国产T800级碳纤维/环氧树脂复合材料湿热性能

摘要

Scanning electron microscope (SEM) was used to study the morphologies of 3 kinds of domestic T800 carbon fiber (CCF800). Infrared spectrogram was used to analyse the structure of CCF800 sizing agent. In order to study the hygrothermal properties of domestic CCF800/epoxy composites, moisture absorption behavior and interlaminar shear property under hygrothermal environment were tested. Furthermore, SEM was used to study the interface between carbon fiber and epoxy after hygrothermal treatment. The results show that the morphologies of the 3 kinds of CCF800 are similar, while the chemical structures of sizing agent have a difference. The three kinds of CCF800/epoxy composite share the similar saturated moisture absorption period, that is about 54 days. And 95% saturated moisture absorption period is also the same, that is about 30 days. However, there is a obvious difference in saturated moisture absorption. In CCF800-3 sizing agent, the highest content of hydroxy leads to the highest moisture absorption rate of its epoxy resin matrix composite, and the interlaminar shear strength decreases most obviously under the action of high temperature and high humidity.%采用扫描电镜、红外图谱分析三种国产T800级碳纤维的物理形貌以及表面上浆剂的化学结构。针对三种国产T800级碳纤维（CCF800）/环氧树脂复合材料在湿热环境下的吸湿行为，研究经不同时间湿热和高温环境下处理后的层间剪切性能，并通过扫描电镜观察湿热处理后的复合材料界面结合状态。结果表明：三种国产T800级碳纤维表面物理形貌相同，而表面化学结构存在一定差异；三种碳纤维环氧复合材料的“饱和”吸湿周期相同，约为54 d，95%饱和吸湿周期也相同，约为30 d；而饱和吸湿量存在明显差异，其中3号纤维上浆剂中由于羟基含量最高，导致其环氧树脂基复合材料吸湿率最高，在高温高湿作用下，层间剪切强度下降最为明显。