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快淬NdFeB磁粉磁性能不均勻性問(wèn)題的研究
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國(guó)家高技術(shù)研究發(fā)展計(jì)劃(2002AA302602-2)；上海市重點(diǎn)稀土材料開(kāi)發(fā)及應(yīng)用計(jì)劃(03-111-54-05)


Ununiformity of Magnetic Properties for Melt-Spun NdFeB Powder
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    摘要:

    用磁選方法從同一批生產(chǎn)的含合金元素Zr和Co的快淬NdFeB磁粉中選出磁性能明顯不同的優(yōu)劣兩種粉磁，研究?jī)?yōu)劣兩種磁粉的成分及顯微組織結(jié)構(gòu)差別。結(jié)果表明：優(yōu)質(zhì)磁粉的Zr含量明顯偏低、Fe 含量略高，晶粒結(jié)晶完整、晶界襯度清晰，晶界上無(wú)其它相存在，晶粒尺寸大都分布在20～60 nm范圍內(nèi)，較為均勻；而劣質(zhì)磁粉的Zr含量偏高、Fe含量稍低，且劣質(zhì)粉中存在大量的亞穩(wěn)態(tài)組織結(jié)構(gòu)，包括非晶、α-Fe+非晶以及≤10 nm襯度不清晰、結(jié)構(gòu)不完整的Nd2Fe14B晶粒。認(rèn)為，劣質(zhì)磁粉中含Zr量偏高，提高了發(fā)生晶化的開(kāi)始溫度是造成磁性能不均勻的主要原因

    Abstract:

    Superior and inferior magnetic powders can be separated from the same batch crystallined NdFeB magnetic powders containing Zr and Co elements by magnetic separation method due to their magnetic ununiformity. The compositions and microstructures of the two powders with different magnetic properties were investigated. The results show that the superior powders contain less Zr and a relative more Fe, with integrated grains of about 20～60 nm in size and clear grain boundary without other phases. And the inferior powders contain more Zr and a relative lower Fe and metastable microstructures including the amorphous phases, the α-Fe and amorphous phases, and the un-integrated Nd2Fe14B phases of ≤10 nm in size. It is presumed that the ununiform magnetic properties are due to the elevated crystallization temperature induced by the more Zr content for the inferior powders

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黃照華,李 強(qiáng),張士巖,周邦新.快淬NdFeB磁粉磁性能不均勻性問(wèn)題的研究[J].稀有金屬材料與工程,2009,38(2):247~250.[Huang Zhaohua, Li Qiang, Zhang Shiyan, Zhou Bangxin. Ununiformity of Magnetic Properties for Melt-Spun NdFeB Powder[J]. Rare Metal Materials and Engineering,2009,38(2):247~250.]
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  • 收稿日期:2008-01-24
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