Magnetic and microstructural study of hybrid magnet consisting of R-rich and R-lean Nd–Fe–B alloys

Kwon, Hansang; Hadjipanayis, G. C.

doi:10.1016/j.jmmm.2006.10.1067

Cited by 15 publications

(3 citation statements)

References 5 publications

(7 reference statements)

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“…The goal of the work is to replace the traditional material of a magnetic pickup with a hybrid magnetic composite (HMC) material [21], [22], realized with a soft and a hard part and held together by a plastic binder [23], [24]. Such material should reflect the performance of the original materials with low coercivity and an adequate remanence.…”

Section: Scope Of Workmentioning

confidence: 99%

Hybrid magnetic composite (HMC) materials for sensor applications

Ferraris

Franchini

Pošković

2016

2016 IEEE Sensors Applications Symposium (SAS)

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Several applications adopt electromagnetic sensors, that base their principle on the presence of magnets realized with specific magnetic materials that show a rather high remanence, but low coercivity. This work concerns the production, analysis and characterization of hybrid composite materials, with the use of metal powders, which aim to reach those specific properties. In order to obtain the best coercivity and remanence characteristics various "recipes" have been used with different percentages of soft and hard magnetic materials, bonded together by a plastic binder. The goal was to find out the interdependence between the magnetic powder composition and the characteristics of the final material. Soft magnetic material (special Fe powder) has been used to obtain a low coercivity value, while hard materials were primarily used for maintaining a good induction remanence; by increasing the soft proportion a higher magnetic permeability has been also obtained. All the selected materials have been characterized and then tested; in order to verify the validity of the proposed materials two practical tests have been performed. Special magnets have been realized for a comparison with original ones (AlNiCo and ferrite) for two experimental cases: the first is consisting in an encoder realized through a toothed wheel, the second regards the special system used for the electric guitars.

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Section: Scope Of Workmentioning

confidence: 99%

Hybrid magnetic composite (HMC) materials for sensor applications

Ferraris

Franchini

Pošković

2016

2016 IEEE Sensors Applications Symposium (SAS)

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“…NdFeB-type nanocomposites (including Nd 2 Fe 14 B/α-Fe and Nd 2 Fe 14 B/Fe 3 B) have been widely studied for the bonded magnet application [1][2][3] due to the theoretical expectations of achieving high maximum energy product reaching about 1090 kJ/m 3 [4][5] and the effect of remanence enhancement induced by the intergranular exchange interaction [6][7][8][9]. The enhanced remanence could result in relatively high maximum energy products in alloys with limited amounts of rare-earth elements.…”

Section: Introductionmentioning

confidence: 99%

Magnetic properties of Nd2Fe14B/α-Fe nanocomposite magnets with yttrium addition

2010

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The phase evolution and magnetic properties of Nd 9−x Y x Fe 72 Ti 2 Zr 2 B 15 (x = 0, 0.5, 1, and 2) melt-spun nanocomposite ribbons were studied. It is found that Y addition not only enhances the formability of amorphous phase in the alloy, but also stabilizes the amorphous phase during the annealing treatment. The appropriate content of Y addition effectively enhances the remanence (J r ) of the annealed sample. The residual amorphous intergranular phase in the annealed sample optimizes the squareness of the loop, resulting in an larger maximum energy product (BH) max . The best magnetic properties, J r = 0.78 T, H ci (coercivity) = 923.4 kA/m, and (BH) max = 98.5 kJ/m 3 , were obtained from the Nd 8 YFe 72 Ti 2 Zr 2 B 15 ribbon spun at V s = 4 m/s and annealed at 700°C for 10 min, which is composed of Nd 2 Fe 14 B, α-Fe, and amorphous phase.

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“…Nanograin NdFeB hard magnets have attracted much attention due to the effect of remanence (J r ) enhancement induced by the intergranular exchange interaction [1][2][3][4]. Some researches have been carried out on the effect of Dy substitution in the Nd-Fe-B system [5][6].…”

Section: Introductionmentioning

confidence: 99%

Effect of Dy substitution on the microstructure and magnetic properties of nanograin Nd-Fe-B single-phase alloys

Chen

Luo

Guo

2010

Int J Miner Metall Mater

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Nanocrystalline single-phase alloys with the nominal compositions (at%) of Nd 12.3−x Dy x Fe 79.7 Zr 0.8 Nb 0.8 Cu 0.4 B 6.0 (x=0, 0.5, 1.5, and 2.5) were prepared by melt-spinning and subsequent annealing. X-ray diffraction analysis shows that the as-spun ribbons were mainly composed of the amorphous phase. A slight content of Dy stabilizes the amorphous phase during annealing treatment. The grain size becomes smaller and the coercivity of the annealed ribbon is gradually improved with the increase of Dy content. Excessive Dy is harmful to the remanence. It is found that no intergranular phase exists between the grains by high-resolution transmission electron microscopy, and the grain boundaries are crystallographically coherent in the optimally annealed sample. The optimum magnetic properties of remanence (J r =1.09 T), coercivity (H ci =1048 kA/m), and maximum magnetic energy product ((BH) m =169.5 kJ/m 3 ) are obtained from the x=0.5 ribbon in a post heat-treated state (700°C, 10 min).

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Magnetic and microstructural study of hybrid magnet consisting of R-rich and R-lean Nd–Fe–B alloys

Cited by 15 publications

References 5 publications

Hybrid magnetic composite (HMC) materials for sensor applications

Hybrid magnetic composite (HMC) materials for sensor applications

Magnetic properties of Nd2Fe14B/α-Fe nanocomposite magnets with yttrium addition

Effect of Dy substitution on the microstructure and magnetic properties of nanograin Nd-Fe-B single-phase alloys

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