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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摘要采用化学气相渗透(chemical vapor infiltration, CVI)方法,在具有2.5D 浅交弯联结构的SiC纤维管状编织体上预沉积SiC-PyC-SiC多层界面(PyC即Pydrolytic carbon,热解碳),再利用CH₃SiCl₃-H₂-Ar体系对其进行化学气相渗透SiC增密,制备管状SiC_f/SiC复合材料,研究SiC_f/SiC复合材料的物相组成、微观结构、轴向压缩、径向压溃以及环向拉伸等力学性能及其断口形貌。结果表明：SiC_f/SiC复合材料主要由SiC纤维、SiC-PyC-SiC复合界面以及SiC基体组成。SiC-PyC-SiC 复合界面中,PyC界面厚度为400~500 nm,SiC界面厚度为700~800 nm,SiC基体主要为β-SiC相。SiC_f/SiC复合材料的密度为2.50~2.58 g/cm³,开孔率为7.70%~9.10%,轴向抗压强度为53.2 MPa,径向压溃强度为38.18 MPa。轴向压缩时表现为与水平方向成 45°方向的剪切破坏,径向压溃时表现为形成4个塑性铰后发生分瓣破坏,断口处明显观察到纤维拔出现象,但拔出不长,表现出“假塑性”特征。SiC_f/SiC复合材料的环向抗拉强度为12.8 MPa,其断口相对较平整,纤维拔出不明显,表现为脆性破坏。

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	李月
	张瑞谦
	杨平
	陈招科
	何宗倍
	熊翔

关键词 ：化学气相渗透, SiC_f/SiC复合材料, 微观结构, 压缩, 压溃, 环向拉伸

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

收稿日期: 2017-07-07 出版日期: 2019-07-12

ZTFLH:

TB332

基金资助:湖南省科技计划资助项目(2015WK3013); 反应堆燃料及材料重点实验室基金资助项目; 一院高校联合创新基金资助项目; 中南大学粉末冶金国家重点实验室资助项目

通讯作者: 陈招科,副研究员,博士。电话：13187015470;E-mail: chenzhaoke2008@csu.edu.cn

引用本文:

李月, 张瑞谦, 杨平, 陈招科, 何宗倍, 熊翔. 化学气相渗透法制备2.5D浅交弯联SiC_f/SiC复合材料的结构与力学性能[J]. 粉末冶金材料科学与工程, 2018, 23(2): 167-171.
LI Yue, ZHANG Ruiqian, YANG Ping, CHEN Zhaoke, HE Zongbei, XIONG Xiang. Microstructure and mechanical properties of 2.5D curved shallow-crossing linking SiC_f/SiC composites fabricated by chemical vapor infiltration. Materials Science and Engineering of Powder Metallurgy, 2018, 23(2): 167-171.

链接本文:

http://pmbjb.csu.edu.cn/CN/ 或 http://pmbjb.csu.edu.cn/CN/Y2018/V23/I2/167

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