Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9636419 | Powder Technology | 2005 | 5 Pages |
Abstract
The precursors with NiCO3·2Ni(OH)2·2H2O-, Fe2O3·nH2O-, or both of NiCO3·2Ni(OH)2·2H2O- and Fe2O3·nH2O-coated alumina microspheres were prepared, respectively, by the aqueous heterogeneous precipitation using metal salts, ammonium hydro-carbonate and α-Al2O3 micropowders as the starting materials. Subsequently, magnetic metallic Ni-, α-Fe- and γ-FeNi-coated alumina core-shell structural microspheres were successfully obtained by thermal reduction of the as-prepared precursors at 700 °C for 2 h, respectively. Optimized precipitation processing parameters of the concentration of alumina micropowders (15 g/L), the rate of adding reactants (5 mL/min) and pH value were determined by a trial and error method. Powders of the precursors and the resultant metal (Ni, α-Fe, γ-FeNi alloy)-coated alumina micropowders were characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD). The experimental results show that it is possible to adjust metal coating thicknesses and fabricate multilayer structured metal/ceramics core-shell microspherical powder materials and these materials may be applied for high performance of functional materials and devices.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Xiang-qian Shen, Mao-xiang Jing, Wang-xing Li, Dong-hong Li,