热处理对PAN基炭纤维微观结构和力学性能的影响

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Abstract The PAN-based carbon fibers were heat-treated at temperatures ranging from 1 000 ℃ to 1 800 ℃. The microstructure and mechanical properties of the carbon fibers were analyzed by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and single-fiber tensile test. The results show that the nitrogen content of PAN-based carbon fibers decreases and the surface roughness decreases first and then increases with increasing the heat treatment temperature. The microstructure in the skin region suggests that the turbostratic graphite structure gradually transforms into a three-dimensional graphite structure during heat treatment. The continuity of the graphite crystallites is improved due to the coalescence between adjacent graphite crystallites. The observation of the fracture morphologies shows that the crack initiation and propagation are controlled by the microstructure and defects of carbon fibers in the skin region. Due to the improvement of the cross-linking between the graphite crystallites, the tensile strengths of carbon fibers heat-treated at 1 200 ℃ and 1 400 ℃ increase to 4.68 GPa and 4.59 GPa respectively, which are higher than that of the as-received carbon fibers. The tensile strength of the carbon fibers is mainly determined by the amount of defects in the skin region, the cross-linking between the graphite crystallites and the interfacial residual stress.

Key words： carbon fiber heat treatment microstructure graphite crystallite mechanical property

Received: 25 October 2018 Published: 12 July 2019

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	XU Yixi
	YANG Fenghao
	WANG Xiyun
	YI Maozhong

Cite this article:

XU Yixi,YANG Fenghao,WANG Xiyun, et al. Effects of heat treatment on the microstructure and mechanical property of PAN-based carbon fibers[J]. Materials Science and Engineering of Powder Metallurgy, 2019, 24(2): 147-153.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2019/V24/I2/147

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