材料科学
复合材料
体积分数
原位
断裂(地质)
纤维
图层(电子)
体积热力学
碳纤维
复合数
量子力学
物理
气象学
作者
Yucong Wei,Fang Ye,Laifei Cheng,Litong Zhang,Jinsong Yang
标识
DOI:10.1016/j.jeurceramsoc.2022.11.012
摘要
Unidirectional SiC f /SiC composites (UD SiC f /SiC composites) with excellent mechanical properties were successfully fabricated by a modified PIP method which involved the preparation of film-like matrix containing carbon layer with a low concentration PCS solution followed by the rapid densification of composites with a high concentration PCS solution. Carbon layers were in-situ formed and alternating with SiC layers in the as-received matrix. The unique microstructure endows the composites with appropriate interfacial bonding state, good load transfer ability of interphase and matrix and load bearing ability of fiber, and great crack deflection capacity, which ensures the synergy of high strength and toughness of composites. It is also found that the fiber volume fraction in the preform makes a non-negligible effect on the distribution of interphase and matrix, of which the reasonable adjustment can be utilized to optimize the mechanical properties of composites. Compared with the composites only using high concentration PCS solution, the UD SiC f /SiC composites prepared by the modified PIP method exhibit superior mechanical properties. Ultrahigh flexural strength of 1318.5 ± 158.3 MPa and fracture toughness of 47.6 ± 5.6 MPa·m 1/2 were achieved at the fiber volume fraction of 30%.
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