Publication Type
Journal
Journal Name
IEEE Transactions on Magnetics
Publication Date
Volume
TBD
Issue
TBD
Abstract
High coercivity and anisotropic Nd-Fe-B powders for making anisotropic bonded magnets have been prepared by hydrogenation-disproportionation-desorption-recombination (HDDR). We found that the processing hydrogen pressure is intimately correlated to the formation of c-axis crystal texture of Nd2Fe14B phase. There exists a critical hydrogen pressure, Pcrit, during Hydrogen-Disproportionation stage, that promotes the formation of c-axis crystal texture. When processing hydrogen pressure is higher than Pcrit, the formation of c-axis texture deteriorates and results in isotropic Nd-Fe-B magnetic powders. The existence of Pcrit is ascribed to the thermodynamics and kinetics origin during HDDR process.
