碳纤维在高温碳化过程中微观结构和性能的关系  

Relationship Between Microstructure and Properties of Carbon Fiber During Carbonization at High Temperature

作　　者：于继胤 李俊锋 宁臣 敖玉辉[1] 郭佩佩 尚垒[1] YU Ji-yin;LI Jun-feng;NING Chen;AO Yu-hui;GUO Pei-pei;SHANG Lei(College of Chemistry and Life Science,Jilin Province Key Laboratory of Carobn Fiber Development and Application,Changchun University of Technology,Changchun 130012,Jilin,China;Jilin Baojing Carbon Materials Co.,Ltd.,Jilin 132000,Jilin,China)

机构地区：[1]长春工业大学化学与生命科学学院,吉林省碳纤维开发与应用重点实验室,吉林长春130012 [2]吉林宝旌炭材料有限公司,吉林吉林132000

出　　处：《合成纤维》2022年第10期27-32,共6页Synthetic Fiber in China

基　　金：国家重点研发计划(2020YFB1505700);吉林省科技厅青年成长科技计划项目(20210508051RQ);中央引导地方科技发展专项基金(202002033JC)。

摘　　要：为了进一步深入理解碳化过程中纤维的组织结构演变规律,研究了高温碳化期间不同温区与聚丙烯腈(PAN)基碳纤维微观结构、电阻率和力学性能的关系。随着热处理温度升高,碳元素含量快速增加,同时碳纤维的电阻率从3.19×10^(-5)Ω·m迅速下降到1.59×10^(-5)Ω·m。在碳化期间,先形成不规则乱层石墨结构,随着温度升高,石墨层间距减小并且晶粒厚度逐渐增加,拉伸模量逐渐增大。石墨碳层变得有序,ID/IG从2.79减小到1.50,化学反应使sp3杂化碳转化为sp2杂化碳原子且微晶尺寸变小。In order to further understand the evolution of fiber structure during carbonization, the relationship between different temperature regions and the microstructure, resistivity and mechanical properties of polyacrylonitrile(PAN)-based carbon fibers during high-temperature carbonization was studied. With the increase of heat treatment temperature, the content of carbon element increases rapidly, and the resistivity of carbon fiber rapidly decreases from 3.19×10^(-5)Ω·m to 1.59×10^(-5)Ω·m. During carbonization, irregular turbostratic graphite structure is formed first, as the temperature increases, the graphite interlayer spacing decreases and the grain thickness increases gradually, and the tensile modulus increases gradually. The graphitic carbon layer becomes ordered, the ID/IGdecreases from 2.79 to 1.50, and the chemical reaction converts sp3-hybridized carbon to sp2-hybridized carbon atoms and the crystallite size becomes smaller.

关 键 词：PAN基碳纤维 高温碳化 晶体结构 力学性能 电阻率 

分 类 号：TQ342.74[化学工程—化纤工业]