Abstract
This paper presents a new technique for synthesizing porous silicon carbide (SiC) ceramics with a biomorphic microstructure through the molten salt reaction of a carbon template/silicon composite under a static argon atmosphere. The effects of varying the sintering temperature (1200 to 1400°C) and corresponding holding time on the pore size distribution of the obtained ceramics is investigated, and the biomorphic cellular morphology of the residual carbon template in the porous β-SiC ceramic is analysed for the presence of α-SiC. The results reveal that the formation of SiC starts at about 1250°C, at which point SiC exists as nanowires in the cellular pores of the carbon template. This unique hierarchical morphology is determined to be influenced by the molten salt media.
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