pdf 382 m - 哈尔滨工业大学学报.pdf

第20卷摇 第5期 材摇 料摇 科摇 学摇 与摇 工摇 艺 Vol.20 No.5 摇 摇 20 12年10月 MATERIALS SCIENCE TECHNOLOGY Oct. ,2012 摇 摇 摇 摇 摇 摇 不同初始结构碳纤维石墨化进程趋同性研究 高爱君,童元建,王小谦,徐樑华 (国家碳纤维工程技术研究中心 北京化工大学,北京 100029) 摘摇 要:为优化碳纤维的石墨化工艺,利用拉曼光谱对碳纤维在石墨化过程中的结构变化进行了研究,分析 比较了两种碳纤维石墨化进程的异同.结果表明:纤维在高温下发生脱氮与石墨化转变反应,脱氮反应会在 石墨微晶中留下分子级空洞,氮原子脱除越多,微晶内空洞越多;石墨化转变促使石墨微晶生长、结构完善. 两种纤维氮元素含量不同造成其初始结构不同,氮含量越低,纤维石墨化程度越高.氮原子脱除程度不同引 起两种纤维石墨化进程存在差异,热处理温度高于1 800 益时,不同初始结构碳纤维中的氮原子都脱除完 全,纤维中碳化学结构趋于相同,石墨化进程出现趋同性. 关键词:碳纤维;石墨化;趋同;拉曼光谱 中图分类号:TB321 文献标志码:A 文章编号:1005-0299(2012)05-0026-05 Research on convergence of graphitization with different initial structural carbon fibers GAO Ai鄄jun,TONG Yuan鄄jian,WANG Xiao鄄qian,XU Liang鄄hua (National Carbon Fiber Engineering Research Center,Beijing University of Chemical Technology,Beijing 100029,China) Abstract:To optimize the graphitization technology of carbon fibers,Raman spectroscopy was employed to characterize themicrostructureof PAN鄄basedcarbonfibersduringhightemperatureheattreatment,andgraphi鄄 tization processfor two kinds of carbon fiberswas analyzed and compared.The results show that the variety of carbon fibers爷structures can berepresentedby Raman spectroscopy parameters,such asthe Raman shiftsand full width at half maximum of main D and G bands.Denitrogenation induced defects,the more the amount of escaped N,the more the defects in the graphite layers.Decfectswere reduced by graphitization.The difference of the N content resulted in the structural differences between the two kinds of carbon fibers.When the heat treatmenttemperaturewashigherthan 1800 益,Nwouldescapecompletely,andthestructureforthetwo