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Microstructure and mechanical properties of SiC f /SiC-AlN composites prepared by low temperature reactive melt infiltration
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| 【文章作者】Sun, Xiaofan;Chen, Xiaowu;Huang, Hui;Jin, Xihai;Kan, Yanmei;Yang, Jinshan;Hu, Jianbao;Liao, Chunjing;Liu, Ning;Dong, Shaoming |
| 【文章摘要】 In this work, SiCf/SiC-AlN f /SiC-AlN composites were fabricated by low temperature reactive melt infiltration of Si-Al alloy into porous SiCf/C-Si3N4 f /C-Si-3 N-4 preforms prepared through slurry brushing. The effect of the preforms pore structure on the melt infiltration was studied, and the erosion behaviors of Si-Al alloy melt on the fibers and the interphases were investigated. The results indicate that the preforms with smaller pore size can hinder the alloy melt infiltration, making it difficult for the infiltration process to proceed adequately. In contrast, when the preforms with larger pore size are utilized, the alloy melt can completely infiltrate into the preforms and form dense SiC-AlN matrix in the intra-fiber bundle by in-situ reaction. Moreover, the bending strength of the composites derived from larger pore size preforms could reach 160.2 MPa, which is about 1.5 times higher than that of the composites derived from smaller pore size preforms. In addition, the damage of the SiC interphase caused by the preforms preparation aggravates the erosion of the internal BN interphase and SiC fibers by Al melt. The eroded interphases and fibers could adversely affect the mechanical properties of both composites. This study lays the foundation for the preparation of the composites with excellent properties. |
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【卷】【ISSUE】【ISSUEID】
【文章期份】2024
【发布日期】2025/5/13 10:04:18
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