TY - JOUR
T1 - Fabrication of Cr Diffused Sm 2 Fe 17 N X Core-shell Magnetic Powders by Reduction-Diffusion Proc
AU - Matsuda, Ruka
AU - Yarimizu, Keisuke
AU - Matsuura, Masashi
AU - Tezuka, Nobuki
AU - Sugimoto, Satoshi
AU - Ishikawa, Takashi
AU - Yoneyama, Yukinobu
N1 - Publisher Copyright:
© 2019 Japan Society of Powder and Powder Metallurgy.
PY - 2019/3
Y1 - 2019/3
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.
KW - Core-shell structure
KW - Magnetic properties
KW - Reduction diffusion process
KW - Sm-Fe-N powder
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U2 - 10.2497/jjspm.66.116
DO - 10.2497/jjspm.66.116
M3 - Article
AN - SCOPUS:85064120873
VL - 66
SP - 116
EP - 121
JO - Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
JF - Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
SN - 0532-8799
IS - 3
ER -