Synthesis of SiC Macroscopic Spheres from Fly Ash

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Abstract:

SiC macroscopic spheres have been synthesized by a microwave heating and carbothermal reduction method with commercial carbon spheres as template and fly ash as silica source. The morphology and structure of SiC hollow spheres were characterized using X-ray diffraction, N2 adsorption isotherms, scanning electron microscope and energy-dispersive. The results show that the SiC hollow spheres have retained the similar size with the original carbon sphere template. The shell of SiC hollow sphere is composed of curving SiC wires, and the shell thickness can be modulated by the ratio between C and SiO2. The formation of curving SiC wires attribute to the VLS mode, the Fe catalyst is indispensable reason of it.

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589-593

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January 2012

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