ABSTRACT
Silicon carbide (SiC) fibers have been promising candidates for reinforcement materials for composites in the fields of high-temperature structural materials, and also in the case of first generation and second generation, they have been promising as insulation materials in high-temperature furnaces. This chapter addresses high-temperature properties of SiC-based ceramic fibers. It explains oxidation stability of SiC-based fiber aiming for insulator applications. The average emissivity of the exposed fiber felt having 5–6 µm oxide layer thickness was 92.5%, and quite similar to the value of the unexposed fiber felt. SiC-polycrystalline fiber (Tyranno SA) shows excellent heat resistance and oxidation resistance compared with amorphous SiC fibers. It is because Tyranno SA is composed of perfectly SiC-sintered structure. The creep resistance of Hi-Nicalon Type S with larger diameter (14 µm) was almost the same as that of Tyranno SA with smaller diameter.
