碳纤维属于脆性材料,其断裂伸度很小,断裂是突然间开始和完成的。极大部分的断裂发生在有缺陷或缺陷集中的地方。因此,碳纤维的断裂面形貌与引起断裂的缺陷类型及分布有一定的关系。本文在我所高性能碳纤维研制的基础上,扼要地报道了用扫描电镜研究不同力学性能的碳纤维断裂面形貌,分析了产生不同断面形貌的原因,以及它对强度的影响。为碳纤维制造过程中工艺参数的选择提供依据。 Carbon fiber is a brittle material, its elongation is very small, breaking is a sudden start and finish. A large part of the rupture occurs where defects or defects are concentrated. Therefore, the morphology of the fracture surface of carbon fiber and fracture caused by the type and distribution of a certain relationship. In this paper, based on my research on high performance carbon fiber, the morphology of the fracture surface of carbon fiber with different mechanical properties was studied by scanning electron microscope. The reason of the different cross section morphology and the influence on the strength were analyzed. Carbon fiber manufacturing process parameters to provide the basis for the choice.