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Influence of CVI process time on the C-ring strength of hybrid SiCf/SiC composites fabricated by CVI–LSI

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Abstract

The C-ring strength behavior and the microstructural evolution of SiCf/SiC composite tubes fabricated using a hybrid method of chemical vapor infiltration (CVI) and liquid silicon infiltration (LSI) were investigated. The CVI and LSI composites were individually fabricated and compared with the properties of hybrid composites. The additional LSI process improved the mechanical strength and density of the composites. The short CVI time composites had sufficient inter-bundle voids for densification, but free Si and carbon prepreg remained in the microstructure. The hybrid composites saw C-ring strength increase by 30–50% in the short CVI time composites, and the density was improved versus the properties of a single CVI or LSI process. This work can provide guidance for the optimization of processing SiCf/SiC hybrid composites and mechanical properties in the structural design of ceramic matrix composites.

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Acknowledgements

This work was supported by a Korea Evaluation Institute of Industrial Technology (KEIT) grant funded by the Korean government (MTIE; No. 20011308 and No. 20020861).

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Authors and Affiliations

  1. School of Materials Science & Engineering, Seoul National University, Seoul, 08826, Korea

    Jangwon Han & Chan Park

  2. Materials Safety Technology Development Division, Korea Atomic Energy Research Institute, Daejeon, 34057, Korea

    Jangwon Han, Daejong Kim, Weon-Ju Kim & Ji Yeon Park

  3. Energy Materials Laboratory, Korea Institute of Energy Research, Daejeon, 34129, Korea

    Se-young Kim

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  1. Jangwon Han
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Han, J., Kim, D., Kim, Sy. et al. Influence of CVI process time on the C-ring strength of hybrid SiCf/SiC composites fabricated by CVI–LSI. J. Korean Ceram. Soc. 60, 261–271 (2023). https://doi.org/10.1007/s43207-022-00260-7

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