Partial Substitution of Sm with Praseodymium in R₂(TM)₁₇ Resin Bonded Magnets

Abstract

This paper describes the magnetic properties of resin-bonded magnets having the composition R(Co.₆₇₂Cu.₀₈Fe.₂₂Zr.₀₂₈)_8.35. This composition is able to possess a high intrinsic coercivity(iHc) only when Sm is adopted as the rare earth element. We studied the effects of partial substitution of Sm with Pr in Sm(TM)_8.35. The obtained results were as follows:
1) Saturation magnetization increased and the optimum solid solution heat treatment temperature decreased as the Pr content was increased.
2) Magnetic properties such as (BH)max=14.5MGOe, Br=8.1kG, iHc=10.6k0e were achieved in Sm.₅Pr.₅(TM)_8.35 resin bonded magnet. The achieved values are comparable to those of Sm(TM)_8.35 magnets.