异形截面碳纤维及其对复合材料力学性能的影响

Irregular Section Carbon Fiber and its Effects on Mechanical Properties of Composite

介绍一种异形截面碳纤维,并对其环氧复合材料的力学性能进行研究。对该碳纤维表面特性和本体结构及碳纤维/环氧复合材料的常规力学性能、破坏模式和纤维堆砌方式进行初步分析,并与T300碳纤维及其环氧复合材料进行比较。结果表明,与T300相比该异形截面碳纤维的截面为“腰”形,表面光滑,化学活性差,石墨化程度低,但其比表面积大,对液体的浸润性能好;异形截面碳纤维/环氧复合材料的力学性能达到或者接近T300环氧复合材料;异形截面碳纤维与树脂基体的界面结合较弱,纤维在材料中的分布均匀性差。

A kind of irregular section carbon fiber and its epoxy composite were involved. The surface performance and fabric of carbon fiber were tested, and mechanical properties, damaged pattern and fiber arrange way of composite were analyzed. The irregular section fiber and its composite were compared with T300 and T300/epoxy composite. It was shown that the cross-section shape of irregular fiber was kidney-shaped, the surface of irregular fiber was smooth, the surface chemical activity of irregular fiber was weak and the degree graphitization of irregular fiber was low. But it was revealed that the irregular fiber had a larger specific surface area and greater wetting ability with liquid than T300. By the mechanical property measure, the performance of irregular fiber/epoxy composite approached to T300/epoxy composite. It was indicated by SEM that the interfacial adhesion of irregular carbon fiber/epoxy composite was poor and the distribution of irregular fiber in composite was uneven.