新型浆料注射法制备C/C复合材料的显微组织及力学性能

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Abstract C/C composites were fabricated by novel slurry injection and chemical vapor infiltration (CVI). In the slurry injection step, natural flake graphite was introduced to carbon fiber preform. Microstructure and mechanical properties of the as-fabricated C/C composites were analysed by X-ray nondestructive test, scanning electron microscope (SEM) polarizing microscope (PLM), and mechanical properties test. The results show that the flake graphite which replaces part of pyrolytic carbon can be introduced by slurry injection. This injected flake graphite can provide additional nucleation sites thereby greatly promoting densification rate of CVI process. The addition of natural flake graphite is beneficial to the formation of rough lamina (RL) pyrolytic carbon (PyC) and increases the degree of graphitization of the composites. After 80 h CVI, C/C composites with a density of 1.68 g/cm³ and a flexural strength of 69.07 MPa are obtained. Compared with the C/C composites fabricated by traditional CVI process, the flexural strength is close while the average densification rate is nearly tripled. Moreover, carbon fibers and flake graphite are well connected by PyC and the obtained C/C composites shows pseudo-plasticity fracture.

Key words： slurry injection CVI C/C composites microstructure mechanical properties

Received: 03 December 2019 Published: 19 June 2020

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	HU Jiao
	LI Guodong
	ZHANG Yang
	HAN Qianwu
	JIANG Yi

Cite this article:

HU Jiao,LI Guodong,ZHANG Yang, et al. Microstructure and mechanical properties of C/C composites prepared by a novel slurry injection technique[J]. Materials Science and Engineering of Powder Metallurgy, 2020, 25(2): 171-178.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2020/V25/I2/171

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