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用两种经高温处理的碳纤维织物 ,以酚醛树脂作为基体先驱体 ,制备了二维C/C复合材料。通过扫描电镜 (SEM)、X—射线光电子能谱 (XPS)研究了两种碳纤维 (TCF和JCF)的表面状态 ,测试了C/C复合材料 (TCC和JCC)的层间剪切强度、拉伸性能。SEM观察表明 ,TCF及JCF表面都有沟槽 ,但TCF横断面呈腰子形非圆形 ;XPS分析表明TCF表面含氧官能团数量多。力学测试结果为 :TCC层间剪切强度 (ILSS)高于JCC ,达到 16 .1MPa ;TCC拉伸强度、模量均高于JCC ,而JCC断裂延伸率达 1.1% ,是TCC的 3倍。拉伸断口SEM分析表明 ,TCC断口平整 ,无纤维拨出 ,呈脆断 ;JCC断口有纤维拨出 ,是纤维控制的多层基体断裂
Two types of C / C composites were prepared by using two kinds of high-temperature treated carbon fiber fabrics and phenolic resin as matrix precursor. The surface states of two kinds of carbon fibers (TCF and JCF) were investigated by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The interlaminar shear strength of C / C composites (TCC and JCC) Stretch performance. The SEM observation showed that there were grooves on the surface of TCF and JCF, but the cross section of TCF was kidney-shaped non-circular. XPS analysis showed that there were many oxygen-containing functional groups on the surface of TCF. The results of mechanical tests show that the interlaminar shear strength (TCC) of TCC is higher than that of JCC, reaching 16.1MPa. The tensile strength and modulus of TCC are all higher than that of JCC, while the elongation at break of JCC is 1.1%, which is three times that of TCC. Tensile fracture SEM analysis showed that the fracture of TCC was smooth and no fiber was dislocated, which was brittle fracture. The fiber of JCC fractured out was the fracture of multi-layer matrix controlled by fiber