Nissan Motor Company Limited

Katsuhiko Mori

Makoto Kano

Ryoji Nakayama

Tetsurou Tayu

Yoshio Kawashita

Muneaki Watanabe

Koichiro Morimoto

Hideaki Ono

Munekatsu Shimada

Takae Ono, Legal Representative

This rare earth magnet having high strength and high electrical resistance has a structure including an R&#x2014;Fe&#x2014;B-based rare earth magnet particleswhich are enclosed with a high strength and high electrical resistance composite layer. The high strength and high electrical resistance composite layeris constituted from a glass-based layerthat has a structure comprising a glass phase or R oxide particlesdispersed in glass phase, and R oxide particle-based mixture layersthat are formed on both sides of the glass-based layerand contain an R-rich alloy phasewhich contains 50 atomic % or more of R in the grain boundary of the R oxide particles.

Rare earth magnet having high strength and high electrical resistance

This rare earth magnet having high strength and high electrical resistance has a structure including an R&#x2014;Fe&#x2014;B-based rare earth magnet particleswhich are enclosed with a high strength and high electrical resistance composite layer. The high strength and high electrical resistance composite layeris constituted from a glass-based layerthat has a structure comprising a glass phase or R oxide particlesdispersed in glass phase, and R oxide particle-based mixture layersthat are formed on both sides of the glass-based layerand contain an R-rich alloy phasewhich containsatomic % or more of R in the grain boundary of the R oxide particles.

A rare earth magnet powder has a chemical composition which includes R: 5 to 20% (wherein, R represents one or two or more rare earth elements being inclusive of Y but exclusive of Dy and Tb), one or two of Dy and Tb: 0.01 to 10%, and B: 3 to 20%, with the balance comprising Fe and inevitable impurities; and an average particle diameter of 10 to 1,000 &#x3bc;m, wherein 70% or more of the entire surface of the rare earth magnet powder is covered with a layer being rich in the content of one or two of Dy and Tb and having a thickness of 0.05 to 50 &#x3bc;m.

Rare earth magnet powder and method of producing the same

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Naka-gun, Japan

Katsuhiko Mori