Anisotropie Nd2Fe14B-based magnet powder with high remanence produced by modified HDDR process

K. Morimoto; R. Nakayama; K. Mori; K. Igarashi; Y. Ishii; M. Itakura; N. Kuwano; K. Oki

doi:10.1109/20.800489

Anisotropie Nd₂Fe₁₄B-based magnet powder with high remanence produced by modified HDDR process

K. Morimoto, R. Nakayama, K. Mori, K. Igarashi, Y. Ishii, M. Itakura, N. Kuwano, K. Oki

Research output: Contribution to journal › Article › peer-review

27 Citations (Scopus)

Abstract

The hydrogenatlqn-decompösition-desorptlonrecombination (HDDR) process is a unlqe method to produce anisotropic Ni)2FeuB-hased magnet powder for bonded magnet application. In this study, we studied the effect of appending the intermediate Ar (IA) treatment, Le., hydrogenated materials are annealed under an Ar atmosphere before the evacuation treatment in the HDDR process, on the magnetic properties of magnet powder. It was found that the IA treatment is very effective to enhance magnetic anisotropy of the powder. The optimum magnetic properties of the anisotropic bonded magnet made from the IA treatment processed Nd_12.6 Fe_balCo_17.4B_6.5Zr₀Oa_0.3 powder are as follows B_r=1.06 T, H_cj=992 ItA/m, and (BH)_max=193 kJ/m³.It was observed that the IA treatment induces rapid growth of a -(Fe,Co) grains in the decomposed mixture of the alloy. This microstructural change of the alloy is considered to be strongly related to the preferred crystallographic orientation of the final magnet powder.

Original language	English
Pages (from-to)	3253-3255
Number of pages	3
Journal	IEEE Transactions on Magnetics
Volume	35
Issue number	5 PART 2
DOIs	https://doi.org/10.1109/20.800489
Publication status	Published - 1999
Externally published	Yes

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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10.1109/20.800489

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title = "Anisotropie Nd2Fe14B-based magnet powder with high remanence produced by modified HDDR process",

abstract = "The hydrogenatlqn-decomp{\"o}sition-desorptlonrecombination (HDDR) process is a unlqe method to produce anisotropic Ni)2FeuB-hased magnet powder for bonded magnet application. In this study, we studied the effect of appending the intermediate Ar (IA) treatment, Le., hydrogenated materials are annealed under an Ar atmosphere before the evacuation treatment in the HDDR process, on the magnetic properties of magnet powder. It was found that the IA treatment is very effective to enhance magnetic anisotropy of the powder. The optimum magnetic properties of the anisotropic bonded magnet made from the IA treatment processed Nd12.6 FebalCo17.4B6.5Zr0Oa0.3 powder are as follows Br=1.06 T, Hcj=992 ItA/m, and (BH)max=193 kJ/m3.It was observed that the IA treatment induces rapid growth of a -(Fe,Co) grains in the decomposed mixture of the alloy. This microstructural change of the alloy is considered to be strongly related to the preferred crystallographic orientation of the final magnet powder.",

author = "K. Morimoto and R. Nakayama and K. Mori and K. Igarashi and Y. Ishii and M. Itakura and N. Kuwano and K. Oki",

year = "1999",

doi = "10.1109/20.800489",

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volume = "35",

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T1 - Anisotropie Nd2Fe14B-based magnet powder with high remanence produced by modified HDDR process

AU - Morimoto, K.

AU - Nakayama, R.

AU - Mori, K.

AU - Igarashi, K.

AU - Ishii, Y.

AU - Itakura, M.

AU - Kuwano, N.

AU - Oki, K.

PY - 1999

Y1 - 1999

N2 - The hydrogenatlqn-decompösition-desorptlonrecombination (HDDR) process is a unlqe method to produce anisotropic Ni)2FeuB-hased magnet powder for bonded magnet application. In this study, we studied the effect of appending the intermediate Ar (IA) treatment, Le., hydrogenated materials are annealed under an Ar atmosphere before the evacuation treatment in the HDDR process, on the magnetic properties of magnet powder. It was found that the IA treatment is very effective to enhance magnetic anisotropy of the powder. The optimum magnetic properties of the anisotropic bonded magnet made from the IA treatment processed Nd12.6 FebalCo17.4B6.5Zr0Oa0.3 powder are as follows Br=1.06 T, Hcj=992 ItA/m, and (BH)max=193 kJ/m3.It was observed that the IA treatment induces rapid growth of a -(Fe,Co) grains in the decomposed mixture of the alloy. This microstructural change of the alloy is considered to be strongly related to the preferred crystallographic orientation of the final magnet powder.

AB - The hydrogenatlqn-decompösition-desorptlonrecombination (HDDR) process is a unlqe method to produce anisotropic Ni)2FeuB-hased magnet powder for bonded magnet application. In this study, we studied the effect of appending the intermediate Ar (IA) treatment, Le., hydrogenated materials are annealed under an Ar atmosphere before the evacuation treatment in the HDDR process, on the magnetic properties of magnet powder. It was found that the IA treatment is very effective to enhance magnetic anisotropy of the powder. The optimum magnetic properties of the anisotropic bonded magnet made from the IA treatment processed Nd12.6 FebalCo17.4B6.5Zr0Oa0.3 powder are as follows Br=1.06 T, Hcj=992 ItA/m, and (BH)max=193 kJ/m3.It was observed that the IA treatment induces rapid growth of a -(Fe,Co) grains in the decomposed mixture of the alloy. This microstructural change of the alloy is considered to be strongly related to the preferred crystallographic orientation of the final magnet powder.

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JO - IEEE Transactions on Magnetics

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Anisotropie Nd₂Fe₁₄B-based magnet powder with high remanence produced by modified HDDR process

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