Preparation of Anisotropic Nd-Lean Nd-Fe-B Magnets with Improved Coercivity

Qian Shen; Yi Long Ma; Xue Guo Yin; Tao Zhou

doi:10.4028/www.scientific.net/MSF.898.1675

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HomeMaterials Science ForumMaterials Science Forum Vol. 898Preparation of Anisotropic Nd-Lean Nd-Fe-B Magnets...

Preparation of Anisotropic Nd-Lean Nd-Fe-B Magnets with Improved Coercivity

Abstract:

Anisotropic bulk nanocrystal Nd-lean Nd-Fe-B magnets were prepared by hot-pressing the mixture of Nd_11.5Fe_81.5Nb₁B₆melt-spun ribbons and pure Zn powder and subsequent hot-deforming. The effects of deformation on the magnetic properties and microstructure were also studied. The magnetic properties increased significantly for hot-deformed (HD) samples due to the formation of good c-axis texture with increasing deformation. The remanence M_r and maximal energy product (BH)_m increased and reached their maximal values at 65% deformation due to the increasing orientation. On the other hand, the grains increased and were elongated normal to the press direction gradually with increasing deformation. The variation trend was similar to that of traditional Nd-Fe-B magnets. However, there was an obvious improvement for coercivity in the initial stage of hot-deformation resulting from the adequate Zn diffusion into grain-boundary. When the deformation was larger than 65%, the magnetic properties were deteriorated due to abnormal grain growth. In order to improve further the coercivity Hci, the samples with Dy addition were prepared. The coercivity of 12300 Oe could be obtained for anisotropic bulk Nd_9.5Dy₂Fe_81.5Nb₁B₆.

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Periodical:

Materials Science Forum (Volume 898)

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1675-1680

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https://doi.org/10.4028/www.scientific.net/MSF.898.1675

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Online since:

June 2017

Authors:

Qian Shen*, Yi Long Ma, Xue Guo Yin, Tao Zhou

Keywords:

Coercivity, Hot-Deformation, Magnetic Properties, Nd-Fe-B

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References

[1] R. K. Mishra, Microstructure of hot-pressed and die-upset NdFeB magnets, J. Appl. Phys., 62 (1987) 967-971.

DOI: 10.1063/1.339709

Google Scholar

[2] R. W. Lee, Hot-pressed neodymium-iron-boron magnets, Appl. Phys. Lett., 46 (1985) 790-791.

DOI: 10.1063/1.95884

Google Scholar

[3] M. Yue, M. Tian, J. X. Zhang, et al., Microstructure and magnetic properties of anisotropic Nd-Fe-B magnets produced by spark plasma sintering technique, Mater. Sci. and Eng. B., 131 (2006) 18-21.

DOI: 10.1016/j.mseb.2005.11.010

Google Scholar

[4] L. Li, J. C. D Graham, The origin of crystallographic texture produced during hot deformation in rapidly-quenched NdFeB permanent magnets, IEEE Trans. Magn., 28 (1992) 2130-2132.

DOI: 10.1109/20.179419

Google Scholar

[5] A. M. Gabay, Y. Zhang, G. C Hadjipanayis, Die-upset hybrid PrFeB nanocomposite magnets, Appl. Phys. Lett., 85 (2004) 446-448.

DOI: 10.1063/1.1773931

Google Scholar

[6] M. Yue, P. L. Niu, et al., Structure and magnetic properties of bulk isotropic and anisotropic Nd-Fe-B/α-Fe nanocomposite permanent magnets with different α-Fe contents, J. Appl. Phys., 103 (2008) 07E101-1-3.

DOI: 10.1063/1.2828593

Google Scholar

[7] Y. G. Liu, L. Xu, Q. Wang, W. Li, Development of crystal texture in Nd-lean amorphous Nd9Fe85B6 under hot deformation, Appl. Phys. Lett., 94 (2009) 172502-1-4.

DOI: 10.1063/1.3126444

Google Scholar

[8] X. Tang, R. J. Chen, W. Yin, et al., Enhanced texture in die-upset nanocomposite magnets by Nd-Cu grain boundary diffusion, Appl. Phys. Lett., 102 (2013) 072409-1-5.

DOI: 10.1063/1.4793429

Google Scholar

[9] Y. L. Huang, Z. W. Liu, X. C. Zhong, et al., Diffusion of Nd-rich phase in the spark plasma sintered and hot deformed nanocrystalline NdFeB magnets, J. Appl. Phys., 111 (2012) 033913-1-3.

DOI: 10.1063/1.3682471

Google Scholar

[10] Y. L. Ma, Y. Liu, J. Li, et al., Anisotropic nanocomposite Nd2Fe14B/α-Fe magnets prepared by spark plasma sintering, IEEE Trans. Magn., 45 (2009) 2605-2607.

DOI: 10.1109/tmag.2009.2018911

Google Scholar

[11] Y. L. Ma, Y. Liu, J. Li, et al., Die-upset Nd11. 5Fe72. 4Co9Nb1B6. 1 magnets with additions of Zn, Al and Sn, J. Magn. Magn. Mater., 322 (2010) 2419-2422.

DOI: 10.1016/j.jmmm.2010.02.049

Google Scholar

[12] J. Li, Y. Liu, Y. L. Ma, Effect of niobium on microstructure and magnetic properties of bulk anisotropic NdFeB/α-Fe nanocomposites, J. Magn. Magn. Mater., 324 (2012) 2292-2297.

DOI: 10.1016/j.jmmm.2012.02.118

Google Scholar

[13] Y. L. Ma, Y. Liu, J. Li, et al., Magnetic properties and microstructure studies of hot-deformed Nd-Fe-B magnets with Zr addition, IEEE Trans. Magn., 46 (2010) 2566 -2569.

DOI: 10.1109/tmag.2010.2041554

Google Scholar