电流热退火效应对碳纤维导热性能的影响

doi:10.11896/cldb.19070222

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Abstract The polyacrylonitrile based carbon fiber (PAN-CF) was measured by transient electrothermal technology (TET), and the experimental phenomena were analyzed based on numerical simulation method to explore the effect of annealing temperature on thermal conductivity of PAN-CF. The relationship between graphitization and thermal conductivity of PAN-CF under current thermal annealing was analyzed. The thermal conductivity increases with the increases of annealing temperature. The highest average thermal conductivity is 16.27 W/(m·K). Ultimately, the average thermal conductivity of PAN-CF increases by 3.45 times. The temperature distribution along axial direction of fiber is not uniform in current annealing process. PAN-CF sample is broken at midpoint, and the temperature and thermal conductivity of sample breakpoint are maximum, which are 3 867 K and 96.74 W/(m·K) respectively. The thermal conductivity of sample breakpoint is 6.51 times higher than the average thermal conductivity under the same annealing current. The degree of graphitization of PAN-CF increases after current annealing, and the hybridization effect of carbon atoms reduces defect density of PAN-CF microstructure. Therefore, the thermal conductivity of PAN-CF increases after current annealing process.

Key words： polyacrylonitrile based carbon fiber (PAN-CF) current-induced thermal annealing thermal conductivity graphitization

Published: 14 July 2020

CLC number:

TB383

Fund:This work was financially supported by the China Postdoctoral Science Foundation (2017M612225), the National Natural Science Foundation of China (51506106) and Qingdao Science and Technology Plan (18-2-2-72-jch).

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	Articles by authors
	LIN Huan
	KOU Aijing
	ZHANG Jianlun
	DONG Hua

Cite this article:

LIN Huan,KOU Aijing,ZHANG Jianlun, et al. Effect of Current Thermal Annealing on Thermal Conductivity of Carbon Fibers[J]. Materials Reports, 2020, 34(14): 14198-14203.

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http://www.mater-rep.com/EN/10.11896/cldb.19070222 OR http://www.mater-rep.com/EN/Y2020/V34/I14/14198

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