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Synthesis of bamboo-like SiC whiskers from waste silica fume

Articles

Journal/Conference:

CRYSTAL RESEARCH AND TECHNOLOGY

Language:

English

Author:

Li Qingcui; Wang ChangAn; Tie Shengnian

Year:

2014

Volume:

49

Issue:

5

Pages:

290-297

Keywords:

carbothermal reduction; silicon carbide whiskers; silica fume; vapor-solid mechanism

A process for the utilization of wasted silica fume is proposed in this work. Silicon carbide (SiC) whiskers several tens of micrometers in length and with a bamboo-like morphology have been successfully synthesized by a carbothermal reduction process using purified silica fume as the silicon source. The morphology and structure of SiC whiskers were investigated by X-ray diffraction, Raman spectroscopy, scanning electron microscopy, and high-resolution transmission electron microscopy. Studies found that the as-synthesized whiskers were grown as single-crystalline -SiC along the (111) growth direction. The whiskers consisted of hexagonal stems randomly decorated with larger-diameter knots along their whole length. On the basis of the characterization results, a vapor-solid process was discussed as a possible growth mechanism of the -SiC whiskers.