Evolution of electrical properties and microstructure of polyacrylonitrile‑based carbon fibers during carbonization

서지정보

ㆍ발행기관 : 한국탄소학회 ㆍ수록지정보 : Carbon letters / 32권 / 7호
ㆍ저자명 : Jiyin Yu, Yong Liu, Xueni Hua, Weifeng Du, Chen Ning, Yuhui Ao, Lei Shang

목차

Abstract
1 Introduction
2 Experimental
2.1 Specimens
2.2 Characterization
3 Results and discussion
3.1 Morphologies of high temperature carbon fibers
3.2 The relationship between element content and resistivity of high-temperature carbonized fiber
3.3 The microcrystal of high temperature carbonized fibers
3.4 Raman analysis of fiber microstructure
3.5 Analysis of mechanical properties of high temperature carbonized fiber
4 Conclusions
Acknowledgements
References

영어 초록

The evolvement in the microstructure and electrical properties of PAN-based carbon fibers during high-temperature carbonization were investigated. The study showed that as the heat treatment temperature increases, the change of carbon fiber resistivity around 1100 °C can be divided into two stages. In the first stage, the carbon content of the fiber increased rapidly, and small molecules such as nitrogen were gradually released to form a turbostratic of carbon crystal structure. The resistivity dropped rapidly from 3.19 × 10− 5 Ω·m to 2.12 × 10− 5 Ω·m. In the second stage, the carbon microcrystalline structure gradually became regular, and the electron movement area gradually became larger. At this time, the resistivity further decreases, from 2.12 × 10− 5 Ω·m to 1.59 × 10− 5 Ω·m. During carbonization, the tensile strength of carbon fiber first increased and then decreased. This is because the irregular and disordered graphite structure is formed first. As the temperature rose, the graphite layer spacing decreased and the grain thickness gradually increases. The modulus also gradually increased.

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