Effect of Intrinsic Structure on Stability of Domestic SiC Fiber

Abstract

Abstract The morphology, structure and composition of three different SiC fibers were studied by SEM, XRD and elemental analysis techniques in this paper. The high temperature stability of SiC fiber bundles was also characterized. The results show that the intrinsic structure of domestic first, second, and third generation silicon carbide fibers possesses large differences. The above three fibers can be classified into high oxygen high carbon, low oxygen high carbon and near stoichiometric ratio according to the composition, and classified into amorphous, low crystallinity and high crystallinity according to the structure. The difference in composition and structural characteristics of the above fibers has a great influence on the comprehensive properties of SiC fibers, especially the oxidation resistance. The high temperature oxidation resistance of the first, second and third generation SiC fibers increases gradually, which provides material basis and technical support for the preparation of ceramic matrix composites suitable for hot end components of aero-engines with different thrust-weight ratios.