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氮气气氛下铁铝尖晶石的合成

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Abstract:

烧结法合成铁铝尖晶石需要控制适当的气氛,以保证氧化亚铁(FeO)处在其稳定存在温度与氧分压条件下。以往通过对不同氧分压下Fe2O3-Al2O3相图以及1500℃时FeO-Fe2O3-Al2O3三元系统等温截面图的分析,说明氧分压越低越有利于铁铝尖晶石的合成,而且Fe3O4与FeAl2O4的固溶度随着氧分压降低以及铁铝尖晶石含量增加迅速降低。热力学计算表明在氧分压为0.5Pa高纯氮气气氛条件下,FeO在1473~2160℃范围内能够稳定存在,在此温度范围烧结可以合成铁铝尖晶石。实验证明以Fe2O3粉和Al2O3粉为原料,配料时需要引入一定量还原碳粉以消耗Fe2O3分解产生的氧气,当烧结温度高于1500℃时,所有的铁源都转化为铁铝尖晶石相。由于烧结温度较高,目前仅限于实验室合成。

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