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Rice husk is one of the tonnage agricultural wastes produced annually. It is also one of the important sources for producing Si and Si-containing materials. In this research, rice husk ash is used for synthesis of silicon carbide. The mixture of graphite powder and rice husk ash with specific proportion was activated in a planetary ball mill, and the resulted powder, in form of a compact tablet, was subjected to microwave radiation. The amount of graphite (1.5-2.5 times of the stoichiometric amount), milling time (1-20 h) and compaction pressure (102-374 MPa) w selected as variables. The results show that microwave heating plays a remarkable role in the synthesis reaction. X-ray Diffraction (XRD) analysis of samples indicates that activated and microwave-treated samples with 1 and 4 h activation time contain no noticeable silicon carbide product, while those with 10 and 20 h activation time -SiC, an evidence for synthesis reaction. In addition, the peaksshow peaks of intensity increases with increasing activation time. It is also determined that the amount of graphite has an important role on formation of silicon carbide.

Keywords: rice husk ash, microwave heating, silicon carbide, mechanical activation

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