CCF300-3K炭纤维和KD-II碳化硅纤维的微观结构与力学性能

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Abstract The microstructure and mechanical properties of domestic CCF300-3K carbon fiber and KD-II SiC fiber were characterized. The mechanical properties of fibers were measured by tensile test of monofilament. The surface and tensile fracture morphology and inner structure of fibers were observed by SEM, AFM and TEM. The amorphous phase composition of KD-II SiC fibers were determined by XPS. The crystallinity and crystallite size were analyzed by XRD. Some data references for the preparation and application of the fibers were provided. The results show that, there are a large number of grooves on the surface of CCF300-3K carbon fiber which leads to the increasing of surface roughness; The graphite microcrystals with low crystallinity axially distribute along the fiber, and the space between graphite microcrystals is filled with amorphous carbon; The fracture source of the tensile fracture is the grooves on the fiber surface. The surface of KD-II SiC fiber is smooth and the roughness is too small; The grains of silicon carbide with good crystallinity randomly distribute in the matrix which composed of amorphous SiO_xC_y and free carbon; The fracture source of the tensile fracture is the internal hole or inclusion. The Weibull statistical analysis indicate that the tensile strength of CCF300-3K carbon fiber and KD-II SiC fiber are 3.08?0.02 GPa and 2.36?0.03 GPa, shape parameter of m value are 6.46 and 9.27, respectively. These shows that they have good structure, high mechanical properties and stability, which are fully meeting the requirements of engineering applications.

Key words： CCF300-3K carbon fiber KD-II SiC fiber microstructure mechanical properties weibull statistical analysis

Received: 27 February 2018 Published: 12 July 2019

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	HU Guangmin
	YANG Fenghao
	HE Haoyuan
	YI Maozhong

Cite this article:

HU Guangmin,YANG Fenghao,HE Haoyuan, et al. Microstructure and mechanical properties of CCF300-3K carbon fiber and KD-II SiC fiber[J]. Materials Science and Engineering of Powder Metallurgy, 2018, 23(5): 467-474.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2018/V23/I5/467

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