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Effects of Dy on Magnetic Properties and Microstructure of Nanocomposite (Nd,Pr)10.5-xDyxFe83.5B6 Alloys
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Effects of Dy on Magnetic Properties and Microstructure of Nanocomposite (Nd,Pr)10.5-xDyxFe83.5B6 Alloys
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Spring Sunshine Plan of the Ministry of Education of China (Z2010095); Key Laboratory of Special Materials and Preparation in Sichuan Province (SZJJ2011-013)

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    摘要:

    采用快淬法制備了鐠基(Nd,Pr)10.5-xDyxFe83.5B6 (x=0.0, 0.5, 1.0, 1.5, 2.0, 2.5)系列粘結(jié)磁體，研究了Dy元素添加對快淬合金顯微組織結(jié)構(gòu)、磁性能及快淬薄帶熱穩(wěn)定性的影響。與Nd2Fe14B相比，硬磁相Dy2Fe14B具有較高的磁晶各向異性場HA和較低的飽和磁極化強(qiáng)度Js，因此，Dy元素添加能顯著提高合金的內(nèi)稟矯頑力Hcj，但會降低合金的剩磁Br。Dy 元素替代Nd/Pr元素，增強(qiáng)了快淬薄帶的熱穩(wěn)定性，提高了晶化退火溫度。較高的晶化退火溫度，使快淬薄帶中已經(jīng)形成的微晶更容易長大，形成一些粗大晶粒，降低了粘結(jié)磁體的磁性能。1.0% 是較佳的Dy元素添加量，(Nd,Pr)9.5Dy1Fe83.5B6合金快淬粘結(jié)磁體的最大磁能積(BH)max為71.6 kJ/m3，剩磁Br為0.638 T，內(nèi)稟矯頑力Hcj為611 kA/m

    Abstract:

    A series of bonded magnets of (Nd,Pr)10.5-xDyxFe83.5B6 (x=0.0, 0.5, 1.0, 1.5, 2.0, 2.5) alloys were prepared by a melt-spun method. The effects of Dy substitution on the thermal stability of as-spun ribbons, the magnetic properties and microstructures of alloys were investigated. Dy addition will enhance the intrinsic coercivity Hcj greatly, but reduce the remanence Br, because Dy2Fe14B has a higher magnetocrystalline anisotropy field HA and a lower saturation magnetic polarization Js compared to those of Nd2Fe14B. The Dy substitution for Nd/Pr enhances the thermal stability and increases the crystallization annealing temperature. The higher annealing temperature leads the fine crystallites existing in as-spun ribbons to easily growing, resulting in appearance of some bigger grains and deterioration of the bonded magnet property. The bonded magnet of (Nd,Pr)9.5Dy1Fe83.5B6 alloy with 1.0at% Dy has optimal magnetic properties, i.e (BH)max=71.6 kJ/m3, Br=0.638 T, and Hcj= 611 kA/m

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查五生,周淑容,鄭 浩,吳開霞,袁 強(qiáng),趙新為. Effects of Dy on Magnetic Properties and Microstructure of Nanocomposite (Nd, Pr)10.5-xDyxFe83.5B6 Alloys[J].稀有金屬材料與工程,2015,44(4):813~816.[Zha Wusheng, Zhou Shurong, Zheng Hao, Wu Kaixia, Yuan Qiang, Zhao Xinwei. Effects of Dy on Magnetic Properties and Microstructure of Nanocomposite (Nd, Pr)10.5-xDyxFe83.5B6 Alloys[J]. Rare Metal Materials and Engineering,2015,44(4):813~816.]
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  • 收稿日期:2014-04-19
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  • 在線發(fā)布日期: 2015-06-08
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