用直流碳弧法在阳极石墨棒中加入α－Fe2O3产生碳包Fe纳米晶，研究在复合石墨棒中加入不同的Fe2O3含量对碳包Fe纳米晶的形貌、结构特性及晶粒尺寸分布的影响，探讨碳包Fe纳米晶的形成原因及碳弧法中氦气压力和Fe2O3含量对复合石墨棒所产生的碳灰的C60／70产率的影响．结果表明：Fe2O3复合石墨棒所产生的碳灰含有α－Fe相、Fe3C相和石墨相，没有氧化物相．复合阳极棒中的Fe2O3含量决定了碳包Fe纳米晶的数量和晶粒直径分布，碳弧法中的He气压力仍是影响掺Fe2O3阳极棒所产生的碳灰的C60／70产率的主要因素，但对碳包Fe纳米晶的产率影响不大.掺Fe2O3阳极棒所产碳灰的C60／70产率与氦气压力的关系和纯石墨阳极棒的这一关系比较，存在着显著的差别．
Carbon-coated Fe nanocrystals were produced by d.c. carbon arc method by using a composite anode of Fe2O3 and graphite. The investigations for the
effect of different Fe2O3 contents in the composite graphite rods on the morphology, structures and diameter distribution of graphite-encapsulated Fe nanocrystals were
carried out. X-ray diffraction of the carbon soot produced from Fe2O3-containing composite anode indicated the presence of graphite phase and α-Fe, no evidence of
Fe oxides was observed, but a small amount of Fe3C found. The effect of He pressure and Fe2O3 content on the C60/70 yield of the carbon soot produced from
composite rods was also discussed. The results show that the quantity and the diameter distribution of carbon-coated Fe nanocrystals are determined by the Fe2O3 content in
the composite anode rod. He pressures are the major factor of affecting C60/70 yield produced from Fe2O3 composite anode, but not the major factor of affecting the yields
of carbon-coated Fe nanocrystals. The relationship of C60/70 yields in the carbon soot produced from Fe2O3 composite anode and He pessure is markedly different from that
of pure graphite anode.
参考文献
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