Abstract
Porous ZrB2/ZrC/SiC ceramics modified with SiC whiskers were successfully prepared via a sol-gel method and catalyst-assisted pyrolysis. The high porosity (85.4%) and large pore size (19.1 μm) of the porous structures enabled the in-situ growth of SiC whiskers during pyrolysis with iron as catalyst. Short and tangled SiC whiskers were observed in the interior part of the porous ZrB2/ZrC/SiC ceramics, while long and straight SiC whiskers were grown on their exterior surface. The growth of SiC whiskers followed the tip-growth model and Vapor-Liquid-Solid mechanism.
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