Bulk Nanostructural Permanent Magnetic Materials

Yue, Ming; Li, Yuqing; Wu, Qiong; Liu, Weiqiang

doi:10.1166/rnn.2014.1057

Cited by 10 publications

(4 citation statements)

References 48 publications

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“…[8][9][10] Okada et al [11] studied (Ce 0.4 Pr 0.1 Nd 0.5 ) 32.5−34. 5 Fe bal B 1−1.6 sintered magnets, and obtained the best magnetic propertied as (BH) max = 27 MGOe and H cj = 5.3 kOe. Zhu et al [12] reported the remarkable values of (BH) max = 43.…”

Section: Introductionmentioning

confidence: 96%

“…Since Nd-Fe-B magnets were invented in 1983, [1] they are widely used in many fields due to their high magnetic performance, such as hybrid electric vehicles (HEV), wind turbines, voice-coil motor (VCM) devices, magnetic resonance imaging (MRI), etc. [2][3][4][5] In light rare earth, not only the abundance of Nd is less than La and Ce but also its price is much higher, [6] but the magnetic performances of La-Fe-B and Ce-Fe-B are much lower than Nd-Fe-B. [7] Therefore, the substitution of La, Ce for Nd in Nd-Fe-B to find a balance between magnetic performance and cost is an important research domain.…”

Section: Introductionmentioning

confidence: 99%

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Influence of misch metal content on microstructure and magnetic properties of R–Fe–B magnets sintered by dual alloy method

et al. 2017

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MM 14 Fe 79.9 B 6.1 /Nd 13.5 Fe 80.5 B 6 magnets were fabricated by dual alloy method (MM, misch metal). Some magnets have two Curie temperatures. Curie temperatures T c1 corresponds to the main phase which contains more LaCe, and T c1 decreases from 276.5 • C to 256.6 • C with the content of MM increasing from 30.3 at.% to 50.6 at.%. The variation of B r with the increase of MM indicates the existence of inter-grain exchange coupling in the magnets. When MM/R ≤ 30.3 at.%, the magnetic properties can reach the level of the intrinsic coercivity H cj ≥ 7.11 kOe and the maximum energy product (BH) max ≥ 41 MGOe. Compared with Nd, La and Ce are easier to diffuse to the grain boundaries in the sintering process, and this will cause the decrease of H cj . Due to the diffusion between the grains, the atomic ratio of La, Ce, Pr, and Nd in each grain is different and the percentage of Nd in all grains is higher than that in misch metal.

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Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Influence of misch metal content on microstructure and magnetic properties of R–Fe–B magnets sintered by dual alloy method

et al. 2017

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“…Therefore, it is very important to gain a better understanding of the crystallization processes and the final microstructure in melt-spun Nd-Fe-B alloys before infiltration [2,3]. In this sense, many researchers have been working to identify the best fabrication conditions to obtain exchangecoupled nanocomposite Nd-Fe-B-based permanent magnets [4][5][6]. Much of the research has been focused on amorphous samples where different fabrication methods (melt-spinning, mechanical alloying) and annealing treatments were investigated to obtain the best properties.…”

Section: Introductionmentioning

confidence: 99%

Effect of Nb and Cu on the crystallization behavior of under-stoichiometric Nd–Fe–B alloys

Salazar¹,

Martín-Cid²,

Madugundo³

et al. 2016

J. Phys. D: Appl. Phys.

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In this work, we present a complete study of the influence of Nb and Cu addition on the crystallization behavior of Nd-lean Nd-Fe-B melt-spun alloys. Alloys with compositions Nd 10−x−y Fe 84 B 6 Nb x Cu y (x = 1, y = 0 and x = 0.5, y = 0.5) were melt-spun at different wheel speeds (15-40 m s −1) to obtain samples in amorphous, highly disordered and nanocrystalline structures. The crystallization process, induced by different heat treatments, was studied by means of differential thermal analysis and x-ray powder thermodiffraction. Magnetic properties of as-made and heat-treated ribbons were measured by magnetometry. The as-made amorphous samples showed a crystallization to the 2:14:1 hard magnetic phase at T 1 ~ 350 °C. Doping with Nb results in an increase of T 1 , and addition of Cu lowers T 1. This behavior is explained in terms of an inhibition of grain growth by Nb and a nucleation enhancement by Cu additions. During the crystallization process, a secondary phase (identified as a bcc-Fe-rich phase) is formed. The amount of such a phase increases with the annealing temperature. Coercivity increases upon annealing reaching maxima at 700-750 °C. This can be explained in terms of competition between the two phases formed: the 2:14:1 hard phase and the soft bcc-Fe-rich phase. The highest coercivity of the Nd-lean samples is observed when the microstructure is appropriate and both phases are exchange-coupled.

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“…Synthesis of ferromagnetic nanoparticles (NPs) with a single magnetic domain has attracted much attention for the formation of bulk magnet preparation [1][2][3][4]. Recent reports have shown that these ferromagnetic NPs with single magnetic domain, by magnetically oriented assembly, will give higher magnetic performance than that of large MNPs with many magnetic domains [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of magnetic films of well-dispersed single domain of core–shell α″-Fe16N2/Al2O3 nanoparticles

Suhendi

Kartikowati

Zulhijah

et al. 2015

Advanced Powder Technology

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Bulk Nanostructural Permanent Magnetic Materials

Cited by 10 publications

References 48 publications

Influence of misch metal content on microstructure and magnetic properties of R–Fe–B magnets sintered by dual alloy method

Influence of misch metal content on microstructure and magnetic properties of R–Fe–B magnets sintered by dual alloy method

Effect of Nb and Cu on the crystallization behavior of under-stoichiometric Nd–Fe–B alloys

Preparation and characterization of magnetic films of well-dispersed single domain of core–shell α″-Fe16N2/Al2O3 nanoparticles

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