Development of Dy-Free Nd-Fe-B anisotropic bonded magnet and application to the small motors

Chisato Mishima; Kenji Noguchi; Masao Yamazaki; Hiroshi Matsuoka; Hironari Mitarai; Yoshinobu Honkura

doi:10.2320/jinstmet.76.89

Development of Dy-Free Nd-Fe-B anisotropic bonded magnet and application to the small motors

Chisato Mishima, Kenji Noguchi, Masao Yamazaki, Hiroshi Matsuoka, Hironari Mitarai, Yoshinobu Honkura

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

14 Citations (Scopus)

Abstract

The authors have successfully developed a low-cost anisotropic Nd-Fe-B magnet powder with a high coercivity value of 1591 kAm ^-1 without any dysprosium additives by diffusion processing of Nd-Cu-Al element into anisotropic magnet powder produced by the d-HDDR (dynamic-hydrogenation, disproportionation, desorption and recombination) method. This enhancement mechanism is to isolate the magnetic coupling between the grains of Nd ₂Fe ₁₄B phase by a Nd rich grain boundary phase with Cu. By surface coating this anisotropic magnet powder, the long-term aging loss behavior under air at 150°C is less than 5% after 1000 h. By using this new anisotropic bonded magnet (New-MAGFINE), small automotive motors with excellent thermal stability and low cost characteristics have become possible.

Original language	English
Pages (from-to)	89-95
Number of pages	7
Journal	Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume	76
Issue number	1
DOIs	https://doi.org/10.2320/jinstmet.76.89
Publication status	Published - 2012 Jan
Externally published	Yes

Keywords

Anisotropic bonded magnet
D-HDDR(dynamic-hydrogenation
Desorption and recombination)
Diffusion process
Disproportionation
Dysprosium-free
Neodymium-iron-boron
Small motor

ASJC Scopus subject areas

Condensed Matter Physics
Mechanics of Materials
Metals and Alloys
Materials Chemistry

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Cite this

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title = "Development of Dy-Free Nd-Fe-B anisotropic bonded magnet and application to the small motors",

abstract = "The authors have successfully developed a low-cost anisotropic Nd-Fe-B magnet powder with a high coercivity value of 1591 kAm -1 without any dysprosium additives by diffusion processing of Nd-Cu-Al element into anisotropic magnet powder produced by the d-HDDR (dynamic-hydrogenation, disproportionation, desorption and recombination) method. This enhancement mechanism is to isolate the magnetic coupling between the grains of Nd 2Fe 14B phase by a Nd rich grain boundary phase with Cu. By surface coating this anisotropic magnet powder, the long-term aging loss behavior under air at 150°C is less than 5% after 1000 h. By using this new anisotropic bonded magnet (New-MAGFINE), small automotive motors with excellent thermal stability and low cost characteristics have become possible.",

keywords = "Anisotropic bonded magnet, D-HDDR(dynamic-hydrogenation, Desorption and recombination), Diffusion process, Disproportionation, Dysprosium-free, Neodymium-iron-boron, Small motor",

author = "Chisato Mishima and Kenji Noguchi and Masao Yamazaki and Hiroshi Matsuoka and Hironari Mitarai and Yoshinobu Honkura",

year = "2012",

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doi = "10.2320/jinstmet.76.89",

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AU - Mishima, Chisato

AU - Noguchi, Kenji

AU - Yamazaki, Masao

AU - Matsuoka, Hiroshi

AU - Mitarai, Hironari

AU - Honkura, Yoshinobu

PY - 2012/1

Y1 - 2012/1

N2 - The authors have successfully developed a low-cost anisotropic Nd-Fe-B magnet powder with a high coercivity value of 1591 kAm -1 without any dysprosium additives by diffusion processing of Nd-Cu-Al element into anisotropic magnet powder produced by the d-HDDR (dynamic-hydrogenation, disproportionation, desorption and recombination) method. This enhancement mechanism is to isolate the magnetic coupling between the grains of Nd 2Fe 14B phase by a Nd rich grain boundary phase with Cu. By surface coating this anisotropic magnet powder, the long-term aging loss behavior under air at 150°C is less than 5% after 1000 h. By using this new anisotropic bonded magnet (New-MAGFINE), small automotive motors with excellent thermal stability and low cost characteristics have become possible.

AB - The authors have successfully developed a low-cost anisotropic Nd-Fe-B magnet powder with a high coercivity value of 1591 kAm -1 without any dysprosium additives by diffusion processing of Nd-Cu-Al element into anisotropic magnet powder produced by the d-HDDR (dynamic-hydrogenation, disproportionation, desorption and recombination) method. This enhancement mechanism is to isolate the magnetic coupling between the grains of Nd 2Fe 14B phase by a Nd rich grain boundary phase with Cu. By surface coating this anisotropic magnet powder, the long-term aging loss behavior under air at 150°C is less than 5% after 1000 h. By using this new anisotropic bonded magnet (New-MAGFINE), small automotive motors with excellent thermal stability and low cost characteristics have become possible.

KW - Anisotropic bonded magnet

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KW - Desorption and recombination)

KW - Diffusion process

KW - Disproportionation

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KW - Neodymium-iron-boron

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Development of Dy-Free Nd-Fe-B anisotropic bonded magnet and application to the small motors

Abstract

Keywords

ASJC Scopus subject areas

Access to Document

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