Effect of the Binder and Some Additives on Properties of the Anisotropic Injection Bonded Nd-Fe-B Magnets

Zhang, Xiaolei; Zhu, Min; Liu, Ying; Jin, Hongming; Tian, Ye; Wang, Zhun; Yang, Qiuping

doi:10.1016/s1875-5372(10)60005-7

Cited by 9 publications

(4 citation statements)

References 6 publications

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“…Moreover, good interfacial compatibility between the magnetic powders and the polymer matrix was a necessary condition for high-performance bonded magnets. Therefore, it was necessary to add a coupling reagent (KH550) to modify the interface between the Nd–Fe–B phase and the polymer matrix. , Furthermore, a certain amount of lubricant (lithium stearate) had to be added to avoid failure of the molding due to excessive friction during magnet compression molding. , The structure and content of components in the polymer matrix are shown in Scheme and Table .…”

Section: Resultsmentioning

confidence: 99%

“…The chemical structure of the stearates in resin oligomers did not change significantly. Epoxy resins and stearates are common binders and lubricants. − ,, The small amount of diisobutyl phthalate and its derivatives in the resin oligomers can be used as plasticizers . Therefore, resin oligomers can be simply treated and reused as a polymer matrix for bonding magnets.…”

Section: Resultsmentioning

confidence: 99%

“…38,39 Furthermore, a certain amount of lubricant (lithium stearate) had to be added to avoid failure of the molding due to excessive friction during magnet compression molding. 40,41 The structure and content of components in the polymer matrix are shown in Scheme 1 and Table 3.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Recycling Bonded Nd–Fe–B Magnet Wastes by Chemical Reaction and Its Mechanism

et al. 2023

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The difficulty of short-process bonded Nd–Fe–B magnet waste recycling lies in the effective removal of the cured polymer matrix while protecting the magnetic powder. In this study, the polymer matrix in bonded Nd–Fe–B magnet waste was destroyed using sodium hydroxide ethanol solution, and the effect of the recycling process on the magnetic powders was studied. The nonmagnetic polymer matrix was removed, while the magnetic phase was not destroyed. The carbon and oxygen contents of the recycled magnetic powders decreased by 92.96 and 89.30%, respectively, while the M S (saturation magnetization), M r (remanence), and H cj (coercivity) values of the recycled magnetic powders were 99.8, 98.5, and 95.9% of the original magnetic powders, respectively. The curing and decomposition processes of the polymer matrix were also analyzed. During the curing process, dicyandiamide and bisphenol A epoxy resin acted as bridges and skeletons, respectively, finally forming a thermosetting three-dimensional network structure. In the alkaline alcohol solution, the bridges and skeletons were destroyed by the free hydroxyl groups and free hydrogen radicals in ethanol, and small molecular products were dissolved in the solution.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Recycling Bonded Nd–Fe–B Magnet Wastes by Chemical Reaction and Its Mechanism

et al. 2023

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“…Different types of bonded magnets have been realized [11], some utilizing magnetic grains already covered with polymeric material [12] and others with the adoption of different fillers, both present in literature [13], [14], and already proposed by the authors [9], [10].…”

Section: Introductionmentioning

confidence: 99%

Impact of a Bonded-Magnet Adoption on a Specific Fractional Motor Power and Efficiency

Ferraris

Franchini

Pošković

et al. 2014

IEEE Trans. on Ind. Applicat.

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The problem of evaluating the impact on the efficiency consequent to the adoption of bonded magnets in substitution of ferrites in small permanent-magnet machines is faced. That is necessary for the development of the main object of this paper: The evaluation of the obtainable performances of a specific brushless dc motor fractional motor through simple substitution of bonded magnets proposed by the authors to the ferrite magnets used up to now. The final aim is to make clear the practical adoptability of the proposal. Several prototypes produced in the authors' laboratories have been tested, and a long experimental activity has been carried on. In particular, the focus of the work has been the identification and separation of the iron losses, both hysteresis and eddy currents, from the contribution of the bearings. The corresponding torques have been calculated, and the energetic behaviors of the original machine with ferrites and the prototypes with phenolic bonded magnets have been analyzed. The satisfactory impact on the efficiency and the improvement of the output power of the motor with bonded magnets let possible to consider the analyzed solution as realistically adoptable.

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