(Sm, Zr)Fe7Nx＋α-Fe 複合磁石の組織と磁気特性

日高 徹也; 内田 信也; 山本 智実; 中村 英樹; 岩崎 信; 西澤 剛一; 福野 亮

doi:10.3379/jmsjmag.21.373

Hard Magnetic Materials

Nanostructures and Magnetic Properties of (Sm, Zr)Fe₇N_x+α-Fe Composite Magnets

T. Hidaka, N. Uchida, T. Yamamoto, H. Nakamura, M. Iwasaki, G. Nishizawa, A. Fukuno

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Keywords: rapid quenching, crystallization process, Fe₃Zr, (Sm, Zr)Fe₇, phase transformation, nanostructures, magnetic properties, nanocomposite magnets

JOURNAL OPEN ACCESS

1997 Volume 21 Issue 4_2 Pages 373-376

DOI https://doi.org/10.3379/jmsjmag.21.373

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Abstract

The dependence of the magnetic properties on the nanostructures of (Sm, Zr)Fe₇N_x+α-Fe composite magnets have been investigated. As-quenched sample consists of TbCu₇ type Sm-Fe phase (SmFe₇ phase), amorphous phase and a-Fe phase. After heat treatment at 550°C for 1 h, amorphous phase turned into SmFe₇ phase mainly. After nitrogenation, magnetic properties changed drastically with crystallization heat treatment temperature. These changes must be caused by phase transformations rather than change of nanostructures. Peak (BH)_max value could be obtained by heat treatment at 700-800°C which are higher than crystallization temperature.

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