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通过1350~1550℃下Fe-Cr2O3、Fe2O3-Cr2O3和Fe Cr2O4的碳还原实验,结合X射线衍射和扫描电子显微镜考察不同形态铁(Fe、Fe2O3和Fe O)对Cr2O3还原的影响.同一温度下最终还原度及还原速率均呈现Fe2O3-Cr2O3-C>Fe Cr2O4-C>Fe-Cr2O3-C的趋势,三种样品的还原都经历了氧化物→碳化物→Fe-Cr-C合金的过程;低碳碳化物的产生以及较早形成金属液相使Fe2O3-Cr2O3还原更充分,合金液相中碳溶解量低导致Fe Cr2O4的还原率偏低,而碳化物偏多、合金液相偏少阻滞了Fe-Cr2O3还原率的提高.实验得到Fe-Cr2O3-C、Fe Cr2O4-C和Fe2O3-Cr2O3-C体系的表观活化能分别为142.90、111.84和128.9 k J·mol-1.
Carbon reduction of Fe-Cr2O3, Fe2O3-Cr2O3 and Fe-Cr4O4 at 1350-1550 ℃ was investigated by X-ray diffraction and scanning electron microscopy. The effect of different forms of iron (Fe, Fe2O3 and FeO) The final reducibility and reduction rate all showed the trend of Fe2O3-Cr2O3-C> Fe Cr2O4-C> Fe-Cr2O3-C. The reduction of the three samples all experienced the process of oxide → carbide → Fe-Cr- The formation of low-carbon carbides and the early formation of liquid metal phase make Fe2O3-Cr2O3 more fully. The low carbon dissolution in the liquid phase leads to the low reduction rate of Fe-Cr2O4, while the carbides are too much and the liquid phase of the alloy is less. The apparent activation energy of Fe-Cr2O3-C, Fe-Cr2O4-C and Fe2O3-Cr2O3-C systems were 142.90, 111.84 and 128.9 kJ · mol-1, respectively.