技术,结合化学浸湿技术,测定了复合材料的微观结构,包括基体树脂聚集态结构和增强材料碳纤维的排列结构,纤维／基体的界面结构和复合材料的物理性能．实验结果表明:该复合材料中碳纤维的体积分数为60％,平均直径为6．9μm,碳纤维排列均匀．碳纤维规整的排列在复合材料中,加强了复合材料中纤维的取向性能,决定了该复合材料的各向异性特征．聚醚醚酮树脂在复合材料中呈现典型的球状结构,这种晶体结构发生在树脂相或纤维表面,导致聚醚醚酮基体和碳纤维之间存在良好的界面结合力．在预浸层模压制成复合材料片材时,可以观察到在邻层之间有一个树脂密度较大的区域,这种现象在(±45)4s复合材料中尤为明显．这些树脂区域在复合材料中可以吸收能量,对复合材料的抗疲劳性能具有很大影响．
The PEEK / AS4 composites produced by ICI were used as samples. The microstructure of the composites was determined by scanning electron microscopy, optical microscopy and ultrasonic testing combined with chemical wetting technique. The microstructures of the composites were investigated, including the aggregation structure of matrix resin and the arrangement of reinforcing carbon fibers , The fiber / matrix interface structure and the physical properties of the composite. The experimental results show that the volume fraction of carbon fiber in the composite is 60%, the average diameter is 6.9μm, and the carbon fibers are arranged uniformly. The regular alignment of the carbon fibers in the composite material enhances the orientation of the fibers in the composite material and determines the anisotropy characteristics of the composite material. Polyetheretherketone resin presents a typical spherical structure in the composite material. This crystal structure occurs on the resin phase or fiber surface, resulting in good interfacial adhesion between the polyetheretherketone matrix and the carbon fiber. In the prepreg compression molding of composite sheets, it is observed that there is a region of greater resin density between adjacent layers, a phenomenon that is particularly noticeable in (± 45) 4s composites. These resin areas absorb energy in the composite and have a significant impact on the fatigue properties of the composite.