热处理对中间相沥青-碳纤维黏结界面相容性的影响  

Effect of Heat Treatment on Interfacial Compatibility of Mesophase Pitch-Carbon Fiber Binding

作　　者：欧阳婷[1,2] 陈云博 蒋朝 李果[1,2] OUYANG Ting;CHEN Yunbo;JIANG Zhao;LI Guo(College of Materials Science and Engineering,Hunan University,Changsha 410082,China;Hunan Provincial Key Laboratory for Advanced Carbon Materials and Applied Technology,Changsha 410082,China)

机构地区：[1]湖南大学材料科学与工程学院,湖南长沙410082 [2]先进炭材料及应用技术湖南省重点实验室,湖南长沙410082

出　　处：《湖南大学学报（自然科学版）》2021年第6期24-29,共6页Journal of Hunan University:Natural Sciences

基　　金：湖南省自然科学基金资助项目(2018JJ3044)。

摘　　要：中间相沥青在碳化过程中轻组分不断逸出而发生剧烈膨胀,对以其为黏结剂或基体的碳纤维增强复合材料的界面结合性能有显著影响.利用TG、XRD和SEM等考察了预氧化条件对碳纤维的热稳定性、碳收率、晶体结构和纤维在乙醇水溶液中分散性的影响规律.从多个预氧化条件中甄选出以270℃保温150 min处理的氧化纤维进行碳化条件影响规律的考察.利用光学显微镜观察发现700~900℃碳化的碳纤维直径变化最显著.利用FTIR和SEM考察不同碳化温度碳纤维与中间相沥青黏结剂制备的碳黏碳纤维网络体的界面相容性.结果表明,500℃碳化的碳纤维与碳质黏结剂的结合紧密,结点平滑无裂纹,具有优异的界面相容性.500℃碳化的碳纤维与中间相沥青黏结剂在后续碳化处理中共同经历碳结构的主要形成阶段,可改善黏结界面,为提高材料性能提供有效途径.Mesophase pitch suffers severe expansion during carbonization due to the escape of light components,which significantly affect the interfacial compatibility of carbon fiber reinforced composites where mesophase pitch is used as binders or matrix.In this work,the effects of oxidation treatment on pitch fibers thermal stability,carbon yield,crystalline structure and dispersivity in alcohol aqueous solution were analyzed by TG,XRD and SEM.The fibers oxidized at 270℃for 150 min were then selected for further study on the influence of carbonization conditions.It was found that the diameter of carbon fibers(CFs)carbonized at 700~900℃changed significantly as observed by the optical microscope.The influence of carbonization temperature on interface compatibility between carbon fiber and mesophase pitch binders in carbon bonded carbon fiber composites was investigated using FTIR and SEM.The results show that the interface between CF carbonization at 500℃and binder was smooth and crack-free,showing excellent interface compatibility.As CFs carbonized at 500℃and mesophase pitch can experience a similar high-temperature carbonization process,during which a major transformation process of carbon structure occurs,the composite can be obtained with enhanced interfacial properties.

关 键 词：中间相沥青 预氧化 碳纤维 复合材料 碳纤维网络体 

分 类 号：TB332[一般工业技术—材料科学与工程]