Magnetic properties of Sm–Fe–N thick films produced by compression shearing

Saito, Tetsuji; Sato, Hisanobu

doi:10.1063/1.2245375

Applied Physics Letters

2006

DOI: 10.1063/1.2245375

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Magnetic properties of Sm–Fe–N thick films produced by compression shearing

Tetsuji Saito¹,

Hisanobu Sato²

Abstract: Sm-Fe-N powders were deposited onto an aluminum substrate at room temperature in ambient atmosphere by compression shearing. In contrast to other film processing techniques, a thick film was produced at an extremely high production rate of 180 m / min. The resultant thick film retained the original Sm 2 Fe 17 N 3 phase structure without any appreciable decomposition of the Sm 2 Fe 17 N 3 phase. The thick films exhibited magnetic properties matching the original Sm-Fe-N powder.

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Cited by 2 publications

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Consolidation of Nd–Fe–B melt-spun ribbon by compression shearing method

Saito

Takeishi

Nakayama

2007

Journal of Applied Physics

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Commercially available Nd–Fe–B melt-spun ribbons (MQ powders) were consolidated at temperatures ranging from room temperature to 573K in ambient atmosphere by the compression shearing method. The resultant bulk materials consisted of the Nd2Fe14B phase together with a small amount of the soft magnetic α-iron phase. The bulk material consolidated at room temperature was magnetically isotropic as was the case for the MQ powders. On the other hand, the bulk material consolidated at 573K was found to be magnetically anisotropic and showed a remanence of 9.2kG, higher than that of the MQ powders.

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Consolidation of Nd–Fe–B melt-spun ribbon by compression shearing method

Saito

Takeishi

Nakayama

2007

Journal of Applied Physics

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Recent Research Trend in Powder Process Technology for High-Performance Rare-Earth Permanent Magnets

Takagi

Hirayama

Okada

et al. 2023

KONA

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Higher performance is constantly required in rare earth permanent magnets, which are an indispensable component of the motors of electric vehicles. When producing sintered magnets, advanced structural control is necessary in the powder metallurgy process in order to achieve high performance. Especially in recent years, it has become important to develop processes for Sm-Fe-N magnets and metastable phase magnets as next-generation magnets to replace the Nd-Fe-B magnets. Because the crystal grain refinement of sintered magnets is most effective for improving coercivity, production methods for raw powders have evolved from the traditional pulverization to chemical synthesis approaches, and as a result, a submicron-sized Sm-Fe-N powder with huge coercivity has been developed. State-ofthe-art physical synthesis methods have also been applied successfully to the synthesis of nanopowders. Since control of the grain boundary is very effective in Nd-Fe-B magnets, this approach has also been evolved to Sm-Fe-N magnets by nano coating. On the other hand, since technologies for crystalline orientation control and high-density sintering are indispensable for improvement of remanence, new low-thermal load consolidation techniques such as spark plasma sintering are being developed for Sm-Fe-N magnets and metastable phase magnets in order to overcome the inherent low thermal stability of these materials.

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Magnetic properties of Sm–Fe–N thick films produced by compression shearing

Cited by 2 publications

References 16 publications

Consolidation of Nd–Fe–B melt-spun ribbon by compression shearing method

Consolidation of Nd–Fe–B melt-spun ribbon by compression shearing method

Recent Research Trend in Powder Process Technology for High-Performance Rare-Earth Permanent Magnets

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