Property enhancement of bonded Nd-Fe-B magnets by composite adhesive design

Wang, Xi; Liu, Weiqiang; Hu, Ruijin; Yin, Yuxia; Yue, Ming

doi:10.1016/j.matdes.2020.108767

Cited by 12 publications

(7 citation statements)

References 34 publications

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“…The elemental mapping of the hybrid bonded magnets presented in Figure 1C shows that the large particles of NdFeB with the red contrast (Nd), and the fine particles of SmFeN with the blue contrast (Sm). The platelike morphology of the particle tends to self‐align during printing, whereas the finer particles fill in the voids to improve the packing density 22,28–30 . The morphology of a NdFeB PPS magnet is shown in Figure 1D.…”

Section: Resultsmentioning

confidence: 99%

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Thermal stability of anisotropic bonded magnets prepared by additive manufacturing

et al. 2022

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In this research, anisotropic NdFeB + SmFeN hybrid and NdFeB bonded magnets are additively printed in a polyphenylene sulfide (PPS) polymer binder. Printed NdFeB + SmFeN PPS bonded magnets displayed excellent magnetic properties (Br [remanence] = 6.9 kG [0.69 T], Hcj [coercivity] = 8.3 kOe [660 kA/m], and BHmax [energy product] = 9.9 MGOe [79 kJ/m3]) with superior corrosion resistance and thermal stability. The anisotropic NdFeB bonded magnet shows a high coercivity of 14.6 kOe (1162 kA/m) with a BHmax of 8.7 MGOe (69 kJ/m3). The coercivity and remanence temperature coefficients for NdFeB + SmFeN hybrid bonded magnets are −0.10%/K and −0.46%/K, and for NdFeB bonded magnets are −0.14%/K and −0.53%/K in the range of 300–400 K, indicating that the hybrid bonded magnets are thermally stable. The average flux aging loss for hybrid magnets was also determined to be very stable over 2000 h at 448 K (175°C) in air with 2.04% compared to that of NdFeB magnets with 3.62%.

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Section: Resultsmentioning

confidence: 99%

“…The platelike morphology of the particle tends to self-align during printing, whereas the finer particles fill in the voids to improve the packing density. 22,[28][29][30] The morphology of a NdFeB PPS magnet is shown in Figure 1D. The diameter of irregular-shaped NdFeB particles is in the range of about 100-200 μm.…”

Section: Resultsmentioning

confidence: 99%

Thermal stability of anisotropic bonded magnets prepared by additive manufacturing

et al. 2022

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“…It is reported that the viscosities of non-spherical Nd-Fe-B suspensions are generally higher than the viscosities of spherical Nd-Fe-B suspensions. [20][21][22] Therefore, the particle shape and size could not only affect the rheology of the binder but also the loading fraction in the polymer thereby altering the magnetic properties and thermal stability of the bonded magnets.…”

Section: Microstructurementioning

confidence: 99%

Additive Manufacturing of Anisotropic Sm-Fe-N Nylon Bonded Permanent Magnets

Gandha

Paranthaman

Sales

et al. 2021

Preprint

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Fabricating a bonded magnet with a near-net shape in suitable thermoplastic polymer binders is of paramount importance in the development of cost-effective energy technologies. In this work, anisotropic Sm2Fe17N3 (Sm-Fe-N) bonded magnets are additively printed using Sm-Fe-N anisotropic magnetic particles in a polymeric binder polyamide-12 (PA12). The anisotropic bonded permanent magnets are fabricated by Big Area Additive Manufacturing followed by post-aligned in a magnetic field. Optimal post-alignment results in an enhanced remanence of ~ 0.68 T in PA12 reflected in a parallel-oriented (aligned) measured direction. The maximum energy product achieved for the additively printed anisotropic bonded magnet of Sm-Fe-N in PA12 polymer is 78.8 KJ m-3. Our results show advanced processing flexibility of additive manufacturing for the development of Sm-Fe-N bonded magnets in polymer media designed for applications with no critical rare earth magnets.

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“…It is reported that non-spherical NdFeB suspensions generally have higher viscosities than that of the spherical NdFeB suspensions. [24][25][26] Therefore, the particle shape and size could not only affect the rheology of the binder but also the loading fraction in the polymer thereby altering the magnetic and mechanical properties and also thermal stability of the bonded permanent magnets. The structure of 3D printed SmFeN bonded magnets in PA12 was determined by XRD (Figure 2).…”

Section: Microstructurementioning

confidence: 99%

3D printing of anisotropic Sm–Fe–N nylon bonded permanent magnets

Gandha

Paranthaman

Sales

et al. 2021

Engineering Reports

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Fabricating a bonded magnet with a near-net shape in suitable thermoplastic polymer binders is of paramount importance in the development of cost-effective energy technologies. In this work, anisotropic Sm 2 Fe 17 N 3 (Sm-Fe-N) bonded magnets are additively printed using SmFeN anisotropic magnetic particles in a polymeric binder polyamide-12 (PA12). The anisotropic SmFeN bonded magnets are fabricated by Big Area Additive Manufacturing followed by post-printing alignment in a magnetic field. Optimal post-alignment results in an enhanced remanence of ∼0.68 T in PA12 reflected in a parallel-oriented (aligned) measured direction. The maximum energy product achieved for the additively printed anisotropic bonded magnet of Sm-Fe-N in PA12 polymer is 78.8 KJ m −3 . Our results show advanced processing flexibility with 3D printing of the development of SmFeN nylon bonded magnets designed for applications with no critical rare earth magnets.

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Property enhancement of bonded Nd-Fe-B magnets by composite adhesive design

Cited by 12 publications

References 34 publications

Thermal stability of anisotropic bonded magnets prepared by additive manufacturing

Thermal stability of anisotropic bonded magnets prepared by additive manufacturing

Additive Manufacturing of Anisotropic Sm-Fe-N Nylon Bonded Permanent Magnets

3D printing of anisotropic Sm–Fe–N nylon bonded permanent magnets

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