Title :
Development of improved powder for bonded permanent magnets
Author :
Kramer, M.J. ; Xu, Y. ; Dennis, K.W. ; Anderson, I.E. ; McCallum, R.W.
Author_Institution :
Ames Lab., Iowa State Univ., Ames, IA, USA
Abstract :
Modified high-pressure gas atomization (HPGA) produces spherical, rapidly solidified powder, which is more suitable for bonded magnet processing. He atomization produced powder in the diameter <45 μm size that has a glassy fraction comparable to melt-spun ribbon quenched from about 16 m/s. Differences in magnetic properties are attributed to differences in solidification microstructures.
Keywords :
X-ray diffraction; boron alloys; differential thermal analysis; ferromagnetic materials; fluidised beds; iron alloys; magnetisation; melt spinning; neodymium alloys; permanent magnets; powder metallurgy; rapid solidification; DTA; He atomization; Nd-Fe-B; Nd-Fe-B alloys; NdFeB-TiC; XRD; bonded magnet processing; bonded permanent magnets; fluidized bed fluorination; gas phase reaction coating process; glassy fraction; magnetic properties; melt-spun ribbon; modified high-pressure gas atomization; quench rates; solidification microstructures; spherical rapidly solidified powder; Bonding; Coatings; Helium; Iron alloys; Magnetic properties; Microstructure; Neodymium; Permanent magnets; Powders; Spinning;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2003.816710
