Title :
Effects of Nb addition on structural and magnetic properties of Fe-B/Nd2Fe14B-based nanocomposite magnets
Author :
Miyoshi, Toshio ; Kanekiyo, Hirokazu ; Hirosawa, Satoshi
Author_Institution :
Res. & Dev. Div., Neomax Co. Ltd, Osaka, Japan
Abstract :
Effects of Nb addition on Ti-doped Nd-poor and B-rich composition are investigated. It is found that Nb addition improves the glass-forming ability of rapidly solidified Nd-Fe-B-Ti-based alloys, resulting in significant improvements of magnetic properties in a low cooling-rate regime. Moreover, magnetic properties of the alloys prepared by various surface speeds of Cu wheel, Vs, were almost constant at an excellent level. As a result of transmission electron microscope observation, microstructure was relatively identical and fine regardless of Vs. Therefore, Nb addition is effective to obtain the high performance of magnetic properties within a wide range of cooling rates.
Keywords :
boron alloys; cooling; crystal microstructure; doping; ferromagnetic materials; iron alloys; nanocomposites; neodymium alloys; permanent magnets; surface magnetism; titanium alloys; Cu; NdFeB:Ti; cooling rate; magnetic properties; microstructure; nanocomposite magnets; structural properties; transmission electron microscope; Cooling; Iron alloys; Magnetic properties; Magnets; Neodymium; Niobium alloys; Powders; Temperature; Transmission electron microscopy; Wheels; Bonded magnets; Nb addition; permanent magnets; rapid solidification;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2005.854949
