Microstructure and mechanical properties of 2.5D curved shallow-crossing linking SiCf/SiC composites fabricated by chemical vapor infiltration
LI Yue1, ZHANG Ruiqian2, YANG Ping1, CHEN Zhaoke1, HE Zongbei2, XIONG Xiang1
1. Science and Technology on High Strength Structural Materials Laboratory, Central South University, Changsha 410083, China; 2. Science and Technolog on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, Chengdu 610213, China
Abstract:The tubular SiCf/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 SiCf/SiC composites were investigated. The results show that SiCf/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 SiCf/SiC composites is 2.50-2.58 g/cm3, and the porosity is 7.70%-9.10%. The axial compressive strength of SiCf/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
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