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

  • Shen Xiang-qian Email author
  • Li Dong-hong 
  • Jing Mao-xiang 
  • Li Wang-xing 
Article

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.

Key words

heterogeneous precipitation metal-coated alumina microsphere Ni α-Fe 

CLC number

TF123 TB33 

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Copyright information

© Central South University 2006

Authors and Affiliations

  • Shen Xiang-qian 
    • 1
    Email author
  • Li Dong-hong 
    • 1
    • 2
  • Jing Mao-xiang 
    • 1
  • Li Wang-xing 
    • 2
  1. 1.School of Materials Science and EngineeringJiangsu UniversityZhenjiangChina
  2. 2.Zhengzhou Research InstituteChina Aluminum CorporationZhengzhouChina

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