Preparation of Mn-diffused Sm-Fe-N core-shell powder by reduction-diffusion process

Matsuura, M.; Yarimizu, Keisuke; Osawa, Yohei; Tezuka, Nobuki; Sugimoto, Satoshi; Ishikawa, Takashi; Yoneyama, Y.

doi:10.1016/j.jmmm.2018.09.084

Cited by 20 publications

(3 citation statements)

References 13 publications

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“…After washing with EG in the GB, the Sm 2 Fe 17 N x / Sm 2 (Fe,M) 17 N x coreshell powders showed higher coercivity than commercial SmFeN powder even after heat-resistance tests in which the powders were annealed at 300°C for 1.5 h under Ar atmosphere. 22,23) We also found that pure SmFeN powder without any additive element prepared by the developed RD process exhibited high coercivity after the heat-resistance test. These results indicated that the improved heat resistance of the SmFeN powder was attributable to washing with EG in a GB.…”

Section: Introductionmentioning

confidence: 62%

“…1721) Our group previously adopted an RD process to prepare Sm 2 Fe 17 N x /Sm 2 (Fe,M) 17 N x (M = Mn or Cr) core shell fine powders that simultaneously exhibited high heat resistance and high saturation magnetization. 22,23) In our RD process, powder mixtures of Sm 2 Fe 17 After annealing, the powders were subjected to nitriding 24) to yield the Sm 2 Fe 17 N x /Sm 2 (Fe,M) 17 N x coreshell structures. In our method, ethylene glycol (EG) was used as the washing solvent instead of water to remove the CaO from the nitrided Sm 2 Fe 17 N x /Sm 2 (Fe,M) 17 N x coreshell powders.…”

Section: Introductionmentioning

confidence: 99%

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Preparation of Highly Heat–Resistant Sm–Fe–N Magnetic Powder by Reduction–Diffusion Process

et al. 2020

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We previously described the preparation of Mn-or Cr-containing coreshell SmFeN powders exhibiting high thermal stability by a reductiondiffusion process, in which powder mixtures of Sm 2 Fe 17 , Sm 2 O 3 , Mn 3 O 4 or Cr 2 O 3 , and Ca were annealed and nitrided followed by the removal of residual CaO by washing with ethylene glycol in a glove box. We also found that SmFeN powder prepared by this process showed high heat resistance even without Mn or Cr addition. In the present work, we investigated the effects of the washing solvent and atmosphere on the coercivity, heat resistance, and microstructure of SmFeN powders. The heat resistance of the SmFeN powders was strongly dependent on their O content. Washing with ethylene glycol rather than water effectively suppressed oxidation during washing. Furthermore, the washing atmosphere also affected the increase in O content of the powders. The SmFeN powder washed with ethylene glycol in a glove box showed high heat resistance and the same microstructure before and after the heat resistance test. In contrast, the powder washed with water in air exhibited low heat resistance owing to the occurrence of ¡-Fe precipitation during the heat resistance test.

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Section: Introductionmentioning

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Preparation of Highly Heat–Resistant Sm–Fe–N Magnetic Powder by Reduction–Diffusion Process

et al. 2020

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“…Today, Sm 2 Fe 17 N 3 powder is mixed with resin binder, and resin-bonded Sm-Fe-N bulk magnets are used in motors. Our group recently reported on Mn- or Cr-diffused Sm 2 Fe 17 N x core-shell powders and Sm-rich shelled Sm 2 Fe 17 N x powder for application in resin-bonded magnets with high thermal stability [ 70–72 ]. To obtain bulk Sm-Fe-N magnets, attention has also fallen on metal-bonded magnets using a low-melting-point metal binder.…”

Section: Development Of High-performance Zn-bonded Sm-fe-n Magnetsmentioning

confidence: 99%

Recent progress in the development of high-performance bonded magnets using rare earth–Fe compounds

Horikawa

Yamazaki

Matsuura

et al. 2021

Science and Technology of Advanced Materials

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Permanent magnets, and particularly rare earth magnets such as Nd-Fe-B, have attracted much attention because of their magnetic properties. There are two wellestablished techniques for obtaining sintered magnets and bonded Nd-Fe-B magnets. Powder metallurgy is used to obtain high-performance anisotropic sintered magnets. To produce bonded magnets, either melt-spinning or the hydrogenation, disproportionation, desorption, and recombination process is used to produce magnet powders, which are then mixed with binders. Since the development of Nd-Fe-B magnets, several kinds of intermetallic compounds have been reported, such as Sm 2 Fe 17 N x and Sm(Fe,M) 12 (M: Ti, V, etc.). However, it is difficult to apply a liquid-phase sintering process similar to the one used for Nd-Fe-B sintered magnets in order to produce high-performance Sm-Fe-based sintered magnets because of the low decomposition temperature of the compound and the lack of a liquid grain boundary phase like that in the Nd-Fe-B system.Therefore, bonded magnets are useful in the production of bulk magnets using these Sm-Fe based compounds. This article reviews recent progress in our work on the development of high-performance bonded magnets using Nd 2 Fe 14 B and Sm 2 Fe 17 N x compounds.

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Synthesis of Sm2Fe17−xSixNy magnetic powder with high coercivity through reduction–diffusion and mechanical milling process

Yu-ping

Zhang

Sun

et al. 2023

J Mater Sci: Mater Electron

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Preparation of Mn-diffused Sm-Fe-N core-shell powder by reduction-diffusion process

Cited by 20 publications

References 13 publications

Preparation of Highly Heat–Resistant Sm–Fe–N Magnetic Powder by Reduction–Diffusion Process

Preparation of Highly Heat–Resistant Sm–Fe–N Magnetic Powder by Reduction–Diffusion Process

Recent progress in the development of high-performance bonded magnets using rare earth–Fe compounds

Synthesis of Sm2Fe17−xSixNy magnetic powder with high coercivity through reduction–diffusion and mechanical milling process

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