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预氧丝原位炭化无粘结剂C/C复合材料氧化动力学研究
引用本文:刘其城,周声励,贺持缓,陈宗璋.预氧丝原位炭化无粘结剂C/C复合材料氧化动力学研究[J].湖南大学学报(自然科学版),2000,27(4):40-43,56.
作者姓名:刘其城  周声励  贺持缓  陈宗璋
作者单位:湖南大学化学化工学院,湖南长沙,410082
基金项目:浙江省湖州市自然科学基金,国家重点实验室基金,98JJY2058,A9507,,
摘    要:采用恒温热重法测定了在空气中,0.1MPa,673K到973K下预氧丝(即预氧化聚丙烯腈纤维)原位炭化无粘结剂C/C复合的氧化失重率;并利用扫描电镜分析了这种复合材料氧化前后的结构,氧化动力学测定结果表明:该材料在氧化开始时,其氧化速率随时间的增长而增大,然后随时间的延长而减小,并趋向恒定,研究表明:该材料中预氧丝与基体炭界面结合处是空气中氧的扩散通道,杂质为空气中氧的吸附起到了有附活性中心的催化

关 键 词:预氧丝  原位炭化  无粘结剂  C/C复合材料
文章编号:1000-2472(2000)04-0040-04

A Study on the Oxidation Dynamics of Binderless C/C Composites Prepared by In-situ Carbonization of Pre-oxidized Fibres
LIU Qi-cheng,ZHOU Sheng-mai,HE Chi-huan,CHEN Zong-zhang.A Study on the Oxidation Dynamics of Binderless C/C Composites Prepared by In-situ Carbonization of Pre-oxidized Fibres[J].Journal of Hunan University(Naturnal Science),2000,27(4):40-43,56.
Authors:LIU Qi-cheng  ZHOU Sheng-mai  HE Chi-huan  CHEN Zong-zhang
Institution:LIU Qi-cheng ,ZHOU Sheng-mai ,HE Chi-huan ,CHEN Zong-zhang (College of Chemistry and Chemical Engineering. Hunan Univ,Changsha 410082,China)
Abstract:The oxidation weight loss rate of binderless C/C composite prepared by in-situ carbonization of pre-oxidized fibres(PAN) was tested in the air,at 0.1 Mpa,from 673 K to 973 K using thermo-weight analysis method. The textures of this material before and after oxidation were analyzed under SEM. The test results show that the oxidation rate increases with the temperature going up at the beginning of oxidation,then,decreases and tends to steady state. The results show that the interface between carbon fibres and matrix carbon offers a passage for oxygen spreading,and the impurities in the material act as an active absorption center of oxygen. The dominant step for oxidation is the dissociation of absorbed oxygen.
Keywords:Pre-pxidized fibre  in-situ carbonization  binderless  C/C composites  oxidation dynamics
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