热处理升温速率对中空多孔炭纤维介电常数的影响

doi:10.3724/SP.J.1077.2011.00939

无机材料学报 ›› 2011, Vol. 26 ›› Issue (9): 939-943.DOI: 10.3724/SP.J.1077.2011.00939 CSTR: 32189.14.SP.J.1077.2011.00939

热处理升温速率对中空多孔炭纤维介电常数的影响

谢炜¹, 程海峰², 匡加才³, 陈朝辉², 楚增勇², 龙春光¹

(1. 长沙理工大学汽车与机械工程学院, 长沙 410114; 2. 国防科技大学新型陶瓷纤维及其复合材料国防科技重点实验室, 长沙 410073; 3. 长沙理工大学材料科学与工程研究所, 长沙 410114)

收稿日期:2010-11-19 修回日期:2010-12-27 出版日期:2011-09-20 网络出版日期:2011-08-19
作者简介:谢炜(1980-), 男, 博士, 讲师. E-mail: xwxw00@163.com
基金资助:
国家自然科学基金(50403010); 湖南省自然科学基金(08JJ3100); 湖南省科技计划项目(2010FJ4094)

Effect of Heating Rate on the Complex Permittivity of Hollow-porous Carbon Fibers

XIE Wei¹, CHENG Hai-Feng², KUANG Jia-Cai³, CHEN Zhao-Hui², CHU Zeng-Yong², LONG Chun-Guang¹

(1. College of Automotive and Mechanical Engineering, Changsha University of Science and Technology, Changsha 410114, China; 2. Key Lab of Advanced Ceramic Fibers & Composites, National University of Defense Technology, Changsha 410073, China; 3. Institute of Materials Science and Engineering, Changsha University of Science and Technology, Changsha 410114, China)

Received:2010-11-19 Revised:2010-12-27 Published:2011-09-20 Online:2011-08-19
Supported by:
National Natural Science Foundation of China (50403010); Natural Science Foundation of Hunan (08JJ3100); The Planned Science and Technology Project of Hunan Province (2010FJ4094)

摘要/Abstract

摘要： 以中空多孔聚丙烯腈(PAN)原丝为原料, 通过预氧化和炭化工艺制备了中空多孔炭纤维, 研究了预氧化和炭化升温速率对其微观结构、元素组成、电导率和介电常数的影响. 研究结果表明, 热处理升温速率对中空多孔炭纤维微观结构影响很大. 随热处理升温速率增大, 所得中空多孔炭纤维体电导率和介电常数依次降低. 预氧化升温速率为0.5℃/min所得炭纤维体电导率为1997.14 S/m, 4℃/min时下降到153.39 S/m, 中空多孔炭纤维/石蜡复合材料介电常数的ε″ 则从70.35降低到6.99. 热处理升温速率引起中空多孔炭纤维碳含量和孔隙的变化, 可用来调节中空多孔炭纤维的电导率和介电常数.

关键词: 中空多孔炭纤维, 预氧化, 炭化, 介电常数

Abstract: A series of polyacrylonitrile-based hollow-porous carbon fibres (PAN-HPCFs) were prepared by oxidating PAN hollow-porous fibers in air and carbonizing their cured fibers in nitrogen. The effects of preoxidation and carbonization heating rate on the microstructure, composition, electrical volume conductivity and complex permittivity were investigated. The microstructure of the obtained PAN-HPCFs is changed greatly by the heating rate. The electrical volume conductivity and complex permittivity decrease with the increase of heating rate. The electrical volume conductivity is in the range 1997.14 S/m to 153.39 S/m with the preoxidation heating rate increasing from 0.5℃/min to 4℃/min. At 2 GHz, the value of ε″ of composites of paraffin and PAN-PHCFs decreases from 70.35 to 6.99 when preoxidation heating rate increases form 0.5℃/min to 4℃/min. Results indicate that the electrical conductivity and complex permittivity of PAN-HPCFs can be adjusted by the heating rate.

Key words: hollow-porous carbon fibers, preoxidation, carbonization, complex permittivity

中图分类号:

TB34

谢炜, 程海峰, 匡加才, 陈朝辉, 楚增勇, 龙春光. 热处理升温速率对中空多孔炭纤维介电常数的影响[J]. 无机材料学报, 2011, 26(9): 939-943.

XIE Wei, CHENG Hai-Feng, KUANG Jia-Cai, CHEN Zhao-Hui, CHU Zeng-Yong, LONG Chun-Guang. Effect of Heating Rate on the Complex Permittivity of Hollow-porous Carbon Fibers[J]. Journal of Inorganic Materials, 2011, 26(9): 939-943.

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热处理升温速率对中空多孔炭纤维介电常数的影响

Effect of Heating Rate on the Complex Permittivity of Hollow-porous Carbon Fibers

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