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The effect of methane decomposition on the formation and magnetic properties of iron carbide prepared from oolitic hematite

机译：甲烷分解对由橄榄铁赤铁矿制备的碳化铁的形成和磁性的影响

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A chemical metallurgical method was used to prepare iron carbide from high phosphorus oolitic hematite in an atmosphere of H2/CH4. The relationship between the rate of methane decomposition and the iron carbide formation was discussed by using the Mossbauer spectrum to accurately determine the content change of iron carbide with time in the carburized product. Moreover, the carburized samples were characterized by transmission electron microscopy (TEM), Raman spectroscopy and X-ray diffraction (XRD), and the magnetic properties were examined by a vibrating sample magnetometer (VSM). The results show that 1023 K is the optimum temperature for iron carbide preparation from high phosphorus oolitic hematite. After deep reduction in the initial period of contact with CH4, the conversion of deposited carbon to the iron carbide rises rapidly, and then declines quickly. A polycrystalline electron diffraction analysis reveals that iron carbide, graphite and quartz are in the carburized sample. The iron carbide prepared from high phosphorus oolitic hematite in an H2/CH4 atmosphere is a soft magnetic material with relatively high magnetic properties.
机译：在H 2 / CH 4 气氛下，采用化学冶金方法由高磷橄榄岩赤铁矿制备碳化铁。小>。利用Mossbauer谱讨论了甲烷分解速率与碳化铁形成之间的关系，以准确测定渗碳产品中碳化铁的含量随时间的变化。此外，渗碳样品通过透射电子显微镜（TEM），拉曼光谱和X射线衍射（XRD）进行表征，并通过振动样品磁力计（VSM）检查了磁性能。结果表明，1023 K是高磷橄榄石赤铁矿制备碳化铁的最佳温度。在与CH 4 接触的初始阶段进行深度还原后，沉积碳向碳化铁的转化率迅速上升，然后迅速下降。多晶电子衍射分析表明渗碳样品中存在碳化铁，石墨和石英。在H 2 / CH 4 气氛中由高磷橄榄岩赤铁矿制备的碳化铁是一种软磁性材料具有较高的磁性能。

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