ホーム > 研究活動 > 2014年 > High-coercivity hot-deformed Nd–Fe–B permanent magnets processed by Nd–Cu eutectic diffusion under expansion constraint

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High-coercivity hot-deformed Nd–Fe–B permanent magnets processed by Nd–Cu eutectic diffusion under expansion constraint

Scripta Materialia 81 (2014) 48–51

2014年4月16日(水)

Scripta Materialia 81 (2014) 48–51
T. Akiya ( NIMS )
J. Liu, K. Hono ( NIMS, Tsukuba Univ. )
H. Sepehri-Amin, T. Ohkubo ( NIMS )
K. Hioki, A. Hattori ( Daido Steel Co. Ltd )

Abstract

The application of expansion constraint during the grain-boundary diffusion process using Nd70Cu30 eutectic alloy minimizes the remanence loss for the coercivity enhancement by optimizing the volume fraction of the Nd(Cu)-rich non-ferromagnetic intergranular layer. The diffusion-processed sample exhibits l0Hc  2 T, l0Mr = 1.36 T and (BH)max = 358 kJ m3 at room temperature. Because of the low-temperature coefficient of coercivity, the magnet showed (BH)max  191 kJ m3 at 200 C, which is superior to that of Dy-containing high-coercivity sintered magnets.

Available online

7 March 2014

Acknowledgement

This work was supported by Japan Science and Technology Agency, CREST.


研究活動

文部科学省

文部科学省HP
文部科学省HP(元素戦略プロジェクト)

元素戦略拠点

触媒・電池元素戦略拠点
触媒・電池元素戦略研究拠点 (京都大学)
東工大元素戦略拠点
東工大元素戦略拠点 (東京工業大学)
構造材料元素戦略研究拠点
構造材料元素戦略研究拠点 (京都大学)
高効率モーター用磁性材料技術研究組合
高効率モーター用 磁性材料技術研究組合