SiC fiber reinforced Si3N4 composites (SiCf/Si3N4) were prepared by chemical vapor infiltration, and the mechanical properties were optimized by tailoring the BN interphase thickness. The microstructure was characterized by transmission electron microscope and scanning electron microscope, and the evolution of mechanical properties was revealed by the finite element analysis. The results show that with the increase of BN interphase thickness from 290 to 550 nm, the flexural strength is increased from (190±39)MPa to (317±28)MPa, the fracture toughness is increased from (7.3±1.6)MPa·m1/2 to (14.7±0.5)MPa·m1/2, and the tensile strength is increased from (89±3)MPa to (176±17)MPa. The residual stress of the fiber decreases rapidly with the increase of BN interphase thickness, and the thermal mismatch is effectively alleviated, which makes the material show better mechanical properties.


    Access

    Download


    Export, share and cite



    Title :

    Interphase optimization of SiCf/Si3N4 composites


    Contributors:
    DENG Yangfang (author) / CHEN Xu (author) / WANG Tongtong (author) / FAN Xiaomeng (author)


    Publication date :

    2023




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    Unknown




    Research progress of BN interphase and its multilayers in SiCf/SiC composites

    LYU Xiaoxu / QI Zhe / ZHAO Wenqing et al. | DOAJ | 2019

    Free access


    Performance of SiC whisker reinforced SiCf/SiC composites fabricated by PIP

    JIANG Zhuoyu / LYU Xiaoxu / ZHOU Yiran et al. | DOAJ | 2021

    Free access

    Water-oxygen corrosion resistance behavior of SiCf/SiC composites prepared by different processes

    YANG Jinhua / DING Ning / LIU Wei et al. | DOAJ | 2024

    Free access

    Effect of Fabric Preform Structure on Mechanical Properties of SiCf/PyC/SiBCN Composites

    TAN Xi / LIU Wei / CAO Lamei et al. | DOAJ | 2017

    Free access