Abstract
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.
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