T800H碳纤维表面特性及T800H/BA9918复合材料湿热性能研究

为了研究T800H碳纤维的表面特性及其与BA9918树脂的界面匹配性,分别采用SEM、AFM、XPS和TGA对T800H碳纤维表面形貌、表面化学特性以及碳纤维上浆剂热稳定性进行表征,测试了T800H/BA9918复合材料湿热处理前后0°压缩强度、90°拉伸强度和层间剪切强度,并得到了其在湿热处理前后的开孔压缩和冲击后压缩性能.测试发现T800H碳纤维表面有明显的沟槽,有利于表面机械啮合作用;T800H/BA9918复合材料经29 J能量冲击后压缩强度为314 MPa;在130℃湿态环境下其0°压缩强度和层间剪切强度保持率高于58%,开孔压缩强度保持率高于60%.试验结果证明T800H碳纤维与BA9918树脂具有良好的界面匹配性,T800H/BA9918复合材料具有优异的耐湿热性能.

Study on surface characteristic of T800H carbon fiber and hygrothermal performance of T800H/BA9918 composite

This paper intends to analyze the surface characteristics of T800H carbon fiber and the interface matching performance between T800H and BA9918 resin. Scanning electronic microscopy ( SEM) , atomic force microscopy (AFM), X?ray photoelectron spectroscopy (XPS) and thermogravimetry analysis (TGA) were used to characterize the surface morphology/chemical properties of carbon fibers and the heat resistance of sizing agent. Then, the 0° compression strength, 90° tensile strength and interlaminar shear strength ( ILSS ) of T800H/BA9918 were tested before and after hygrothermal treatment. Last, the open hole compression and compression after impact performance of T800H/BA9918 were obtained. Tests found that there are obvious grooves in the surface of T800H, which benefits the interfacial mechanical engagement between fiber and resin. The compressive strength after a 29 J impact is 314 MPa. In 130℃ hygrothermal environment the retention ratio of 0° compression strength and ILSS are above 58% while open hole compression strength are above 60%. Test results demonstrates that T800H carbon fiber and BA9918 resin have good interface matching performance, and T800H/BA9918 composite material has good hygrothermal performance.