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快淬Fe3B／Nd2Fe14B永磁材料晶化行為及磁性能的研究
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TM273

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國家“863”納米專項(xiàng)（2002AA302602）及北京市自然科學(xué)基金（2032011）資助


Study on the Crystallization Behavior and Magnetic Properties of Melt-Spun Fe3B/Nd2Fe14B Composite Magnets
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    摘要:

    利用熔體快淬和晶化處理的方法制備了快淬Fe3B／Nd2Fe14B永磁材料。采用XRD，DTA，VSM等方法對(duì)合金的晶化行為和磁性能進(jìn)行研究。結(jié)果表明：對(duì)于Fe3B／Nd2Fe14B熔體快淬永磁粉末，升溫速率對(duì)各相的析出和分解溫度有一定的影響。完全過淬的Nd4.5Fe77B18.5和Nd4Fe77Cr0.5B18.5合金熔體快淬粉在進(jìn)行973K，7min晶化處理過程中，首先形成Nd2Fe23B3相，然后Nd2Fe23B3相發(fā)生分解，其產(chǎn)物為Fe3B／Nd2Fe14B，此后再?zèng)]有發(fā)生其它的相轉(zhuǎn)變。當(dāng)晶化溫度大于953K，保溫10min后，樣品的剩磁、矯頑力和最大磁能積明顯提高。微量元素Cr的添加對(duì)相轉(zhuǎn)變溫度有影響，同時(shí)可以細(xì)化晶粒，提高矯頑力，從而改善材料的永磁性能。

    Abstract:

    Fe3B/Nd2Fe14B nanocomposite magnetic powders were prepared by melt quenching and heat-treatment.The microstructure and crystallization behavior were studied by X-ray diffraction(XRD),differential thermal analysis(DTA),and vibrating sample magnetometer(VSM).It is found that the heating-up rate will affect the formation and decomposition of the phases at a certain extent for melt-spun Fe3B/Nd2Fe14B powders.It is confirmed that the overquenched Nd4.5Fe77B18.5 and Nd4Fe77Cr0.5B18.5 samples were decomposed to Fe3B/Nd2Fe14B via metastable Nd2Fe23B3 during annealing at 973 K for 7 min.Hci,Jr and(BH)max have been obviously improved for the samples annealed above 953 K for 10 min.The addition of Cr is effective for refining the grain size and increasing the intrinsic coercivity,resulting in an improvement of hard magnetic properties.

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龐利佳 陳菊芳 孫光飛 強(qiáng)文江 彭維波 張錦標(biāo) 黎文安.快淬Fe3B／Nd2Fe14B永磁材料晶化行為及磁性能的研究[J].稀有金屬材料與工程,2006,35(9):1487~1491.[Pang Lijia, Chen Jufang, Sun Guangfei, Qiang Wenjiang, Peng Weibo, Zhang Jinbiao, Li Wenan. Study on the Crystallization Behavior and Magnetic Properties of Melt-Spun Fe3B/Nd2Fe14B Composite Magnets[J]. Rare Metal Materials and Engineering,2006,35(9):1487~1491.]
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  • 收稿日期:2005-08-05
  • 最后修改日期:2005-08-05
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