通过对铁铝尖晶石合成过程反应机理及MgO-Al_2O_3-FeOn三元体系中可能发生的高温反应进行热力学分析,尝试采用原位合成法制备方镁石-铁铝尖晶石材料,并用XRD、SEM等测试方法对材料进行了表征.结果表明:控制气氛10(-27117.9/T+11.54)＜Po_2＜10(-32625/T+18.09),经过1400, 1550 ℃高温处理后,能够成功合成出方镁石-铁铝尖晶石材料;同一温度下铁铝尖晶石的生成量随着金属铁加入量的增大而逐渐增多,1550 ℃处理后的试样FeAl_2O_4晶体发育更加良好.
In order to demonstrate the mechanism of hercynite synthesis reaction and other reactions in the MgO-Al_2O_3-FeO_n system, the reaction process was analyzed by thermodynamic methods. Hercynite was attempted to synthesize by in situ synthesis method from powders of the MgO, Fe, α-Al_2O_3. Then the phase composition and microstructure of sintered sample were characterized by XRD and SEM, respectively. The results indicated that: PO_2 was controlled from 10~(-27117.9/T+11.54)＜P_(o2)＜10~(-32625/T+18.09) , the temperature was kept at 1400 ℃ or 1550 ℃ for 3 h, the synthesized samples were MgO-FeAl_2O_4 materials. Hercynite increases with increment of Fe at the same temperature; heat treatment at 1550 ℃ was better.
参考文献
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