Title :
Magnetic properties of nd-fe-b HDDR thin hot pressed magnet
Author :
Mori, K. ; Nakayama, R. ; Morimoto, K.
Author_Institution :
Central Res. Inst., Mitsubishi Mater. Corp., Saitama, Japan
Abstract :
Fully dense magnets prepared by hot pressing of the hydrogenation-decomposition-desorption-recombination (HDDR)-processed powders have very fine microstructures. We investigated the magnetic properties and the surface morphology of the machined HDDR thin hot pressed magnets. In the performance of the machined thin hot pressed magnets, it is hard to get the influence of thickness and almost not get the influence of damage by surface roughness. The long-term stabilities were investigated and the total irreversible flux loss of a high coercivity hot pressed magnet at 423 K was -1.3% after 1000 h. The HDDR hot pressed magnets make it possible to stabilize the magnetic properties of thin Nd-Fe-B magnets.
Keywords :
boron alloys; coercive force; crystal microstructure; hot pressing; iron alloys; magnetic particles; magnetic thin films; neodymium alloys; permanent magnets; surface magnetism; surface roughness; HDDR processed powders; NdFeB; coercivity; decomposition; desorption; hot pressing; hydrogenation; magnetic properties; microstructures; recombination; surface morphology; surface roughness; thin hot pressed magnets; Magnetic flux; Magnetic properties; Metalworking machines; Microstructure; Powders; Pressing; Rough surfaces; Stability; Surface morphology; Surface roughness; Hot pressed magnet; Nd–Fe–B magnet; hydrogenation-decomposition-desorption-recombination (HDDR) powder; thin magnet;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2005.854699
