Didymium-Fe-B sintered permanent magnets

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Abstract
Present works describe the developments the low cost R‐Fe‐B sintered permanent magnets. Three different didymiums are chosen for the low cost mixtures of rare‐earth elements. The studied alloy compositions are Fe‐(32.5–34.5)wt. %R‐(1–1.6)wt. %B, where R elements are didymium (Nd‐10wt. %Pr), 5Ce‐didymium (Nd‐15%Pr‐5%Ce), and 40 Ce‐didymium (Nd‐10%Pr‐40%Ce). The specimens were prepared by the conventional powder metallurgical techniques. The best magnetic properties obtained in this studies are Br=13.2 kG, iHc=10.2 kOe, and (BH)max=40 MGOe with the Fe‐33.5% (5Ce‐didymium)‐1%B alloy. Temperature dependence of iHc of this alloy is almost comparable to that of the Nd‐Fe‐B alloys.