Abstract
Commercial N50 sintered Nd–Fe–B magnets were grain boundary diffusion (GBD) processed with TbHx powders. The diffusion temperature and time dependent microstructure and magnetic properties of the GBD processed magnets were investigated. High remanence and coercivity were obtained when the magnet was GBD processed at 875 °C for 14 h; the coercivity of the magnet increased from 12.57 kOe to 22.65 kOe. The relationships between microstructure and coercivity, remanence, and thermal stability of the GBD processed magnets were analyzed and discussed.
Highlights
Sintered Nd–Fe–B magnets with high coercivity (Hcj) are a key material in high-efficiency motors for electric vehicles and wind generators and high temperature electrical appliances
This indicates that high remanence and coercivity can be obtained when the magnet is grain boundary diffusion (GBD) processed at 875 ○C for 10 h
Since the remanence deviation of the magnets GBD processed at 875 ○C for 14 h is smaller than that of magnets processed at 900 ○C for 8 h, the variation curve of remanence coefficients with temperature is smoother
Summary
Sintered Nd–Fe–B magnets with high coercivity (Hcj) are a key material in high-efficiency motors for electric vehicles and wind generators and high temperature electrical appliances. The microstructure and magnetic properties of the magnet with different GBD processing temperatures (T) and times (t) were investigated. When GBD processed at 975 ○C for 12 h, high remanence and the maximum energy product of the magnet are 14.40 kGs and 51.2 MGOe, respectively.
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