Abstract
The silica layer present on the surface of SiC fibers and whiskers plays an important role in the fabrication and application offiber-and whisker- reinforced ceramics. Degradation of the SiCfibersin the composites takes place in the presintering stage during which the surface silica isremovedas SiO (g) and thefibersare exposed to further oxidation. Rapid heat-treatment in the presintering stage is therefore essential to minimize fiber damage. SiC whiskers, however, contain only a small amount of silica on the surface and are susceptible to further oxidation during the sintering of the composites. In addition, SiC whiskers undergo degradation in air at temperatures above 1000 °C by losing material from the core.
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