Effect of Carbon Matrix Structure on Electrical Properties of C/C Composites

doi:10.11901/1005.3093.2019.321

Chinese Journal of Materials Research

2019, Vol. 33

Issue (12): 935-941 DOI: 10.11901/1005.3093.2019.321

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Effect of Carbon Matrix Structure on Electrical Properties of C/C Composites

Shengyang PANG¹,Feng LIU²,Chenglong HU¹,Shijun WANG¹,Sufang TANG¹(

)

1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110116, China
2. Institute of Spacecraft System Engineering, China Academy of Space Technology, Beijing 100094, China

Cite this article:

Shengyang PANG,Feng LIU,Chenglong HU,Shijun WANG,Sufang TANG. Effect of Carbon Matrix Structure on Electrical Properties of C/C Composites. Chinese Journal of Materials Research, 2019, 33(12): 935-941.

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Abstract

C/C composites with different carbon matrix structures were prepared by CVI(chemical vapor infiltration) +PIC(resin precursor impregnation cracking) process using 2D carbon fiber needle-punched preforms as reinforcement and then were heat-treated at different temperatures. The effect of PyC (pyrolysis carbon)/ReC (resin carbon) ratio and degree of graphitization on the electrical resistivity of the composites was investigated. The results show that the electrical resistivity of the C/C composites of low density remains basically unchanged in a range of 27.3×10^-6~28.0×10^-6 Ω·m with the increase of PyC/ReC, which can be mainly attributed to the opposite effect of the increase of lattice size and structural integrity of graphite microcrystals and the increase of porosity of the composites. However, the electrical resistivity of C/C composites of high density decreases from 24.9×10^-6 Ω·m to 20.5×10^-6 Ω·m with the increase of PyC/ReC ratio. Because the slight increase of the porosity has a small contribution on the difference of electrical resistivity by hindering the effective carrier transfer in the conductive network for the C/C composites of low porosity. The graphitization degree of C/C composites increases and the electrical resistivity decreases with the heat treatment temperature increased from 1800℃ to 2500℃, which can be mainly attributed to the increase of carrier concentration and the weakening of grain boundary scattering.

Key words: composite electrical resistivity carbon matrix graphitization

Received: 01 July 2019

ZTFLH:

TB332

Fund: National Natural Science Foundation of China(U1537204);National Natural Science Foundation of China(51802313);National Key R & D Program of China(2018YFF01013600);Equipment Research Foundation(61409220101);Research Fund of Youth Innovation Promotion Association of CAS(2014171)

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	Shengyang PANG
	Feng LIU
	Chenglong HU
	Shijun WANG
	Sufang TANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2019.321 OR https://www.cjmr.org/EN/Y2019/V33/I12/935

Fig.1 Microstructure of low density C/C composites (a) PyC:ReC=0.08; (b) PyC:ReC=0.32; (c) PyC:ReC=0.77

Table 1 Porosity and electrical resistivity of C/C composites with different PyC/ReC ratios

Fig.2 Microstructure of high density C/C composites (a) PyC:ReC=0.09; (b) PyC:ReC=0.24; (c) PyC:ReC=0.50

Fig.3 Diagram of trajectory of electron motion in material

Fig.4 Microstructure of C/C composites after heat treatment (a) 1800℃; (b) 2100℃; (c)2300℃; (d) 2500℃

Table 2 Changes in open porosity of materials under different heat treatment processes

Fig.5 Raman spectra of C/C composites at different heat treatment temperatures

Table 3 I_D/I_GValue of C/C Composites (PyC/ReC=0.48) and different carbon elements at different heat treatment temperatures

Fig.6 Raman spectra of different carbon elements in raw state and heat treatment at 2300℃

Fig.7 Relationship between heat treatment temperature and resistivity

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