In situ monitoring of the mechanical and electrical property changes of amorphous Si–Al–C–O fibers during heating to 1900 °C and correlation of these changes with the accompanying structural and crystallinity changes

Kazuya Shimoda; Christian Colin

doi:10.1016/j.jeurceramsoc.2024.116889

ジャーナル論文 In situ monitoring of the mechanical and electrical property changes of amorphous Si–Al–C–O fibers during heating to 1900 °C and correlation of these changes with the accompanying structural and crystallinity changes

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Kazuya Shimoda, Christian Colin. In situ monitoring of the mechanical and electrical property changes of amorphous Si–Al–C–O fibers during heating to 1900 °C and correlation of these changes with the accompanying structural and crystallinity changes. Journal of the European Ceramic Society. 2024, 45 (2), 116889. https://doi.org/10.1016/j.jeurceramsoc.2024.116889

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(abstract)

Although SiC fibers are promising reinforcement materials for applications in high-temperature environments, the effects of heating on the thermomechanical and thermoelectrical properties of these fibers have not been discussed and correlated with the associated microstructural changes. To bridge this gap, we herein in situ monitored the elastic modulus and electrical conductivity changes accompanying the conversion of single amorphous Si–Al–C–O fibers to Si–Al–C polycrystalline fibers during heating to up to 1900 °C in vacuum using an in-house-built device. The weight and tensile strength changes due to heating at 1200–1900 °C in vacuum were correlated with the concomitant fiber crystallinity and microstructural changes. The mechanical and electrical properties of the fibers were related to the porous structure formed by the decomposition of the amorphous SiCxOy phase, rigid structure bonded by nanograin sintering–induced grain growth, and carbon layer formed by Si sublimation from the fiber surface.

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