Fe_3B/Nd_2Fe_<14>B系ナノコンポジット合金におけるナノ組織形成と磁気特性に関する研究に基づく高保磁力型ナノコンポジット磁石の開発

概要

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Basing upon studies of nanocrystallization and kinetic phase selection in Nd-Fe-B-based alloys in a composition range along the tie line between Fe3B and Nd2Fe14B with Nd concentration between approximately 6 and 9 atomic percent, a series of multicomponent Nd-Fe-B-Ti-C nanocomposite permanent magnets have been developed. The newly developed nanocomposite permanent magnets have high coercivity up to about 1 MA/m and remanence of 0.8 T when a high-throughput rapid solidification technique called “strip casting” is applied in the rapid solidification process. Together with the Fe3B/Nd2Fe14B-type, a series of the strip-castable nanocomposite permanent magnets now encompasses magnetic properties ranging from Br = 0.9 T, HcJ = 360 kA/m to Br = 0.8 T, HcJ = 1000 kA/m. Owing to the low concentration of rare earth elements in the material, powders obtained from these nanocomposite permanent magnets show excellent oxidation resistance, which makes these powders suitable for resin-bonded magnet applications. Particularly injection-molded magnets using thermoplastic resins of a high melting temperature and the high coercivity grade powders show excellent thermal stability.
社団法人粉体粉末冶金協会の論文
2005-03-15