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


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2006-02-01

AUTHORS

Xiang-qian Shen, Dong-hong Li, Mao-xiang Jing, Wang-xing Li

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. More... »

PAGES

22-26

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s11771-006-0100-y

DOI

http://dx.doi.org/10.1007/s11771-006-0100-y

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1050146655


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