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| Study on Synthesis of Silicon Nitride Powders From Iron Ore Tailings |
| ZHANG Shuhui1,2,XUE Xiangxin2,L Qing1,HUANG Dawei2 |
| 1. College of Metallurgy and Energy, Hebei Polytechnic University, Tangshan 063009, Hebei, China; 2. School of Materials and Metallurgy, Northeastern University, Shenyang 110004, Liaoning, China |
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Abstract Based on thermodynamic analysis, Si3N4 powders were synthesized by carbothermal reduction and nitridation from iron ore tailings and carbon black as raw materials. Phase composition and microstructure of products were determined by Xray diffraction (XRD) and scanning electron microscopy.For reaction temperature 1450 ℃, holding time 8 h, and N2 flow 600 mL/min, the effect of molar ratio of C and SiO2 on synthesis was studied. The results show that the molar ratio of C and SiO2 affects the synthesis process significantly, and the optimal ratio was 2. When the molar ratio was less than 2 Si3N4 phase in the product increased rapidly with the increase of molar ratio;When this molar ratio was more than 2 Si3N4 phase decreased while SiC phase rised with the increase of molar ratio. The favorable Si3N4 crystal mostly existed as equiaxed columnar or short rodlike βSi3N4 when the molar ratio was 2.
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Received: 01 January 1900
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2008, Vol. 43 
