化学气相渗透法制备2.5D浅交弯联SiC<sub>f</sub>/SiC复合材料的结构与力学性能

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Abstract The tubular SiC_f/SiC composite materials were prepared by depositing SiC-PyC-SiC multi-interlayers on the SiC fibers with 2.5D curved shallow-crossing linking structure densified with SiC matrix using CH₃SiCl₃-H₂-Ar system by chemical vapor infiltration (CVI). The phase composition, microstructure, axial compression, radial crushing and circumferential tension and fracture morphology of SiC_f/SiC composites were investigated. The results show that SiC_f/SiC composites are mainly composed of SiC fiber, SiC-PyC-SiC multi-interlayers and SiC matrix. In the SiC-PyC-SiC multi-interlayers, the thickness of PyC interlayers is 700-800 nm, the thickness of SiC interface is 400-500 nm, and SiC matrix is mainly β-SiC phase. After densification, the density of SiC_f/SiC composites is 2.50-2.58 g/cm³, and the porosity is 7.70%-9.10%. The axial compressive strength of SiC_f/SiC composites is 53.2 MPa, and the radial crushing strength is 38.18 MPa. Compression is expressed as a shear failure in the 45° direction with the horizontal plane

Key words： CVI SiCf/SiC composites microstructure axial compressive radial crushing circumferential tensile

Received: 07 July 2017 Published: 12 July 2019

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	LI Yue
	ZHANG Ruiqian
	YANG Ping
	CHEN Zhaoke
	HE Zongbei
	XIONG Xiang

Cite this article:

LI Yue,ZHANG Ruiqian,YANG Ping, et al. Microstructure and mechanical properties of 2.5D curved shallow-crossing linking SiC_f/SiC composites fabricated by chemical vapor infiltration[J]. Materials Science and Engineering of Powder Metallurgy, 2018, 23(2): 167-171.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2018/V23/I2/167

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