Fabrication of Cr Diffused Sm 2 Fe 17 N X Core-shell Magnetic Powders by Reduction-Diffusion Proc

Ruka Matsuda, Keisuke Yarimizu, Masashi Matsuura, Nobuki Tezuka, Satoshi Sugimoto, Takashi Ishikawa, Yukinobu Yoneyama

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5 Citations (Scopus)


In this work, Cr diffused Sm 2 Fe 17 N X core-shell magnetic powders were prepared by reduction-diffusion (RD) process. Sm 2 Fe 17 coarse, Cr 2 O 3 and Sm 2 O 3 fne powders were pulverized and mixed by ball milling, and the mixed powder was heat treated following Ca addition. Cr can diffuse into Sm 2 Fe 17 powder above 875°C in RD process, and the diffusion distance of Cr increased with increase in RD temperature. Cr diffusion distance into Sm 2 Fe 17 powder was about 1.1-1.2 μm under RD temperature at 875°C for 1.5 h, and the Cr-diffused Sm-Fe core-shell fne powder was obtained. After nitriding and washing, Cr-diffused Sm-Fe-N fne core-shell powder was successfully obtained, and the coercivity and saturation magnetization of the core-shell powder was 855 kA·m -1 and 122 Am 2 ·kg -1 , respectively. The saturation magnetization was higher than non-core-shell Sm-Fe-Cr-N powder.

Original languageEnglish
Pages (from-to)116-121
Number of pages6
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Issue number3
Publication statusPublished - 2019 Mar


  • Core-shell structure
  • Magnetic properties
  • Reduction diffusion process
  • Sm-Fe-N powder


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