Effect of SiC fiber preforms structure on densification and mechanical properties of SiCf/BN/SiC composites

doi:10.19936/j.cnki.2096-8000.20240528.009

Abstract

Abstract: In order to study the effect of silicon carbon (SiC) fiber preform structure on the densification process of SiC matrix by chemical vapor deposition (CVI) process, the pore structure evolution of SiC preform with 2D, 2.5D and 3D structures during the densification process was analyzed using simulation method; and SiC_f/BN/SiC composites with three kinds of SiC fiber preform structures were prepared by CVI process using boron trichloride-ammonia-hydrogen-nitrogen (BCl₃-NH₃-H₂-N₂)and trichloromethylsilane-hydrogen (MTS-H₂) gas mixture as precursor. The results show that the densification efficiency of SiC_f/BN/SiC composites varies with SiC fiber preforms structure. The densification rate of 2.5D preform and 3D preform is the fastest and the slowest, respectively. After 120 h, the density of three kinds of structure SiC_f/BN/SiC composites was more than 2.3 g/cm³ and the porosity was about 10%. The tensile strength of the three kinds of SiC_f/BN/SiC composites was 130~170 MPa. In the process of interlaminar shear, 2D SiC_f/BN/SiC composites and 2.5D SiC_f/BN/SiC composites showed fiber stripping in XY plane, while 3D SiC_f/BN/SiC composites showed the highest interlaminar shear strength and the fracture of orthogonal Z-direction fibers occurred. Therefore, the densification process and mechanical properties of the composite were affected by the SiC fiber preform structure.

Key words: SiC fiber, preform structure, SiC matrix, CVI, densification, composites, mechanical properties

CLC Number:

TB332

WANG Mengqian, JIA Lintao, LI Aijun, PENG Yuqing. Effect of SiC fiber preforms structure on densification and mechanical properties of SiC_f/BN/SiC composites[J]. COMPOSITES SCIENCE AND ENGINEERING, 2024, 0(5): 58-65.

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Effect of SiC fiber preforms structure on densification and mechanical properties of SiC_f/BN/SiC composites

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