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納米晶復(fù)合Nd9.5Fe79-xCo5NbxB6.5(x=0, 1, 2, 3)永磁合金的微結(jié)構(gòu)和磁性能
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上海日港置信非晶體金屬有限公司,上海大學(xué) 材料研究所

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Microstrucuture and magnetic properties of nanocomposite Nd9.5Fe79-xCo5NbxB6.5 (x=0, 1, 2, 3) permanent alloys
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Shanghai Rigang Zhixin Amorphous Metals Co., Ltd.,shanghai university

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    摘要:

    利用X射線衍射（XRD）、振動(dòng)樣品磁強(qiáng)計(jì)（VSM）、透射電子顯微鏡（TEM）和三維原子探針（3DAP）等研究了Nb元素對(duì)納米晶復(fù)合Nd9.5Fe79-xCo5NbxB6.5(x=0, 1, 2, 3)永磁合金微結(jié)構(gòu)和磁性能的影響。結(jié)果表明，隨著Nb元素的增加，合金的剩磁Jr首先增加，在Nb含量為1at%時(shí)達(dá)到最大值0.94T，繼續(xù)增加Nb元素后，合金的剩磁開(kāi)始下降；矯頑力iHc則隨著Nb元素的增加逐步增加，當(dāng)Nb含量超過(guò)2at%后，增加幅度變緩；合金的最大磁能積(BH)max隨著Nb元素的增加先增加后降低，納米晶復(fù)合Nd9.5Fe77Co5Nb2B6.5合金具有最優(yōu)的綜合磁性能，即Jr＝0.91T，iHc=663kA/m，(BH)max=120kJ/m3。Nb元素在合金的晶化過(guò)程中富集于晶間形成NbFeB相，有利于細(xì)化晶粒尺寸，從而提高合金的磁性能。

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    Nanocomposite permanent magnets have been extensively researched because of their unusually high remanence, high energy products and low cost, but little research has elucidated the underlying mechanism for microstructure improvement. Nanocomposite Nd9.5Fe79-xCo5NbxB6.5(x=0, 1, 2, 3) alloys were prepared by melt-spinning at a rate of 18m/s cooperating with subsequent annealing. The effects of Nb content on microstructure and magnetic properties for the alloys have been studied by XRD, VSM, TEM and 3DAP. The results shown that the Jr firstly increases with increasing Nb content from 0.92T up to 0.94T at x=1, then decreases obviously with further Nb addition. The iHc increases monotonically and then remains relatively lower increasing ratio. The (BH)max appears to increase from 104kJ/m3 at x=0 to a maximum of 120kJ/m3 at x=2, then decreases sharply. An intergranular NbFeB phase with a chemical composition near the Nb: Fe: B stoichiometry of 26: 48: 26 between the Nd2Fe14B interfaces was found for Nd9.5Fe77Co5Nb2B6.5 by 3DAP technique, which provides direct evidence of magnetic properties improvement.

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張士巖,徐暉.納米晶復(fù)合Nd9.5Fe79-xCo5NbxB6.5(x=0, 1, 2, 3)永磁合金的微結(jié)構(gòu)和磁性能[J].稀有金屬材料與工程,2017,46(1):122~126.[zhangshiyan, xuhui. Microstrucuture and magnetic properties of nanocomposite Nd9.5Fe79-xCo5NbxB6.5 (x=0, 1, 2, 3) permanent alloys[J]. Rare Metal Materials and Engineering,2017,46(1):122~126.]
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  • 收稿日期:2014-10-16
  • 最后修改日期:2015-03-31
  • 錄用日期:2015-05-13
  • 在線發(fā)布日期: 2017-03-16
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