Enhancing Magnetic Properties of Bulk Nanograin Composite Nd-Fe-B/Pe-Co Magnets by Applying Powder Coating Technologies

摘要

Recently, bulk nanograin Nd-Fe-B/α-Fe and Nd-Fe-B/Fe-Co composite magnets were synthesized via hot compaction of a mixture of a melt-spun Nd-Fe-B powder and a α-Fe or Fe-Co powder, followed by die upsetting. The magnetically soft phase in these magnets is quite large - up to 40 micrometers [1]. It is obvious that if the soft phase can be significantly reduced in size and highly dispersed throughout the magnet, then the interaction between the soft and hard phases will be enhanced and, thus, magnetic performance of the composite magnets can be further improved.