The effect of Ga addition on the increase of coercivity of HDDR-treated Nd-Fe-B powders was investigated. The Ga addition suppresses grain growth and may decrease the region where magnetocrystalline anisotropy is reduced. In addition, a heat treatment in which the hydrogen pressure was decreased in steps during the recombination reaction resulted in good magnetic properties of Br = 1.44T, jHc = 0.97MA m-1 and (BH)max = 308 kJm-3.
- Ga addition
- Hydrogen pressure
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics