Nd-Pr-Fe-Co-B-V系急冷薄帯ならびにボンド磁石の磁気特性

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  • Magnetic Properties of Melt-Spun Nd-Pr-Fe-Co-B-V System Alloys and Their Bonded Magnets
  • Nd Pr Fe Co B Vケイ キュウレイ ハクタイ ナラビニ ボンド ジ

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Melt-spun ribbons of Nd-Pr-Fe-Co-B-V system alloys were prepared by the single roller rapidquenching method. The effects of composition, wheel velocity and heat-treatment on the magnetic properties were investigated. The magnetic properties of their isotropic compression bonded magnets prepared from optimally annealed ribbons were also measured. Remanence (Br) was found to increase with decreasing rare-earth content, and a maximum value of more than 1.0T was obtained. A maximum energy product of 164.0kJ/m3 was obtained for (Nd0.5Pr0.5)9Fe74Co8B7.5V1.5 alloy ribbon prepared at a wheel velocity of 17.1m/s. From TEM observation, the particle size of these ribbons was determined to be between 20 to 30nm. It is conjectured that the high remanence is obtained by the interaction of these fine particles. The amorphous (Nd0.5Pr0.5)9Fe74Co8B7.5V1.5 ribbons prepared at a wheel velocity of 20.7m/s were crystalized by heat treatment, and the optimum annealing condition was found to be at 650°C for 20min. Its corresponding valueof. (BH)max was 146.2kJ/m3. A maximum energy product of 86.4kJ/m3 was achieved with (Nd0.5Pr0.5)9Fe74Co8B7.5V1.5 bonded magnets made from the optimally prepared ribbons.

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