Microstructural Evaluation of Dy-Ni-Al Grain-Boundary-Diffusion (GBD) Treatment on Sintered Nd-Fe-B Magnet

Naoko Oono; Masato Sagawa; Ryuta Kasada; Hideki Matsui; Akihiko Kimura

doi:10.4028/www.scientific.net/MSF.654-656.2919

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HomeMaterials Science ForumMaterials Science Forum Vols. 654-656Microstructural Evaluation of Dy-Ni-Al...

Microstructural Evaluation of Dy-Ni-Al Grain-Boundary-Diffusion (GBD) Treatment on Sintered Nd-Fe-B Magnet

Abstract:

A novel GBD treatment with Dy-Ni-Al eutectic alloy powder enhanced the coercivity of the sintered Nd-Fe-B magnet plate as thick as 5mm to 1760 kA/m (22 kOe) without reducing the remanence. The results of wavelength dispersive X-ray spectroscopy (WDS) indicated that this industrially epoch-making treatment spread Dy, which is a coercivity enhancing element, from the surface to the centre of the magnet through Nd-rich phase. Microstructural observations suggested that Ni and Al, which are the melting point depressants of Nd and Dy, enabled the high diffusivity of Dy.

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Materials Science Forum (Volumes 654-656)

Pages:

2919-2922

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.654-656.2919

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Online since:

June 2010

Authors:

Naoko Oono, Masato Sagawa, Ryuta Kasada, Hideki Matsui, Akihiko Kimura

Keywords:

Coercivity Improvement, Dysprosium, Grain Boundary Diffusion Treatment, Nd-Fe-B Sintered Magnet

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References

[1] Y. Matsuura, J. Magn. Magn. Mat. Vol. 303 (2006) p.344.

Google Scholar

[2] H. Satoh, A. Akutsu, T. Miyamura and H. Shinoki, SAE technical paper series, 2004-01-0567 (2004).

DOI: 10.4271/2004-01-0567

Google Scholar

[3] For example, S. Hirosawa, Y. Matsuura, H. Yamamoto, S. Fujimura and M. Sagawa, J. Appl. Phys. Vol. 59 (1986) p.873.

Google Scholar

[4] K. T. Park, K. Hiraga and M. Sagawa, Proceedings of the 6th Internatinal Workshop on Rare-Earth Magnets and Their Applications, edited by H. Kaneko, M. Honma, M. Okada, The Japan Institute of Metals, (2000) pp.257-264.

Google Scholar

[5] K. Hirota, H. Nakamura, T. Minowa and M. Honshima, IEEE Trans. Magn. Vol. 42 (2006) p.2909.

Google Scholar

[6] D. Li, S. Suzuki, T. Kawasaki and K. Machida, Japan. J. Appl. Phys. Vol. 47 (2008) p.7876.

Google Scholar

[7] N. Watanabe, H. Umemoto, M. Ishimaru, M. Itakura, M. Nishida and K. Machida, J. Microscopy Vol. 236 (2009) p.104.

Google Scholar

[8] In: Alloy phase diagrams, volme 3 of ASM handbook, p.145, 182, 1542, 2791, Materials Park, OH: ASM International (1992).

Google Scholar