Preparation of β-Sialon from Fly Ash by Carbothermal Reduction-Nitridation Reaction

摘要

Single phase Sialon was synthesized successfully from fly ash by carbothermal reduction-nitridation reaction in this paper. The effects of synthesizing temperature (1200℃, 1300℃, 1400℃ and 1450℃) and carbon content (stoichiometric content, exceeding 10%, 50% and 100%) on the final production were studied by XRD and SEM. Synthesis mechanism of β-Sialon was also analysized. The results indicated that single phase β-Sialon with z=3 was obtained using fly ash as raw materials and carbon black of stoichiometric content as reducer by carbothermal reduction- nitridation reaction in flow nitrogen at 1450℃ for 3h. Temperature and content of carbon had significant effect on the synthesis of β-Sialon.