Rare earth-iron-nitrogen-based magnetic powder, compound for bonded magnet, bonded magnet, and method for producing rare earth-iron-nitrogen-based magnetic powder

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United States of America Patent

PATENT NO 11990259
APP PUB NO 20230245807A1
SERIAL NO

18013072

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Abstract

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A rare earth-iron-nitrogen-based magnetic powder according to this invention contains, as main constituent components, a rare-earth element (R), iron (Fe), and nitrogen (N). Moreover, this magnetic powder has an average particle size of 1.0-10.0 μm, and contains 22.0-30.0 mass % of a rare-earth element (R) and 2.5-4.0 mass % of nitrogen (N). Further, this magnetic powder includes: a core part having any one crystal structure among a Th2Zn17 type, a Th2Ni17 type, and a TbCu7 type; and a shell layer provided on the surface of the core part and having a thickness of 1-30 nm. The shell layer contains a rare-earth element (R) and iron (Fe) so that the R/Fe atomic ratio is 0.3-5.0, and further contains 0-10 at % (exclusive of 0) of nitrogen (N). Furthermore, this magnetic powder contains compound particles composed of a rare-earth element (R) and phosphorus (P).

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Patent Owner(s)

Patent OwnerAddress
TOHOKU UNIVERSITYSENDAI-SHI MIYAGI 980-8577
SUMITOMO METAL MINING CO LTDTOKYO 105-8716

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Ishikawa, Takashi Iwanai-gun, JP 176 1685
Matsuura, Masashi Sendai, JP 11 82
Sugimoto, Satoshi Sendai, JP 66 253
Yoneyama, Yukinobu Iwanai-gun, JP 1 0

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