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

作     者：沈湘黔 李东红 景茂祥 李旺兴 

作者机构：School of Materials Science and Engineering Jiangsu University Zhenjiang 212013 China School of Materials Science and Engineering Jiangsu University Zhenjiang 212013 ChinaZhengzhou Research Institute China Aluminum Corporation Zhengzhou 450041 China Zhengzhou Research Institute China Aluminum Corporation Zhengzhou 450041 China 

出 版 物：《Journal of Central South University of Technology》 (中南工业大学学报（英文版）)

年 卷 期：2006年第13卷第1期

页      面：22-26页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：Project(50134020)supportedbytheNationalNaturalScienceFoundationofChina project(04CX01)supportedbytheNatureScienceInnovativeFoundationofJiangsuUniversity 

主　　题：heterogeneous precipitation metal-coated alumina microsphere Ni α-Fe 

摘      要：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℃ 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.