Abstract
SiC coated graphites were prepared via a catalytic conversion method, employing graphite flakes and silicon powder as the starting materials, and Fe, Co and Ni as catalysts, respectively. The effects of firing temperature and various kinds of catalyst on the growth and morphologies of SiC coating on graphite surface were evaluated. Density functional theory (DFT) calculations revealed that the catalytic role of catalysts on the formation of SiC could be attributed to the occurrence of chemisorption between CO (g) molecule and catalysts owing to charge transfer effects. The graphites.coated with SiC displayed better oxidation resistance and water wettability than uncoated graphites. Also, mechanical strength, thermal shock resistance, slag resistance and oxidation resistance of a model of Al2O3-C castables containing coated graphites were better than its uncoated counterparts.
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