Influence of gadolinium on microstructure and magnetic properties of sintered NdGdFeB magnets

The effect of Gd content on microstructure and magnetic properties of sintered Nd33.03-xGdxFe65.65B1.32 （x=0-2） was studied in this paper to improve the thermal stability of NdFeB and to reduce the raw material cost. The results showed that better magnet performance could be obtained by adding Gd （0...

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Bibliographic Details
Published in:Journal of rare earths 2012-02, Vol.30 (2), p.133-136
Main Author: 闫文龙 颜世宏 于敦波 李扩社 李红卫 罗阳 杨红川
Format: Article
Language:English
Subjects:
Br (Br(α))
Curie temperature
Gd content
Magnetic properties
magnetic property
Magnets
Microstructure
Neodymium
Rare earth metals
rare earths
Raw materials
sintered NdGdFeB
Sintering
居里温度
微观结构
正温度系数
永磁性能
烧结
磁学性质
磁铁
钆
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Summary:The effect of Gd content on microstructure and magnetic properties of sintered Nd33.03-xGdxFe65.65B1.32 （x=0-2） was studied in this paper to improve the thermal stability of NdFeB and to reduce the raw material cost. The results showed that better magnet performance could be obtained by adding Gd （0-1.5 wt.%） with partial substitution of Nd in Nd33.03-xGdxFe65.65B1.32. It was also found that the Nd33.03-xGdxFe65.65B1.32 magnets showed the best performance when Gd addition increased to 1.0 wt.%. The temperature coefficient Br （α） could be improved from -0.15%/oC to -0.063%/oC （maximum work temperature 120 oC） and the Curie temperature could be improved from 315 oC to 323 oC because the Gd2Fe14B had positive temperature coefficient Br （α） and higher Curie temperature than that of Nd2Fe14B. The coercivity could be improved from 10.2 to 11.48 kOe and the microstructure was close to ideal microstructure. The magnetic performance decreased sharply by adding Gd （above 2 wt.%） with partial substitution of Nd in Nd33.03-xGdxFe65.65B1.32 because the Gd element concen-trated in the grain boundaries.
ISSN:1002-0721
2509-4963
DOI:10.1016/S1002-0721(12)60009-X