Coercivity enhancement of Ce-Fe-B sintered magnets by low-melting point intergranular additive

Ce-Fe-B sintered magnets with enhanced coercivity were prepared by the powder metallurgy method. The mechanism of the coercivity enhancement in Ce-Fe-B sintered magnets with the low-melting point intergranular additive was discussed in details. It was speculated that the low coercivity of Ce-Fe-B si...

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Published inJournal of rare earths Vol. 35; no. 2; pp. 158 - 163
Main Author 陈侃 郭帅 范晓东 丁广飞 陈岭 陈仁杰 李东 闫阿儒
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.02.2017
Subjects
Ce-Fe-B
intergranular additive
microstructure
rare earths
Ce-Fe-B
microstructure
intergranular additive
rare earths
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Summary:Ce-Fe-B sintered magnets with enhanced coercivity were prepared by the powder metallurgy method. The mechanism of the coercivity enhancement in Ce-Fe-B sintered magnets with the low-melting point intergranular additive was discussed in details. It was speculated that the low coercivity of Ce-Fe-B sintered magnet was related to the irregular sharps and relatively low magneto-anisotropy field of the matrix phase. After introducing a 20 wt.% Nd-based intergranular additive, the coercivity markedly increased from 108 Oe to 2560 Oe due to the formation of thin and continuous grain boundary layers and the surface modification of the matrix phase grains. Additionally, the formation of the high anisotropy field（Nd,Ce）_2Fe_（14）B shell was beneficial to the increase of the coercivity as well. This work suggested that adding low-melting point intergranular additives was effective to fabricate the practical Ce-Fe-B sintered magnets.
Bibliography:Ce-Fe-B microstructure intergranular additive rare earths
11-2788/TF
Ce-Fe-B sintered magnets with enhanced coercivity were prepared by the powder metallurgy method. The mechanism of the coercivity enhancement in Ce-Fe-B sintered magnets with the low-melting point intergranular additive was discussed in details. It was speculated that the low coercivity of Ce-Fe-B sintered magnet was related to the irregular sharps and relatively low magneto-anisotropy field of the matrix phase. After introducing a 20 wt.% Nd-based intergranular additive, the coercivity markedly increased from 108 Oe to 2560 Oe due to the formation of thin and continuous grain boundary layers and the surface modification of the matrix phase grains. Additionally, the formation of the high anisotropy field（Nd,Ce）_2Fe_（14）B shell was beneficial to the increase of the coercivity as well. This work suggested that adding low-melting point intergranular additives was effective to fabricate the practical Ce-Fe-B sintered magnets.
CHEN Kan 1,2, GUO Shuai1,2, FAN Xiaodong 1,3, DING Guangfei 1,2, CHEN Ling 1, CHEN Renjie1,2, LEE Don 1,2, YAN Aru1,2 （1. Key Lab of Magnetic Materials and Devices, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China; 3. School of Material Science and Engineering, Xi＇an University of Technology, Xi＇an 710000, China）
ISSN:1002-0721
2509-4963
DOI:10.1016/S1002-0721(17)60894-9