1. Nanchang Cemented Carbide Limited Liability Company, Nanchang 330013, China; 2. School of Materials Science and Engineering, Nanchang University, Nanchang 330031, China; 3. Institute of Applied Physics, Jiangxi Academy of Sciences, Nanchang 330028, China
Abstract：Three kinds of percursors powders including single phase CaFe2O4, single phase CaFe2O4 and mixed phase Ca2Fe2O5/CaO were prepared by calcine using CaO and Fe2O3 as raw materials. Nanometer Fe powders were prepared by reducing percursors powders under hydrogen. The effects of the type of percursors on the reducing temperature, the morphology and particle size of Fe powders were studied. The formation mechanism of spherical nanometer Fe powders prepared by reducing calcium ferrite was discussed. The results show that the reducing temperature increases, the particle size of Fe powders decreases and the morphology of Fe powders change from irregular to sphere, with increasing the ratio of CaO. The spherical Fe powders with the average particle size of 34 nm are obtained by reducing Ca2Fe2O5/CaO percursor at 950 ℃ under hydrogen, the particle size distribution is uniform and the didpersity is good. The CaO plays a role in dispersing and promoting the nucleation of Fe powder in the preparation of nano Fe powder.
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2018, Vol. 23 
