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Co和Zr元素對納米晶復合NdFeB永磁合金晶化行為和磁性能的影響
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上海高校培養(yǎng)優(yōu)秀青年教師科研專項基金 (06XPYQl9)；上海市教委重點學科 (J51402)


Effects of Co and Zr on Crystallization Behavior and Magnetic Properties of Nanocomposite NdFeB Alloys
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    利用熔體快淬法和晶化退火處理工藝制備納米晶復合NdFeB永磁合金，研究添加Co和Zr元素對合金晶化行為、微結構和磁性能的影響。結果表明，添加Co元素降低了晶化相的析出溫度，提高了合金的剩磁；進一步增加Zr元素后，合金的晶化行為由兩步晶化變?yōu)檐浻泊畔嗤轿龀觯辖鸬某C頑力明顯提高，晶粒得到細化，軟、硬磁相之間的交換耦合作用顯著增強，從而使合金Nd9.5Fe76Co5Zr3B6.5表現(xiàn)出優(yōu)異的綜合磁性能，即Jr＝0.93 T，iHc=687 kA/m，(BH)max＝129 kJ/m3。

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    Nanocomposite NdFeB magnets were prepared by melt-spun and crystallization annealing. Effects of Co and Zr addition on the crystallization behavior, microstructure and magnetic properties of the magnets were investigated. Results show that Co addition decreases the precipitation temperature of crystalline phases and increases the remanence. After further addition of Zr, the crystallization behavior changes from a two-step to a single-step process, the coercivity is increased markedly and the grains are refined. The exchange coupling interaction between the soft magnetic phase and the hard phase is enhanced obviously; as a result, the Nd9.5Fe76Co5Zr3B6.5 alloy exhibits excellent overall properties, i.e. Jr＝0.93 T, iHc=687 kA/m and (BH)max＝129 kJ/m3.

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李 芳,李曼萍,王慧萍. Co和Zr元素對納米晶復合NdFeB永磁合金晶化行為和磁性能的影響[J].稀有金屬材料與工程,2012,41(9):1611~1614.[Li Fang, Li Manping, Wang Huiping. Effects of Co and Zr on Crystallization Behavior and Magnetic Properties of Nanocomposite NdFeB Alloys[J]. Rare Metal Materials and Engineering,2012,41(9):1611~1614.]
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  • 收稿日期:2011-09-11
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