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

doi:10.2497/jjspm.66.116

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

ENG - Materials Science

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

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 language	English
Pages (from-to)	116-121
Number of pages	6
Journal	Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume	66
Issue number	3
DOIs	https://doi.org/10.2497/jjspm.66.116
Publication status	Published - 2019 Mar

Keywords

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

ASJC Scopus subject areas

Mechanical Engineering
Industrial and Manufacturing Engineering
Metals and Alloys
Materials Chemistry

Access to Document

10.2497/jjspm.66.116

Cite this

Matsuda, R., Yarimizu, K., Matsuura, M., Tezuka, N., Sugimoto, S., Ishikawa, T., & Yoneyama, Y. (2019). Fabrication of Cr Diffused Sm ₂ Fe ₁₇ N _X Core-shell Magnetic Powders by Reduction-Diffusion Proc Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy, 66(3), 116-121. https://doi.org/10.2497/jjspm.66.116

Fabrication of Cr Diffused Sm ₂ Fe ₁₇ N _X Core-shell Magnetic Powders by Reduction-Diffusion Proc . / Matsuda, Ruka; Yarimizu, Keisuke; Matsuura, Masashi et al.

In: Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy, Vol. 66, No. 3, 03.2019, p. 116-121.

Research output: Contribution to journal › Article › peer-review

Matsuda, R, Yarimizu, K, Matsuura, M , Tezuka, N , Sugimoto, S, Ishikawa, T & Yoneyama, Y 2019, ' Fabrication of Cr Diffused Sm ₂ Fe ₁₇ N _X Core-shell Magnetic Powders by Reduction-Diffusion Proc ', Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy, vol. 66, no. 3, pp. 116-121. https://doi.org/10.2497/jjspm.66.116

Matsuda R, Yarimizu K, Matsuura M , Tezuka N , Sugimoto S, Ishikawa T et al. Fabrication of Cr Diffused Sm ₂ Fe ₁₇ N _X Core-shell Magnetic Powders by Reduction-Diffusion Proc Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy. 2019 Mar;66(3):116-121. https://doi.org/10.2497/jjspm.66.116

Matsuda, Ruka ; Yarimizu, Keisuke ; Matsuura, Masashi et al. / Fabrication of Cr Diffused Sm ₂ Fe ₁₇ N _X Core-shell Magnetic Powders by Reduction-Diffusion Proc In: Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy. 2019 ; Vol. 66, No. 3. pp. 116-121.

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

abstract = " 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. ",

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author = "Ruka Matsuda and Keisuke Yarimizu and Masashi Matsuura and Nobuki Tezuka and Satoshi Sugimoto and Takashi Ishikawa and Yukinobu Yoneyama",

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AU - Sugimoto, Satoshi

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AU - Yoneyama, Yukinobu

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N2 - 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.

AB - 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.

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KW - Reduction diffusion process

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