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    Core–shell SiCw@TiC composite whisker-reinforced Al2O3 ceramics: Preparation, properties, and toughening mechanisms

    Access Status
    In process
    Authors
    Li, Weixing
    Pang, Huijuan
    Zhang, Zhixiao
    Cheng, Liyuan
    Wang, Yafeng
    Zhang, Xiaoliang
    Mu, Jingbo
    Dong, Roger
    Wang, Yanming
    Zhang, Xiaorong
    Date
    2025
    Type
    Journal Article
    
    Metadata
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    Citation
    Li, W. and Pang, H. and Zhang, Z. and Cheng, L. and Wang, Y. and Zhang, X. and Mu, J. et al. 2025. Core–shell SiCw@TiC composite whisker-reinforced Al2O3 ceramics: Preparation, properties, and toughening mechanisms. Journal of Advanced Ceramics. 14 (6): pp. 1-9.
    Source Title
    Journal of Advanced Ceramics
    DOI
    10.26599/JAC.2025.9221093
    Additional URLs
    https://www.sciopen.com/article/10.26599/JAC.2025.9221093
    ISSN
    2226-4108
    Faculty
    Faculty of Science and Engineering
    School
    School of Civil and Mechanical Engineering
    URI
    http://hdl.handle.net/20.500.11937/98024
    Collection
    • Curtin Research Publications
    Abstract

    In this study, we propose a novel approach to increase the fracture toughness of Al2O3 ceramics by incorporating core–shell structural composite whiskers as secondary phases. In particular, Al2O3 composite ceramics reinforced with TiC-coated SiC whiskers (SiCw@TiC) were successfully fabricated through a combination of molten salt synthesis and spark plasma sintering (SPS). The SiCw@TiC whiskers feature a SiCw core and a TiC shell layer (~85 nm thick) composed of nano-sized TiC grains. Remarkably, the core–shell structure is preserved within the Al2O3 matrix after sintering, forming a unique composite toughening phase. The interfacial regions surrounding the whiskers exhibit a complex geometric configuration and multi-dimensional heterogeneities, including variations in phase composition (Al2O3/SiC/TiC), grain size (micron-/nano-scale), and thermal expansion coefficient (3.8×10−6–7.4×10−6/K), which collectively generate a sophisticated stress field. This intricate microstructure enables the SiCw@TiC whiskers to dissipate crack propagation energy through multiple mechanisms, significantly improving the fracture toughness of the Al2O3 matrix. The resulting Al2O3–SiCw@TiC composite ceramics demonstrate exceptional mechanical properties, with a relative density of 99.16%±0.48%, Vickers hardness of 21.38±0.93 GPa, flexural strength of 693±49 MPa, and fracture toughness of 7.15±0.47 MPa·m1/2. This work establishes a paradigm for structural ceramic toughening through engineered core–shell architectures.

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