自然科学版 英文版
自然科学版 英文版
自然科学版 英文版

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中南大学学报(英文版)

Journal of Central South University

Vol. 13    No. 1    February 2006

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Coating of Fe, Ni onα-alumina microspheres
by heterogeneous precipitation
SHEN Xiang-qian(沈湘黔)1, LI Dong-hong(李东红)1,2,
JING Mao-xiang(景茂祥)1, LI Wang-xing(李旺兴)2

1. School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China;
2. Zhengzhou Research Institute, China Aluminum Corporation, Zhengzhou 450041, China

Abstract:The precursors with NiCO3·2Ni(OH)2·2H2O, Fe2O3·nH2O coated alumina microspheres were prepared by the aqueous heterogeneous precipitation using metal salts, ammonium bicarbonate andα-Al2O3 micropowders as the starting materials. Magnetic metal Ni,α-Fe coated alumina, core-shell structural microspheres were successfully obtained by thermal reduction of the precursors at 700℃for 2 h, respectively. Powders of the precursors and the resultant metal (Ni,α-Fe) coated alumina micropowders were characterized by scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction. The results show that optimized precipitation parameters are concentration of alumina micropowders of 15 g/L, rate of adding reactants of 5 mL/min and pH value of 7.5. And under the optimized conditions, the spherical precursors without aggregations or agglomerations are obtained,then transferred into Ni,α-Fe coated alumina microspheres by thermal reduction. It is possible to adjust metal coating thicknesses and fabricate a multilayer structured metal/ceramics, core-shell microspherical powder materials.

 

Key words: heterogeneous precipitation; metal-coated alumina microsphere; Ni;α-Fe

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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