无机材料学报2011，Vol.26Issue(9)：939-943,5.DOI:10.3724/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
Effect of Heating Rate on the Complex Permittivity of Hollow-porous Carbon Fibers
摘要
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.关键词
中空多孔炭纤维/预氧化/炭化/介电常数Key words
hollow-porous carbon fibers/ preoxidation/ carbonization/ complex permittivity分类
通用工业技术引用本文复制引用
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):939-943,5.基金项目
国家自然科学基金(50403010) （50403010）
湖南省自然科学基金(08JJ3100) （08JJ3100）
湖南省科技计划项目(2010FJ4094) （2010FJ4094）
