The mechanism of enhanced magnetic properties of sintered permanent magnets by substitution of Pr for Nd

Chen, Bicheng; Liu, Xingmin; Chen, Renjie; Guo, Sheng; Lee, Don; Yan, Aru

doi:10.1016/j.jallcom.2011.11.132

Cited by 20 publications

(11 citation statements)

References 13 publications

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“…In this study, we investigated the microstructure and magnetic properties of (Nd 0.8 Pr 0.2 ) 2.2 Fe 14−x Co x B (x = 0, 1.75, 2, 2.25) melt-spun ribbons to understand how Co-substitution for Fe could be employed to tailor the magnetic properties by tuning the distribution, type and chemistry of the intergranular phase. Partial substitution of Nd by Pr is chosen because Pr addition can promote uniform distribution of intergranular phase resulting in an increase of magnetic properties in Nd-Fe-B alloys 20,21 . The results show that the substitution Co for Fe affects the type, chemistry, and distribution of the intergranular phase.…”

Section: Introductionmentioning

confidence: 99%

The effects of Co on the enhancement of magnetic properties by modifying the intergranular phase in Nd-Fe-B alloys

Liang

Deng

Tan

et al. 2019

Sci Rep

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In Nd2Fe14B-based permanent materials, the intergranular phase has a strong influence on magnetic properties. Here, we study the effect of partial substitution of Fe by Co on the microstructure to gain insight into the mechanism of enhancing magnetic properties of (Nd0.8Pr0.2)2.2Fe14−xCoxB (x = 0, 1.75, 2, 2.25) alloys. Our results show that the substitution Co for Fe changes the magnetic properties obviously by tuning the chemistry and distribution of the intergranular phase between hard magnetic grains. In particular, for (Nd0.8Pr0.2)2.2Fe12Co2B (x = 2) alloy, no obvious intergranular phase is observed. And the through-thickness homogeneity and ultrafine microstructure with an average size of ~25 nm is obtained, which produces maximum product ((BH)max) of 141 kJ/m3, 29% higher than that of quaternary alloy. Our findings provide a new idea to design prospective permanent alloys with increased magnetic properties by tuning the distribution and chemical composition of the intergranular phase.

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Section: Introductionmentioning

confidence: 99%

The effects of Co on the enhancement of magnetic properties by modifying the intergranular phase in Nd-Fe-B alloys

Liang

Deng

Tan

et al. 2019

Sci Rep

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“…In this work, we selected Pr and Cu to dilute Dy concentration of the intergranular additive, because Pr not only has a larger natural abundance than Dy but also contributes to a higher H A of Pr 2 Fe 14 B (8.7T) than Nd 2 Fe 14 B [4,14]. In addition, Cu is considered to be excluded in the 2:14:1 phase, having no magnetic dilution effect [15,16].…”

Section: Introductionmentioning

confidence: 99%

Coercivity enhancement of Nd–Fe–B sintered magnets with intergranular adding (Pr, Dy, Cu)−Hx powders

Zhang

Liu

et al. 2016

Journal of Magnetism and Magnetic Materials

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“…Pr is the element most frequently found in Nd-containing ores, but the separation of Nd from Pr is a very difficult process [4]. Additionally, Pr has similar crystal structure, thermal properties, and magnetic properties to Nd so several studies on the development of various types of magnets using Pr as a substitution element for Dy have been performed [5][6][7][8]. Many commercially-available Nd-Fe-B magnets contain Pr.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and magnetic properties of (Nd,Dy)FeB and (Nd,Pr)FeB strips

Park

Kim

Lim

et al. 2015

Journal of the Korean Physical Society

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In this paper, we investigate the effect of Dy and Pr substitution for Nd on the microstructure and the magnetic properties of Nd-Fe-B alloys fabricated by using the strip-casting process. The addition of Dy and Pr changes the melting temperature of the strips, which results in differences in undercooling during solidification. The alteration of undercooling induces variations in the nucleation frequency and the cooling rate in the strips and changes the grain size and alignment. These microstructural changes have a large effect on the coercivity of the strips. The addition of Dy improves the coercivity of the strips due to the presence of more refined and well-oriented grains, which is attributed to the high thermal gradient. The addition of Pr to strips with a low thermal gradient reduces the coercivity due to the large grain size.

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The mechanism of enhanced magnetic properties of sintered permanent magnets by substitution of Pr for Nd

Cited by 20 publications

References 13 publications

The effects of Co on the enhancement of magnetic properties by modifying the intergranular phase in Nd-Fe-B alloys

The effects of Co on the enhancement of magnetic properties by modifying the intergranular phase in Nd-Fe-B alloys

Coercivity enhancement of Nd–Fe–B sintered magnets with intergranular adding (Pr, Dy, Cu)−Hx powders

Microstructure and magnetic properties of (Nd,Dy)FeB and (Nd,Pr)FeB strips

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