石墨烯添加对SiC<sub>f</sub>/SiC复合材料性能的影响

doi:10.19976/j.cnki.43-1448/TF.2022001

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Abstract In this paper, graphene contained SiC_f/SiC composites were prepared by a two-step process, with graphene/SiC slurry introduced by slurry brushing first, then followed a chemical vapor infiltration of SiC matrix. The effects of graphene mass fraction in the slurry on the microstructure, mechanical properties and thermal conductivity of SiC_f/SiC composites were studied by using scanning electron microscopy, three-point bending test and laser flash apparatus. The results show that, when the mass fraction of graphene is 2%, the distribution of graphene in the slurry layer is uniformly, resulting in the highest thermal conductivity of 13.14 W/(m·K) of the composites. With the increase of the mass fraction, the distribution of graphene in the slurry layer is deteriorated, which leads to a decrease of the density and thermal conductivity of SiC_f/SiC composites. However, although graphene begins to agglomerate at a mass fraction of 4%, the composites possess the highest flexural strength of 328.12 MPa, due to the well bonding between graphene and the SiC matrix.

Key words： graphene SiC_f/SiC composites chemical vapor infiltration mechanical property thermal conductivity

Received: 05 January 2022 Published: 19 July 2022

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	WANG Xuhui
	CHEN Zhaoke
	LI Guowang
	SU Kang
	MAO Jian
	XIONG Xiang

Cite this article:

WANG Xuhui,CHEN Zhaoke,LI Guowang, et al. Effect of graphene introduction on properties of SiC_f/SiC composites[J]. Materials Science and Engineering of Powder Metallurgy, 2022, 27(3): 294-301.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2022001 OR http://pmbjb.csu.edu.cn/EN/Y2022/V27/I3/294

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