摘要
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 graphiteencapsulated 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.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
1999年第2期291-296,共6页
Journal of Inorganic Materials
基金
广东省自然科学基金!960097
广东省高教厅重点科研资助!!970024
关键词
碳包铁纳米晶
碳弧法
碳微团
铁粉
carbon-coated Fe nanocrystals,carbon arc method,C_(60/70)
