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对淤泥沙原料中Fe3O4及其中间产物Fe O和Fe可能参与的反应进行了热力学分析.结合绘制的不同CO分压下Fe-Si体系在C和Si O2过量下的优势区相图及Fe-O-N体系热力学参数状态图,得出体系中Fe元素最终以Fe3Si形式存在,为淤泥沙合成O’-Sialon-Si C-Fe3Si(即Fe-Sialon)复合材料提供了热力学理论依据.在热力学分析的基础上,以淤泥沙为主要原料,采用碳热还原氮化法制备了Fe-Sialon复合材料,并借助X射线衍射仪和扫描电子显微镜对烧结体的物相和显微形貌进行了表征,得出产物的主晶相为O’-Sialon,还含有少量的Si C和Fe3Si相,晶粒呈现为纤维状、絮状或短柱状,与热力学分析结果(Fe元素最终以Fe3Si存在)吻合.
Thermodynamic analysis of the possible reactions of Fe 3 O 4 and its intermediate products FeO and Fe in the silt silt raw material was carried out.Combined with the plot of the dominant region of the Fe-Si system with excess C and Si 2 O under different CO partial pressure, ON system thermodynamic parameters of the state diagram, concluded that the system of Fe in the final form of Fe3Si form, for the synthesis of silt sand O’-Sialon-Si C-Fe3Si (ie Fe-Sialon) composite material provides a thermodynamic theoretical basis in the thermodynamic analysis Based on the siliceous sand as the main raw material, the Fe-Sialon composite was prepared by carbothermal reduction nitridation method. The phase and the micro-morphology of the sintered body were characterized by X-ray diffraction and scanning electron microscopy. The main crystal phase of the product was found to be O’-Sialon with a small amount of SiC and Fe3Si phases. The grains appeared fibrous, flocculent or short columnar shape, which was in good agreement with the results of thermodynamic analysis (the final Fe element was Fe3Si).