国产800级碳纤维表面状态及其复合材料界面性能

Surface State of Domestic 800-grade Carbon Fibers and Interface Property of Composites

通过扫描电子显微镜（SEM）、原子力显微镜（AFM）、X射线光电子能谱（XPS）、复丝拉伸法、单丝拉伸法及单丝断裂法对3种国产800-12K碳纤维表面状态及其复丝拉伸性能、单丝复合体系的界面性能进行系统分析与研究。结果表明：3种国产800级碳纤维表面均较为光滑,纤维的粗糙度为9-17nm,纤维表面含氧量较高且稳定,O/C在0.23~0.27之间;3种国产800级碳纤维复丝拉伸强度相当,质量控制稳定,断裂伸长率为1.9左右,纤维与树脂基体匹配性较好;3种国产800级碳纤维单丝拉伸强度不稳定,纤维的表面化学活性对纤维与树脂基体的界面结合强度影响显著。

The surface and micro-interface property of three domestic 800-grade carbon fibers （1# , 2# , 3# ） were characterized by Scanning Electron Microscope （SEM） , Atomic Force Microscope （AFM） , X-ray Photoelectron Spectroscopy （XPS） , multifilament stretching method and single fiber fragmentation test. The results show that the surfaces of these three fibers are all smooth and the roughness is between 9-17nm. They all possess high content of oxygen, and the ratio of O/C of the three carbon fibers is between 0. 23-0. 27. The multifilament tensile property is similar, which reveals the domestic carbon fibers have stable quality control, and the breaking elongation rate of about 1. 9 revealing that the fiber and resin matrix matching is good. The tensile strength of single fiber is unsta-ble, meanwhile the high tensile surface active functional group has big influence on the interface shear strength of carbon fibers.