Preparation of ultrafine jet-milled powders for Nd-Fe-B sintered magnets using hydrogenation-disproportionation-desorption-recombination and hydrogen decrepitation processes

Michihide Nakamura; Masashi Matsuura; Nobuki Tezuka; Satoshi Sugimoto; Yasuhiro Une; Hirokazu Kubo; Masato Sagawa

doi:10.1063/1.4813399

Preparation of ultrafine jet-milled powders for Nd-Fe-B sintered magnets using hydrogenation-disproportionation-desorption-recombination and hydrogen decrepitation processes

Michihide Nakamura, Masashi Matsuura, Nobuki Tezuka, Satoshi Sugimoto, Yasuhiro Une, Hirokazu Kubo, Masato Sagawa

ENG - Materials Science

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

44 Citations (Scopus)

Abstract

Dy addition is used to increase the coercivity of Nd-Fe-B sintered magnets. Given that Dy is rare and expensive, a method is needed for reducing the Dy content in such magnets without decreasing their coercivity. Refining Nd ₂Fe₁₄B grains is a prospective method for increasing the coercivity of Nd-Fe-B magnets. Conventional jet milling, however, cannot crush strip-casted Nd-Fe-B alloys into powders less than 1 μm in size. We report a process for preparing ultrafine jet-milled powders with an average size of 0.33 μm for Nd-Fe-B sintered magnets: a combination of hydrogenation- disproportionation-desorption-recombination, hydrogen decrepitation, and He jet milling.

Original language	English
Article number	022404
Journal	Applied Physics Letters
Volume	103
Issue number	2
DOIs	https://doi.org/10.1063/1.4813399
Publication status	Published - 2013 Jul 8

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title = "Preparation of ultrafine jet-milled powders for Nd-Fe-B sintered magnets using hydrogenation-disproportionation-desorption-recombination and hydrogen decrepitation processes",

abstract = "Dy addition is used to increase the coercivity of Nd-Fe-B sintered magnets. Given that Dy is rare and expensive, a method is needed for reducing the Dy content in such magnets without decreasing their coercivity. Refining Nd 2Fe14B grains is a prospective method for increasing the coercivity of Nd-Fe-B magnets. Conventional jet milling, however, cannot crush strip-casted Nd-Fe-B alloys into powders less than 1 μm in size. We report a process for preparing ultrafine jet-milled powders with an average size of 0.33 μm for Nd-Fe-B sintered magnets: a combination of hydrogenation- disproportionation-desorption-recombination, hydrogen decrepitation, and He jet milling.",

author = "Michihide Nakamura and Masashi Matsuura and Nobuki Tezuka and Satoshi Sugimoto and Yasuhiro Une and Hirokazu Kubo and Masato Sagawa",

note = "Funding Information: This study was supported by the “Future Pioneering Projects/Development of magnetic material technology for high-efficiency motors” from the Ministry of Economy, Trade and Industry, and by a JSPS KAKENHI, Grant-in-Aid for JSPS Fellows, 255050.",

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doi = "10.1063/1.4813399",

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Preparation of ultrafine jet-milled powders for Nd-Fe-B sintered magnets using hydrogenation-disproportionation-desorption-recombination and hydrogen decrepitation processes. / Nakamura, Michihide; Matsuura, Masashi ; Tezuka, Nobuki et al.
In: Applied Physics Letters, Vol. 103, No. 2, 022404, 08.07.2013.

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

TY - JOUR

T1 - Preparation of ultrafine jet-milled powders for Nd-Fe-B sintered magnets using hydrogenation-disproportionation-desorption-recombination and hydrogen decrepitation processes

AU - Nakamura, Michihide

AU - Matsuura, Masashi

AU - Tezuka, Nobuki

AU - Sugimoto, Satoshi

AU - Une, Yasuhiro

AU - Kubo, Hirokazu

AU - Sagawa, Masato

N1 - Funding Information: This study was supported by the “Future Pioneering Projects/Development of magnetic material technology for high-efficiency motors” from the Ministry of Economy, Trade and Industry, and by a JSPS KAKENHI, Grant-in-Aid for JSPS Fellows, 255050.

PY - 2013/7/8

Y1 - 2013/7/8

N2 - Dy addition is used to increase the coercivity of Nd-Fe-B sintered magnets. Given that Dy is rare and expensive, a method is needed for reducing the Dy content in such magnets without decreasing their coercivity. Refining Nd 2Fe14B grains is a prospective method for increasing the coercivity of Nd-Fe-B magnets. Conventional jet milling, however, cannot crush strip-casted Nd-Fe-B alloys into powders less than 1 μm in size. We report a process for preparing ultrafine jet-milled powders with an average size of 0.33 μm for Nd-Fe-B sintered magnets: a combination of hydrogenation- disproportionation-desorption-recombination, hydrogen decrepitation, and He jet milling.

AB - Dy addition is used to increase the coercivity of Nd-Fe-B sintered magnets. Given that Dy is rare and expensive, a method is needed for reducing the Dy content in such magnets without decreasing their coercivity. Refining Nd 2Fe14B grains is a prospective method for increasing the coercivity of Nd-Fe-B magnets. Conventional jet milling, however, cannot crush strip-casted Nd-Fe-B alloys into powders less than 1 μm in size. We report a process for preparing ultrafine jet-milled powders with an average size of 0.33 μm for Nd-Fe-B sintered magnets: a combination of hydrogenation- disproportionation-desorption-recombination, hydrogen decrepitation, and He jet milling.

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Preparation of ultrafine jet-milled powders for Nd-Fe-B sintered magnets using hydrogenation-disproportionation-desorption-recombination and hydrogen decrepitation processes

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