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The characterization of high-performance PAN-based carbon fibers developed by continuous carbonization and air oxidation

Published online by Cambridge University Press:  03 March 2011

Tse-Hao Ko ,
Chien-Hung Li  and
Chung-Hua Hu
Tse-Hao Ko
Affiliation:
Department of Materials Science, College of Science, Feng Chia University, Taichung, Taiwan, Republic of China
Chien-Hung Li
Affiliation:
Department of Materials Science, College of Science, Feng Chia University, Taichung, Taiwan, Republic of China
Chung-Hua Hu
Affiliation:
Department of Materials Science, College of Science, Feng Chia University, Taichung, Taiwan, Republic of China
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Abstract

The properties of four kinds of Type II carbon fibers, which had been precarbonized at 300 °C, 400 °C, 500 °C, and 600 °C, respectively, during two-stage continuous carbonization, were measured after being air oxidized for periods of 1 to 6 min at 550 °C. The effects of precarbonization temperature on mechanical properties, density, morphology, elemental composition, and microstructure of the carbon fibers during the air oxidation are discussed in this article. The precarbonization process strongly affected the surface properties and mechanical properties of the final oxidized carbon fibers. The carbon fibers developed from the different precarbonization temperatures all had different structures. The carbon fibers that had been precarbonized at 300 °C had a more ordered structure than other fibers after air oxidation. These carbon fibers also had a higher performance than the other fibers. Carbon fibers also showed different oxidation behaviors caused by differences in surface morphology resulting from each different precarbonization temperature. Optimum conditions not only improved the tensile strength and modulus, but also increased the density and oxygen content. Experimental results showed that the tensile strength of the carbon fibers precarbonized at 300 °C increased from 2.4 GPa to 4.3 GPa (80%) after 6 min oxidation at 550 °C.

Type
Articles
Information
Journal of Materials Research , Volume 10 , Issue 6 , June 1995 , pp. 1529 - 1538
Copyright
Copyright © Materials Research Society 1995

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