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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    No. 5    October 2007

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Preparation of continuous Si-Fe-C-O functional ceramic fibers
CHEN Zhi-yan(陈志彦)1, LI Xiao-dong(李效东)2, WANG Jun(王 军)2, LI Wen-Fang(李文芳)1

1. School of Mechanical Engineering, South China University of Technology, Guangzhou 510640, China; 2. Key Laboratory of Ceramic Fibers and Composites, National University of Defense Technology, Changsha 410073, China

Abstract:A new polymer named polyferrocarbosilane(PFCS) was prepared from polydimethylsilane and ferrocene. The spinnability of this polymer can be tailored by controlling the content of ferrocene in the polymer. The prepared polymer was spun into a continuous polymer fiber that was subsequently cured in air and heat-treated finally in N2 up to 1 350 ℃ for conversion into Si-Fe-C-O fibers. The resulted Si-Fe-C-O fibers display low specific resistance and magnetic property due to the existence of Fe, which also reduces the specific resistance significantly to 10−2 Ω∙cm at room temperature when the amount of ferrocene in feed is as low as 3.0% (mass fraction). The resulted Si-Fe-C-O fibers, with C/Si molar ratio of about 1.3 and the maximum Fe content of about 2.0% (mole fraction), are composed of β-SiC and small amount of Fe3Si-like crystalline and have an average tensile strength of about 2.0 GPa.

 

Key words: continuous Si-Fe-C-O fiber; SiC fiber; polyferrocarbosilane; ferrocene; electromagnetic properties

ISSN 1672-7029
CN 43-1423/U

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