Unique high-temperature performance of highly condensed MnBi permanent magnets
Journal
Scripta Materialia
Journal Volume
107
Date Issued
2015-10-01
Author(s)
Chen, Yu Chun
Gregori, Giuliano
Leineweber, Andreas
Qu, Fei
Tietze, Thomas
Kronmüller, Helmut
Schütz, Gisela
Goering, Eberhard
Abstract
High-performance MnBi isotropic magnets have been prepared via spark-plasma-sintering, which achieves bulk magnets with high densification and little grain growth. The sintered magnets in this work show high saturation magnetization at high temperatures. Moreover, hard magnetic behavior is still present after heating beyond its phase transition temperature. The exceptional thermal stability could be due to the observed fine-grained microstructure. The analysis of temperature dependence of coercivity behavior demonstrates that the magnetization process can be explained by nucleation model.
Subjects
MnBi | Rare-earth-free permanent magnet | SPS | Thermal stability
Type
journal article