Coercive Force of (Pr, Dy)–(Fe, Co)–B Sintered Materials with a Low Rare-Earth Metal Content

Abstract

Sintered (Pr_0.53Dy_0.47)_ΣR(Fe_0.77Co_0.23)_balB_7.5 materials are studied. For the Nd–Fe–B-based materials, the calculated neodymium content in the Nd₂Fe₁₄B compound is 11.8 at %, whereas an excess neodymium content as compared to that for the stoichiometric composition should be taken for manufacturing magnets. In contrast to the magnets based on the aforementioned system, the magnets based on the Pr–Dy–Fe–Co–B system can be prepared at a lower total rare-earth metal content as compared to that corresponding to the stoichiometric composition. Magnets with a coercive force of 528 kA/m are manufactured at a total rare-earth metal content of 11.5 at %, which is lower than that calculated for the R₂(Fe, Co)₁₄B (R = Pr, Dy) phase.