Composite bonded magnets with controlled anisotropy directions prepared by viscous deformation technique

Yamashita, F.; Kawamura, Kazutaka; Okada, Yukihiro; Murakami, Hiroshi; Ogushi, Masaki; Nakano, Masaki; Fukunaga, H.

doi:10.1016/j.jmmm.2007.02.045

Cited by 12 publications

(2 citation statements)

References 3 publications

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“…Most rare-earth bonded magnets are isotropic because the magnetic powders used for producing bonded magnets are isotropic. Although attempts have been made to produce anisotropic bonded rare-earth magnets based on Nd-Fe-B and Sm-Fe-N micrometre-sized powder particles [5][6][7][8] production of nanoscale anisotropic rare-earth magnetic powder particles remains a significant challenge.…”

Section: Introductionmentioning

confidence: 99%

Anisotropic bonded magnets fabricated via surfactant-assisted ball milling and magnetic-field processing

Poudyal¹,

Nguyen²,

Rong³

et al. 2011

J. Phys. D: Appl. Phys.

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Anisotropic bonded magnets are fabricated by surfactant-assisted ball milling in a magnetic field and magnetic field alignment of the milled chip-like nanoparticles of the Sm-Co and Nd-Fe-B materials. It is found that the application of magnetic fields during the ball milling strengthens the anisotropy of the chips and therefore improves the alignment. For SmCo 5 phase-based chips, for instance, energy products up to 26.0 MG Oe and 19.1 MG Oe are obtained for the chips and the bonded magnets, respectively. This combined technique opens a new approach to the fabrication of anisotropic bonded magnets for various applications.

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Section: Introductionmentioning

confidence: 99%

Anisotropic bonded magnets fabricated via surfactant-assisted ball milling and magnetic-field processing

Poudyal¹,

Nguyen²,

Rong³

et al. 2011

J. Phys. D: Appl. Phys.

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“…This contribution reports an optimized preparation process for an arc-shape magnet with continuously controlled direction of anisotropy by taking advantage of the previously reported technique [1] in order to apply it to an outer rotor. The magnetic properties of the arc-shaped magnets did not degrade through the process.…”

Section: Introductionmentioning

confidence: 99%

Preparation of ring-shaped composite bonded magnets with continuously controlled anisotropy distribution for internal space

Yamashita

Yamada

Ohya

et al. 2010

J. Phys.: Conf. Ser.

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Abstract. We have already reported an advanced method for producing a radially-anisotropic rare earth composite bonded magnet with continuously controlled direction of anisotropy. The magnet has been applied to an inner rotor as a practical usage. In this study, the outstanding preparation method was adopted into the preparation of a magnet applied for an outer rotor. An optimized condition of extrusion and compaction at an elevated temperature could be obtained. In addition, a low pressure configuration to the ring-shaped magnet from plural preformed magnets was carried out, which had specific distribution of magnetic anisotropy for internal space for a small motor, by using self recoverability based on the viscous deformation without an alignment field. No deterioration of magnetic properties was detected through the process even if those magnets were miniaturized. Resultantly, the (BH) max of a ring-shaped magnet with the continuously controlled direction of magnetic anisotropy attained the value of 186 kJ/m 3 , and we obtained sine-wave magnetic anisotropy distribution, even if those magnets were miniaturized. IntroductionFurther improvements in performance of small motors are strongly required from the standpoints of environment protection and saving of resources. In order to realize a high efficiency motor, a miniaturized magnet with excellent magnetic properties is indispensable.This contribution reports an optimized preparation process for an arc-shape magnet with continuously controlled direction of anisotropy by taking advantage of the previously reported technique [1] in order to apply it to an outer rotor. The magnetic properties of the arc-shaped magnets did not degrade through the process. It was also clarified that the direction of anisotropy in the ring-shaped magnets can be controlled continuously under an application of an alignment field with one direction together with a mechanical design of preformed magnets before deformation. Finally, we succeeded in obtaining a 12 pole ring shaped magnet with (BH) max and remanence values of 186 kJ/m 3 and 1.03 T, respectively, and static magnetic field for internal space can be detected.

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Preparation of anisotropic bonded NdFeB/SmFeN hybrid magnets by mixing two different size powders

Sun

Gao

et al. 2018

Journal of Magnetism and Magnetic Materials

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Composite bonded magnets with controlled anisotropy directions prepared by viscous deformation technique

Cited by 12 publications

References 3 publications

Anisotropic bonded magnets fabricated via surfactant-assisted ball milling and magnetic-field processing

Anisotropic bonded magnets fabricated via surfactant-assisted ball milling and magnetic-field processing

Preparation of ring-shaped composite bonded magnets with continuously controlled anisotropy distribution for internal space

Preparation of anisotropic bonded NdFeB/SmFeN hybrid magnets by mixing two different size powders

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