Abstract
AbstractSilica‐bonded porous SiC ceramics were fabricated using nano‐β‐SiC powder‐carbon black template compacts by sintering in air at 600°C‐1200°C. The intrinsic microstructures of the porous ceramics were characterized by high‐resolution transmission electron microscopy, which led to the following observations: (a) a core (SiC)‐shell (SiO2) structure was formed, owing to the partial oxidation of nano‐SiC particles during sintering; (b) a low‐temperature (800°C) β‐to‐α polytypic phase transformation was observed, owing to the oxidation‐induced residual thermal stresses; and (c) non‐graphitic carbons were precipitated inside the SiC core, owing to the segregation of C atoms emitted at the strained SiC‐SiO2 interface.
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