LI Junyi, WANG Junkai, HAN Lei, TIAN Liang, ZHANG Haijun

(The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081,Hubei, China)

Abstract: β-SiC nano-powders were synthesized at 1250 ℃ for 3 h under Ar atomosphere via carbonization reaction method using silicon powders and phenolic resin as raw materials, and ferric nitrate as a catalyst precursor. The effects of catalyst content, temperature and holding time on the preparation of the SiC powders were investigated. XRD, EDS, TEM and SEM were used to characterize the final samples. The results indicated that: (1) β-SiC can be synthesized at 1250 ℃ for 3 h with 1.5 wt.% Fe as catalysts. In contrast, for the sample without Fe catalysts, the formation temperature of phase pure SiC is 1350 ℃; (2) Most of the prepared β-SiC were granular in morphology, and it’s average particle size is about 60 nm.

Key words: β-SiC; powders; catalytic carbonization reaction