Enchanced high-temperature performances of SiC/SiC composites by high densification and crystalline structure |
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Authors: | Kazuya Shimoda Tatsuya HinokiHirotatsu Kishimoto Akira Kohyama |
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Affiliation: | a Institute of Advanced Energy, Kyoto University, Gokasho Uji, Kyoto 611-0011, Japan b DEN/DANS/DMN/SRMA, CEA-Saclay, Gif-sur-Yvette Cedex 91191, France c OASIS, Muroran Institute of Technology, 27-1 Mizumoto-cho, Muroran 050-8585, Japan |
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Abstract: | We report the enchanced in situ performances of tensile strength and thermal conductivity at elevated temperatures of the PCS-free SiC/SiC composite with a high fiber volume fraction above 50% fabricated by NITE process for nuclear applications. The composite was fabricated by the optimized combination of the fiber coating, the matrix slurry and the pressure-sintering conditions, based on our previous composites’ study history. The composite showed the excellent tensile strength up to 1500 °C, that it retained approximately 88% of the room-temperature strength. Also, the thermal conductivity of the composites represented over 20 W/m K up to 1500 °C, which was enough high to take the advantage of the assumed design value for nuclear applications. Microstructural observation indicated that the excellent high-temperature performances regarding tensile strength and thermal conductivity up to 1500 °C were the contribution to the high densification and crystalline structure in matrix. |
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Keywords: | A. Ceramic-matrix composites (CMCs) B. High-temperature properties B. Thermal properties B. Thermo-mechanical properties D. Scanning/transmission electron microscopy (STEM) |
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