444 kJ/m^3超高性能磁石の開発

概要

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Nd-Fe-B sintered magnets have been growing up rapidly in various application fields; electronics, communications, medical instruments, automobile, servomotors, and so on. The reason is that Nd-Fe-B magnets have excellent magnetic properties, good productivity, and superior energy efficiency. In order to develop new application and new design, further improvements of magnetic properties and cost performance are required. So, extensive studies on processing techniques to achieve extremely high energy-product magnet through the powder metallugical and sintering method have been done. As a result, the highest 444 kJ/m^3 (55.8 MGOe) is realized by controlling the composition and the microstructure of sintered magnets, then exceeding 400 kJ/m^3 (50 MGOe) Nd-Fe-B magnets have been started in mass production. This paper summaries the technological advancement on developing the high performance Nd-Fe-B sintered magnets.
2000-01-01