caa a22 4500 463233433 CHVBK 20180405153249.0 cr unu---uuuuu 170326e20070701xx s 000 0 eng 10.1007/s10853-006-0579-5 doi (NATIONALLICENCE)springer-10.1007/s10853-006-0579-5 Microstructural characterization and fracture properties of SiC-based fibers annealed at elevated temperatures [Elektronische Daten] [J. Sha, T. Hinoki, A. Kohyama] Ceramic matrix composites (CMCs) have been proposed as potential structural materials for application of high temperature technologies. Excellent high temperature performance of CMCs requires that fibers must have high enough thermal stability and sufficient mechanical properties throughout the service life. In order to clarify the correlation between the mechanical properties and the microstructure of SiC-based fibers, SiC-based fibers were annealed at elevated temperatures in Ar for 1h. After annealing, the fracture strengths on these fibers were evaluated at room temperature by tensile test; the microstructural features were characterized by X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM). Furthermore, the fracture mechanics was applied to estimate the fracture toughness and the critical fracture energy of these fibers. As a result, excellent microstructure and mechanical stabilities were observed for SiC fibers with near-stoichiometric composition and high-crystallite structure. Combining the microstructure examination with tensile test indicates that the thermal and mechanical stabilities of SiC fibers at high temperatures were mainly controlled by their crystallization and composition as well as other factors. Springer Science+Business Media, LLC, 2007 Sha J. International Innovation Center, Kyoto University, Sakyo-ku, 606-8501, Kyoto, Japan aut Hinoki T. Institute of Advanced Energy, Kyoto University, Gokasho, Uji, 611-0011, Kyoto, Japan aut Kohyama A. Institute of Advanced Energy, Kyoto University, Gokasho, Uji, 611-0011, Kyoto, Japan aut Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/13(2007-07-01), 5046-5056 0022-2461 42:13<5046 2007 42 10853 https://doi.org/10.1007/s10853-006-0579-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-006-0579-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Sha J. International Innovation Center, Kyoto University, Sakyo-ku, 606-8501, Kyoto, Japan aut NATIONALLICENCE 700 1- Hinoki T. Institute of Advanced Energy, Kyoto University, Gokasho, Uji, 611-0011, Kyoto, Japan aut NATIONALLICENCE 700 1- Kohyama A. Institute of Advanced Energy, Kyoto University, Gokasho, Uji, 611-0011, Kyoto, Japan aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/13(2007-07-01), 5046-5056 0022-2461 42:13<5046 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer