Current status of Nd-Fe-B permanent magnet materials

Hirosawa, S.; Hanaki, Atsushi; Tomizawa, H.; Hamamura, Atsushi

doi:10.1016/0921-4526(90)90068-6

Cited by 20 publications

(6 citation statements)

References 24 publications

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“…When the samples are hot deformed, the value of β becomes identical to that observed in anisotropic sintered magnets. The N eff value in rapidly solidified isotropic magnets is smaller than in anisotropic magnets, probably due to the decrease of the magnetic stray field as a result of random orientation of neighbouring grains magnetizations (Hirosawa et al 1990a).…”

Section: The Reversible Coefficients Of Remanent Induction and Coerci...mentioning

confidence: 90%

“…Changes in the microstructure were shown. The presence of RCu (R = Pr, Nd) (Hirosawa et al 1990a, Tenaud et al 1990a, b, Fidler and Bernardi 1991, NdCu 2 (Szymura et al 1993) or the formation of the intergranular R 6 Fe 13 Cu (Shimoda et al 1988a, Kajitani et al 1992, Kianvash and Harris 1990, Knoch et al 1992a, Velicescu et al 1996 phases were reported. The R 6 Fe 13 Cu phase has only been detected in the microstructure of the magnets with a low boron concentration (Kajitani et al 1992, Velicescu et al 1996.…”

Section: Nonmagnetic Elementsmentioning

confidence: 96%

“…The part played by microstructure is described by the parameters c and N eff . Hirosawa et al (1990a) computed the dependencies of i H c and β on c and N eff parameters, according to relation (23). The theoretical limit of the temperature dependence of i H c was about −0.36% K −1 for ternary Nd-Fe-B magnets in the temperature range 300-420 K. Practical limits were determined by actual values c and N eff which must be obtained empirically.…”

Section: The Reversible Coefficients Of Remanent Induction and Coerci...mentioning

confidence: 99%

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Permanent magnets based on R-Fe-B and R-Fe-C alloys

Burzo

1998

Rep. Prog. Phys.

210

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A review is given on the basic properties of 2:14:1 hard magnetic phases as well as technological procedures used for manufacturing R-Fe-B and R-Fe-C permanent magnets. First, we analyse the phase diagrams, crystal structure of hard magnetic phases and composition ranges in which these phases form solid solutions, as a result of various types of substitution. Then, the magnetic properties of R 2 Fe 14 B-, R 2 Fe 14 C-and R 2 Co 14 Bbased compounds are described. The routes used for manufacturing R-Fe-B and R-Fe-C permanent magnets are detailed. The magnets' microstructure as well as their coercivities are described in correlation with composition and manufacturing routes. The properties of nanostructure magnets are then presented. Finally, the stability of Nd-Fe-B and Nd-Fe-C magnets in various working conditions is analysed.

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Section: The Reversible Coefficients Of Remanent Induction and Coerci...mentioning

confidence: 90%

Section: Nonmagnetic Elementsmentioning

confidence: 96%

Section: The Reversible Coefficients Of Remanent Induction and Coerci...mentioning

confidence: 99%

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Permanent magnets based on R-Fe-B and R-Fe-C alloys

Burzo

1998

Rep. Prog. Phys.

210

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“…The upper limit for the coercive field is the anisotropy field [16]. Some authors [17][18][19][20][21] proposed alterations in the Eq. (3).…”

Section: Effect Of Demagnetizing Fieldmentioning

confidence: 99%

Nucleation as Coercivity Mechanism in NdFeB Magnets

Campos

Flavio²

2014

MSF

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In the first part of this article, the SW-CLC (Stoner-Wohlfarth with CLC modification) model is discussed for nanocrystalline magnets, as melt-spun exchange coupled NdFeB. In the second part, the effect of grain size of coercivity for large grain size, above the single domain particle size, is addressed. The Kondorsky law observed for large grain size only can be due to domain wall displacement phenomena, where there is nucleus expansion. There are two main situations, one for nanocrystalline grain size, where the SW-CLC model is obeyed, and other for large grain size, where the coercive field decreases proportionally to the square root of the grain size.

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“…(3) offers two possible avenues. If the remanence is not at a premium one may use alloy compositions less close to the stoichiometric composition than in case (11, and a different choice of the additives to reach microstructures of sintered magnets with more favourable a and IV& values [6]. A further coercivity improvement can be reached by increasing K,.…”

Section: Lhsearch Netsmentioning

confidence: 99%