| Influence of CVI process time on the C-ring strength of hybrid SiCf/SiC composites fabricated by CVI–LSI |
| Jangwon Han1,2, Daejong Kim2, Se-young Kim3, Weon-Ju Kim2, Chan Park1, Ji Yeon Park2 |
1School of Materials Science & Engineering, Seoul National University, Seoul 08826, Korea
2Materials Safety Technology Development Division, Korea Atomic Energy Research Institute, Daejeon 34057, Korea
3Energy Materials Laboratory, Korea Institute of Energy Research, Daejeon 34129, Korea |
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Received: July 7, 2022; Revised: October 22, 2022 Accepted: October 27, 2022. Published online: November 10, 2022. |
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| ABSTRACT |
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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. |
| Key words:
SiC · Composite · CVI · LSI · C-ring |
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