| Coating of Fe, Ni on α-alumina microspheres by heterogeneous precipitation |
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| 引用本文： | 沈湘黔,李东红,景茂祥,李旺兴.Coating of Fe, Ni on α-alumina microspheres by heterogeneous precipitation[J].中南工业大学学报(英文版),2006,13(1):22-26. |
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| 作者姓名： | 沈湘黔 李东红 景茂祥 李旺兴 |
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| 作者单位： | School of Materials Science and Engineering Jiangsu University Zhenjiang 212013 China，School of Materials Science and Engineering Jiangsu University Zhenjiang 212013 China，Zhengzhou Research Institute China Aluminum Corporation Zhengzhou 450041 China，School of Materials Science and Engineering Jiangsu University Zhenjiang 212013 China，Zhengzhou Research Institute China Aluminum Corporation Zhengzhou 450041 China |
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| 基金项目： | 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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| 摘 要： | 1INTRODUCTION Themagneticmetal coatedceramicoxides,core shellstructuralcompositematerials,inwhichthinmetallicfilmsarecoatedonaceramicoxide matrixwithmicrometerparticlesizes,areattrac tiveduetothecombinationofthefunctionalchar acteristicsofmetalsandmechanicalpropertiesoftheceramicmatrix.Theceramic basedtransition metal coated,core shellcompositessuchasNi coatedAl2O31],Fe coatedAl2O32],FeNi coated Al2O33]orCoFe coatedSiO24],havebeenfoundtoexhibitinterestingfunctionalperformancesdue…
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| 关 键 词： | 沉淀 涂层 氧化铝 微球体 镍 α-Fe |
| 文章编号： | 1005-9784（2006）01-0022-05 |
| 收稿时间： | 2005-06-10 |
| 修稿时间： | 2005-09-08 |
Coating of Fe, Ni on α -alumina microspheres by heterogeneous precipitation |
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| Shen Xiang-qian , Li Dong-hong , Jing Mao-xiang and Li Wang-xing.Coating of Fe, Ni on α -alumina microspheres by heterogeneous precipitation[J].Journal of Central South University of Technology,2006,13(1):22-26. |
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| Authors: | Shen Xiang-qian Li Dong-hong Jing Mao-xiang and Li Wang-xing |
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| Affiliation: | (1) School of Materials Science and Engineering, Jiangsu University, 212013 Zhenjiang, China;(2) Zhengzhou Research Institute, China Aluminum Corporation, 450041 Zhengzhou, China |
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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.
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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| Keywords: | heterogeneous precipitation metal-coated alumina microsphere Ni α -Fe |
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