短纤维增强C/C-SiC复合材料的微观结构与力学性能

doi:10.11868/j.issn.1001-4381.2022.000002

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Abstract

One-staged forming of porous C/C composites as well as volume fraction control of pores were realized, based on thermophysical property analysis and proportioning design of raw materials. Short fiber reinforced C/C-SiC composites with high densification and low content of residual Si were prepared by hot-pressing-infiltration two-step method at low temperature. The structural evolution of C/C-SiC composites was analyzed in detail, the mechanical properties as well as failure behaviors were also investigated. Results show that the porous C/C composites present bipolar distribution in pore size, adding aramid fibers is an effective method to improve the connectivity of network pores, exhibiting a significant regulatory effect. Both SiC network skeleton and pinning structure with strong interface between SiC matrix and carbon fiber bundle can entrust the excellent mechanical properties of C/C-SiC composites with high carbon fiber content. In addition, the fracture toughness of C/C-SiC composites can be improved significantly with the addition of aramid fibers, resulting in the increase of crack propagation path. The isotropic distribution of carbon fiber in plane and the uniform distribution of ceramic phase between layers play a positive role in improving the bearing capacity and friction stability of C/C-SiC composites.

Key words： C/C-SiC composites hot pressing-infiltration two-step method microstructure mechanical property

Received: 11 January 2022 Published: 18 July 2022

ZTFLH:

TB332

Corresponding Authors: Yalei WANG E-mail: yaleipm@csu.edu.cn

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	Congcong LIU
	Yalei WANG
	Xiang XIONG
	Zhiyong YE
	Zaidong LIU
	Yufeng LIU

Cite this article:

Congcong LIU,Yalei WANG,Xiang XIONG, et al. Microstructure and mechanical property of short fiber reinforced C/C-SiC composites[J]. Journal of Materials Engineering, 2022, 50(7): 88-101.

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http://jme.biam.ac.cn/EN/10.11868/j.issn.1001-4381.2022.000002 OR http://jme.biam.ac.cn/EN/Y2022/V50/I7/88

TG-DSC curves of phenolic resin (a) and aramid fiber (b)

Raw material ratios of carbon fiber reinforced resin composites

Preparation process of short fiber reinforced C/C-SiC composites

Microscopic morphologies of fiber reinforced resin composites
(a), (b)without aramid fiber; (c), (d)with aramid fiber; EDS results of position 1(e), 2(f)

Low magnification (1) and high magnification (2) microscopic morphologies of porous C/C composites
(a)CR-C/C composites; (b)CRF-C/C composites

Pore reconstruction diagrams (1) and ball-and-stick models (2) of porous C/C composites
(a)CR-C/C composites; (b)CRF-C/C composites

Pore structural parameters of porous C/C composites

Differential curves of pore size distributions for porous C/C composites

XRD patterns of short fiber reinforced C/C-SiC composites

Microscopic morphologies of short fiber reinforced C/C-SiC composites
(a)CR-C/C-SiC composites; (b)CRF-C/C-SiC composites; (c), (d)SiC skeletons; (1)low magnification; (2)high magnification

Mechanical properties of short fiber reinforced C/C-SiC composites

Flexural load-displacement curves of short fiber reinforced C/C-SiC composites

Bending fracture morphologies of short fiber reinforced C/C-SiC composites
(a)CR-C/C-SiC composites; (b)CRF-C/C-SiC composites; (1)low magnification; (2)high magnification

Compression fracture morphologies of short fiber reinforced C/C-SiC composites
(a)CR-C/C-SiC composites; (b)CRF-C/C-SiC composites; (1)low magnification; (2)high magnification

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