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

Ma, Bin; Sun, Aizhi; Gao, Xuexu; Bao, Xiaoqian; Li, Jiheng; Lang, Huizhen

doi:10.1016/j.jmmm.2017.11.097

Cited by 21 publications

(9 citation statements)

References 24 publications

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“…High magnetic properties can be reached by increasing the filler content or mixing different particle sizes so that smaller particles can fill the gaps between the greater ones. However, the orientation of the magnetic moments can be disturbed by particle interactions, which are more likely to occur if the filler content is high [17].…”

Section: Magnetic Propertiesmentioning

confidence: 99%

Understanding the Effect of Material Parameters on the Processability of Injection-Molded Thermoset-Based Bonded Magnets

Rösel

Drummer

2022

Magnetism

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The applications of bonded magnets in the field of injection-molded samples can be expanded by thermoset-based polymer-bonded magnets, as thermosets provide the opportunity to comply with the demands of, for example, the chemical industry or pump systems in drive applications through to their improved chemical and thermal resistance, viscosity and creep behaviour, especially compared to thermoplastic-based magnets. This paper investigates the influence of the matrix material (epoxy resin, phenolic resin), the filler type (strontium-ferrite-oxide, neodymium-iron-boron) and the filler grade on the reaction kinetics and the viscosity. Based on the determination of the impact, the theory of the network structure is founded. The network and the cross-linked structure are essential to know, as they significantly define not only the material but also the sample behaviour. The correlation between the material system and the mechanical as well as the magnetic properties is portrayed based on the general understanding of the behaviour in terms of the reaction kinetics and the viscosity as well as the theory of the network structure. With that, a basic understanding of the correlation within the material system (matrix, filler, filler grade) and between the reaction kinetics, the network and the cross-linked structure was determined, which gives the opportunity to change the mechanical and the magnetic properties based on the analyzed impact factors and to expand the applications of bonded magnets in the field of thermoset-based ones.

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Section: Magnetic Propertiesmentioning

confidence: 99%

Understanding the Effect of Material Parameters on the Processability of Injection-Molded Thermoset-Based Bonded Magnets

Rösel

Drummer

2022

Magnetism

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“…Taking into account that thermosets reveal a lower viscosity within the molten mass in the cavity relative to thermoplastics, the possibility of orientation is more likely in a thermoset based polymer bonded magnet especially in the edge zone where rapid cooling takes place for thermoplastics. Magnetic properties can be further increased by mixing different particle sizes in that way that smaller particles can fill the gaps between the bigger ones [21].…”

Section: Magnetic Propertiesmentioning

confidence: 99%

Correlation between the Flow and Curing Behavior of Hard Magnetic Fillers in Thermosets and the Magnetic Properties

Rösel

Drummer

2021

Magnetism

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Polymer bonded magnets based on thermoplastics are economically produced by the injection molding process for applications in sensor and drive technology. Especially the lack of orientation in the edge layer, as well as the chemical resistance and the creep behavior limit the possible implementations of thermoplastic based polymer bonded magnets. However, thermoset based polymer bonded magnets have the opportunity to expand the applications by complying with the demands of the chemical industry or pump systems through to improved chemical and thermal resistance, viscosity and creep behavior of thermosets. This paper investigates the influence of hard magnetic particles on the flow and curing behavior of highly filled thermoset compounds based on an epoxy resin. The basic understanding of the behavior of those highly filled hard magnetic thermoset systems is essential for the fabrication of polymer bonded magnets based on thermosets in the injection molding process. It is shown that several factors like the crystal structure, the particle shape and size, as well as the thermal conductivity and the adherence between filler and matrix influence the flow and curing behavior of highly filled thermoset compounds based on epoxy resin. However, these influencing factors can be applied to any filler system with respect to a high filler amount in a thermoset compound, as they are based on the material behavior of particles. Further, the impact of the flow and curing behavior on the magnetic properties of polymer bonded magnets based on thermosets is shown. With that, the correlation between material based factors and magnetic properties within thermosets are portrayed.

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“…The hybrid bonded magnet is composed of two or more different types of magnetic powder to achieve a predened target performance such as maximum energy product or thermal stability, etc. [27][28][29][30][31][32] For example, the Nd-Fe-B/ferrite hybrid bonded magnet shows magnetic properties that are lower as compared to Nd-Fe-B but better than that of ferrite magnets. 27,29 However, the Nd-Fe-B/Sm-Fe-N hybrid magnets have thermal stability with magnetic properties that are better than those of Nd-Fe-B bonded magnets.…”

Section: Introductionmentioning

confidence: 99%

Packing bimodal magnetic particles to fabricate highly dense anisotropic rare earth bonded permanent magnets

et al. 2023

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

Cited by 21 publications

References 24 publications

Understanding the Effect of Material Parameters on the Processability of Injection-Molded Thermoset-Based Bonded Magnets

Understanding the Effect of Material Parameters on the Processability of Injection-Molded Thermoset-Based Bonded Magnets

Correlation between the Flow and Curing Behavior of Hard Magnetic Fillers in Thermosets and the Magnetic Properties

Packing bimodal magnetic particles to fabricate highly dense anisotropic rare earth bonded permanent magnets

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