2Fe14B;磁粉"/> 2Fe14B的NdFeB磁粉。采用X射線衍射(XRD)、透射電鏡(TEM)及附帶的X射線能譜儀(EDS)、差示掃描量熱法(DSC)和振動(dòng)樣品磁強(qiáng)計(jì)(VSM)等表征手段對(duì)樣品物相組成、微觀組織結(jié)構(gòu)、不同溫度的相變和磁性能進(jìn)行了分析,研究了Nd2Fe14B相的形成過程。結(jié)果表明：采用化學(xué)法成功合成了分散良好的納米尺寸的NdFeB中間體,中間體由球狀Fe3O4顆粒和絮狀物的Nd、B元素有機(jī)物配位體組成；中間體經(jīng)過兩級(jí)退火轉(zhuǎn)變?yōu)镹dFeB磁粉。一級(jí)還原退火使NdFeB中間體轉(zhuǎn)化成NdFeO3、B2O3、Nd2O3和α-Fe；二級(jí)還原退火在CaH2輔助下的反應(yīng)過程：首先B2O3在501 ℃下被還原成B,接著678 ℃時(shí),Nd2O3和NdFeO3被還原以形成NdH2和α-Fe相,最后895 ℃時(shí),B、NdH2和α-Fe發(fā)生合金化反應(yīng)形成Nd2Fe14B磁粉。"/>

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化學(xué)法制備Nd2Fe14B磁粉及其反應(yīng)過程
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沈陽工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院,東北大學(xué) 材料各向異性與織構(gòu)教育部重點(diǎn)實(shí)驗(yàn)室,沈陽工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院,東北大學(xué) 材料電磁過程研究教育部重點(diǎn)實(shí)驗(yàn)室,東北大學(xué) 材料各向異性與織構(gòu)教育部重點(diǎn)實(shí)驗(yàn)室

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TQ586.1

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國(guó)家自然科學(xué)基金資助(項(xiàng)目號(hào)51401130,51471048)


Preparation and Reaction Process of Nd2Fe14B Magnetic PowderSynthesized by Chemical Method
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School of Materials Science and Engineering,Shenyang University of Technology,Key Laboratory for Anisotropy and Texture of Materials,Ministry of Education,Northeastern University,School of Materials Science and Engineering,Shenyang University of Technology,Key Laboratory of Ministry of Education for Electromagnetic Processing of Materials, Shenyang,Key Laboratory for Anisotropy and Texture of Materials,Ministry of Education,Northeastern University

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    摘要:

    利用化學(xué)法制備NdFeB中間體,再通過兩級(jí)還原退火成功制備了主相為Nd2Fe14B的NdFeB磁粉。采用X射線衍射(XRD)、透射電鏡(TEM)及附帶的X射線能譜儀(EDS)、差示掃描量熱法(DSC)和振動(dòng)樣品磁強(qiáng)計(jì)(VSM)等表征手段對(duì)樣品物相組成、微觀組織結(jié)構(gòu)、不同溫度的相變和磁性能進(jìn)行了分析,研究了Nd2Fe14B相的形成過程。結(jié)果表明：采用化學(xué)法成功合成了分散良好的納米尺寸的NdFeB中間體,中間體由球狀Fe3O4顆粒和絮狀物的Nd、B元素有機(jī)物配位體組成；中間體經(jīng)過兩級(jí)退火轉(zhuǎn)變?yōu)镹dFeB磁粉。一級(jí)還原退火使NdFeB中間體轉(zhuǎn)化成NdFeO3、B2O3、Nd2O3和α-Fe；二級(jí)還原退火在CaH2輔助下的反應(yīng)過程：首先B2O3在501 ℃下被還原成B,接著678 ℃時(shí),Nd2O3和NdFeO3被還原以形成NdH2和α-Fe相,最后895 ℃時(shí),B、NdH2和α-Fe發(fā)生合金化反應(yīng)形成Nd2Fe14B磁粉。

    Abstract:

    The NdFeB magnetic powder with main phase Nd2Fe14B was successfully prepared by using the chemical method to prepare NdFeB intermediates and then through two-step reduction annealing. Phase, microstructure, phase transformation of different temperatures and magnetic properties of the samples were analyzed with XRD、TEM、DSC、VSM and so on. The formation mechanism of Nd2Fe14B phase was discussed. The results show that the nano-sized NdFeB intermediates with good dispersion, including spherical Fe3O4 particle and flocculent organic ligands consisting of Nd and B elements, can be synthesized by chemical method. In order to obtain NdFeB magnetic powder, the intermediate should be performed two-step reduction annealing. In the first-step reduction annealing process, NdFeB intermediates were converted into NdFeO3, B2O3, Nd2O3 and α-Fe phases. During the second-step annealing was carried out by CaH2, the reaction experiences following processes: firstly, B2O3 is reduced at 501 ℃.Then, Nd2O3 and NdFeO3 are reduced into NdH2 and α-Fe phases at 678 ℃. Finally, B、NdH2 and α-Fe are alloying reaction to formed Nd2Fe14B magnetic powder at 895 ℃.

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尤俊華,趙東,郭耀祖,吳純,裴文利.化學(xué)法制備Nd2Fe14B磁粉及其反應(yīng)過程[J].稀有金屬材料與工程,2018,47(5):1643~1647.[You Junhua, Zhao Dong, Guo Yaozu, wu chun, Pei Wenli. Preparation and Reaction Process of Nd2Fe14B Magnetic PowderSynthesized by Chemical Method[J]. Rare Metal Materials and Engineering,2018,47(5):1643~1647.]
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  • 收稿日期:2017-08-11
  • 最后修改日期:2017-10-30
  • 錄用日期:2017-11-08
  • 在線發(fā)布日期: 2018-06-08
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