Magnetic properties and rare earth element diffusion behavior of hot-deformed nanocrystalline dual-main-phase Nd–Ce–Fe–B magnets

Fan, Wenbing; Zhou, Baowen; He, Jiayi; Liao, Xuefeng; Wu, Yezhou; Yu, Hongya; Wei, Jiangxiong; Liu, Zhongwu

doi:10.1039/d2ra08291h

Cited by 5 publications

(2 citation statements)

References 34 publications

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“…It has been reported that, the coercivity temperature coefficient β for melt-spun Nd-Fe-B and Ce-Fe-B ribbons are generally about −0.30~−0.40%/K and −0.50~−0.60%/K [14,27,28]. The β values of HDed Nd-Fe-B and Ce-Fe-B magnets in 300-400 K are −0.570%/K and −0.530%/K [29]. Therefore, Y-Ho-Fe-B magnets are superior in terms of thermal stability.…”

Section: 3mentioning

confidence: 99%

Exploring Ho substituted Y-Fe-B nanocrystalline alloys and hot worked magnets

Fan,

Zhou,

et al. 2024

Mater. Res. Express

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Aiming to balance the utilization of rare earth (RE) resources and develop Y-Fe-B based permanent magnets, Ho is employed as strategic substitution for enhancing the magnetic properties and thermal stability of nanocrystalline Y-Fe-B alloys. Ho substituting Y can enhance the coercivity of Y-Fe-B alloys while maintaining their excellent thermal stability. 30 at.% Ho substitution leads to an abnormal increase of remanence J r and (Y0.7Ho0.3)2Fe14B alloy exhibits good magnetic properties with remanence J r = 0.73 T, intrinsic coercivity H cj = 303 kA m−1, and maximum energy product (BH)max = 66 kJ m−3. High thermal stability with temperature coefficient of remanence α = −0.124%/K and temperature coefficient of coercivity β = −0.245%/K were obtained between 300–400 K. The results for RE-rich (Y1−xHox)2.5Fe14B alloys also show that the magnetic properties change with Ho content are similar to those of (Y1−xHox)2Fe14B alloys, but the coercivity is higher. In addition, nanocrystalline (Y0.5Ho0.5)2.5Fe14B magnets were prepared by hot-pressing and hot deformation process. Due to the lack of low melting point RE-rich phase, this alloy is difficult to be densified and deformed. The formation of high temperature RE2O3 and RE6Fe23 phases and the lack of continuously distributed RE-rich grain boundary phase are responsible for the poor texture of hot deformed magnet. The hot deformed magnet has the magnetic properties of J r = 0.50 T, H cj = 739 kA m−1, and (BH)max = 40 kJ m−3 together with high thermal stability. The micro-analysis demonstrated the chemical segregation of Y and Ho elements. Higher proportion of Ho than Y existed in main phase and grain boundary phase indicate excess Y were precipitated as Y-rich oxides.

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Section: 3mentioning

confidence: 99%

Exploring Ho substituted Y-Fe-B nanocrystalline alloys and hot worked magnets

Fan,

Zhou,

et al. 2024

Mater. Res. Express

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“…From a strategic point of view, the partial substitution of the more critical neodymium (Nd) with Ce in FeNdB permanent magnets (with as much Ce as possible) is therefore interesting in terms of resource and economic efficiency and sustainability [14,15]. This applies equally to all types (sintered [14][15][16], melt-spun [15,[17][18][19], hot-deformed [15,[20][21][22][23]) of today's most powerful FeNdB magnets. However, there are significant differences between the Fe-Ce-B system and the Fe-Nd-B system, particularly with regard to intrinsic magnetic properties of the hard magnetic 14:2:1 phase, phase equilibria, and the resulting microstructures and magnetic properties.…”

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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Comparative study of Pr/PrFe/PrAl grain boundary diffusion processed Nd–Ce–Fe–B sintered magnets with high Ce substitution: Evolutionary microstructure and magnetic responses

Bai

Chen

et al. 2023

Acta Materialia

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Magnetic properties and rare earth element diffusion behavior of hot-deformed nanocrystalline dual-main-phase Nd–Ce–Fe–B magnets

Abstract: To inhibit the magnetic dilution effect of Ce in Nd–Ce–Fe–B magnets, a dual-alloy method is employed to prepare hot-deformed dual-main-phase (DMP) magnets using mixed nanocrystalline Nd–Fe–B and Ce–Fe–B powders.

Cited by 5 publications

References 34 publications

Exploring Ho substituted Y-Fe-B nanocrystalline alloys and hot worked magnets

Exploring Ho substituted Y-Fe-B nanocrystalline alloys and hot worked magnets

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

Comparative study of Pr/PrFe/PrAl grain boundary diffusion processed Nd–Ce–Fe–B sintered magnets with high Ce substitution: Evolutionary microstructure and magnetic responses

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