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Coating of Fe, Ni on α-alumina microspheres by heterogeneous precipitation

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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 and α-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 °C 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.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Jiangsu University, 212013, Zhenjiang, China

    Shen Xiang-qian (Professor), Li Dong-hong & Jing Mao-xiang

  2. Zhengzhou Research Institute, China Aluminum Corporation, 450041, Zhengzhou, China

    Li Dong-hong & Li Wang-xing

Authors
  1. Shen Xiang-qian
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  2. Li Dong-hong
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  3. Jing Mao-xiang
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  4. Li Wang-xing
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Corresponding author

Correspondence to Shen Xiang-qian.

Additional information

Foundation item: Project(50134020) supported by the National Natural Science Foundation of China; project(04CX01) supported by the Nature Science Innovative Foundation of Jiangsu University

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Shen, Xq., Li, Dh., Jing, Mx. et al. Coating of Fe, Ni on α-alumina microspheres by heterogeneous precipitation. J Cent. South Univ. Technol. 13, 22–26 (2006). https://doi.org/10.1007/s11771-006-0100-y

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  • DOI: https://doi.org/10.1007/s11771-006-0100-y

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