Open AccessStructure and properties of sintered MM–Fe–B magnets
Author(s) -
R. X. Shang,
J. F. Xiong,
R. Li,
Wenlong Zuo,
Jie Zhang,
Tong Zhao,
R. J. Chen,
Jirong Sun,
Bao-gen Shen
Publication year - 2017
Publication title -
aip advances
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.421
H-Index - 58
ISSN - 2158-3226
DOI - 10.1063/1.4973603
Subject(s) - sintering , magnet , tempering , materials science , curie temperature , metallurgy , grain size , phase (matter) , analytical chemistry (journal) , composite material , nuclear magnetic resonance , ferromagnetism , condensed matter physics , electrical engineering , chemistry , chromatography , physics , organic chemistry , engineering
MM14Fe79.9B6.1 magnets were prepared by conventional sintering method. The Curie temperature of the sintered MM2Fe14B magnet was about 210 °C. When the sintering temperature increased from 1010 °C to 1030 °C, the density of the magnet increased from 6.85 g/cm3 to 7.52 g/cm3. After the first stage tempering at 900 °C, the (BH)max and Hcj had a slight increase. The maximum value of (BH)max = 7.6 MGOe and Hcj = 1080 Oe was obtained when sintered at 1010 °C and tempering at 900 °C, respectively. The grain size grew very large when the sintering temperature increased to 1050 °C, and the magnetic properties deteriorated rapidly. La reduced by ∼ 7.5 at. % in grains, which is almost equal to the increased percentage of Nd. That is mainly because La-Fe-B is very difficult to form the 2: 14: 1 phase
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