Fe-Ni based alloys as rare-earth free gap permanent magnets

Ochirkhuyag, T.; Tuvshin, D.; Tsevelmaa, T.; Hong, S.C.; Odbadrakh, Kh.; Odkhuu, D.

doi:10.1016/j.actamat.2024.119755

Cited by 1 publication

(1 citation statement)

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“…The development of permanent magnets that contain no or only very small amounts of critical rare earth (RE) elements and close the current performance gap between hard ferrite and FeNdB is becoming increasingly important. Hard magnetic phases such as Mnbased MnAl(C), Mn2Ga and MnBi [1,2], L10-FeNi [3][4][5], α-Fe16N2 [2,6], or phases with ThMn12 structure such as NdFe12(Nx) [7] or Sm(Fe,V)12 [8,9] can serve as the technical basis for such gap magnets. The prerequisite for such gap magnets is sufficiently good intrinsic magnetic properties, in particular anisotropy constant K1 and saturation polarization Js.…”

Section: Introductionmentioning

confidence: 99%

Exploring Sintered Fe-(Ce, Nd)-B with High Degree of Cerium Substitution as Potential Gap Magnet

Goll,

Loeffler,

Boettle

et al. 2024

Materials

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The more effective use of readily available Ce in FeNdB sintered magnets is an important step towards more resource-efficient, sustainable, and cost-effective permanent magnets. These magnets have the potential to bridge the gap between high-performance FeNdB and hard ferrite magnets. However, for higher degrees of cerium substitution (>25%), the magnetic properties deteriorate due to the lower intrinsic magnetic properties of Fe14Ce2B and the formation of the Laves phase Fe2Ce in the grain boundaries. In this paper, sintered magnets with the composition Fe70.9-(CexNd1-x)18.8-B5.8-M4.5 (M = Co, Ti, Al, Ga, and Cu; with Ti, Al, Ga, and Cu less than 2.0 at% in total and Cobal; x = 0.5 and 0.75) were fabricated and analyzed. It was possible to obtain coercive fields for higher degrees of Ce substitution, which previous commercially available magnets have only shown for significantly lower degrees of Ce substitution. For x = 0.5, coercivity, remanence, and maximum energy product of µ0Hc = 1.29 T (Hc = 1026 kA/m), Jr = 1.02 T, and (BH)max = 176.5 kJ/m3 were achieved at room temperature for x = 0.75 µ0Hc = 0.72 T (Hc = 573 kA/m), Jr = 0.80 T, and (BH)max = 114.5 kJ/m3, respectively.

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