Preparation of FeCo-, FeNi- and NiCo-alloy coated cenosphere composites by heterogeneous precipitation  

作　　者：Xianfeng Meng Xiangqian Shen 

机构地区：[1]School of Materials Science and Engineering,fiangsu University,Zhenjiang 212013,China

出　　处：《Particuology》2012年第3期334-338,共5页颗粒学报（英文版）

基　　金：supported by Postdoctoral Science Foundation of China (20080431069)

摘　　要：Precursors of binary alloy （Fe112C0112, Fel/2Ni1/2, Ni1/2Co1/2, hereinafter referred to as FeCo, FeNi, NiCo） coated cenospheres were prepared by heterogeneous precipitation under optimized conditions. Magnetic binary alloy coated cenosphere composites with core-shell structure were subsequently obtained by thermal reduction of the as-prepared precursors at 700℃ for 2 h under H2/N2 atmosphere. The results showed that the alloy coatings were uniform and the binary alloy coated cenosphere composites basically retained the spherical morphology, suggesting that the thickness of the alloy coating could be adjusted to fabricate core-shell composites with multilayer structures. The composites exhibited higher coercivity than the pure alloy powders, and could therefore be used for high-performance functional materials and devices.Precursors of binary alloy （Fe112C0112, Fel/2Ni1/2, Ni1/2Co1/2, hereinafter referred to as FeCo, FeNi, NiCo） coated cenospheres were prepared by heterogeneous precipitation under optimized conditions. Magnetic binary alloy coated cenosphere composites with core-shell structure were subsequently obtained by thermal reduction of the as-prepared precursors at 700℃ for 2 h under H2/N2 atmosphere. The results showed that the alloy coatings were uniform and the binary alloy coated cenosphere composites basically retained the spherical morphology, suggesting that the thickness of the alloy coating could be adjusted to fabricate core-shell composites with multilayer structures. The composites exhibited higher coercivity than the pure alloy powders, and could therefore be used for high-performance functional materials and devices.

关 键 词：Coating materialsHeterogeneous precipitationBinary alloyCore shell structureMagnetic property 

分 类 号：TQ536.4[化学工程—煤化学工程] TB33[一般工业技术—材料科学与工程]