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

Volume

39

Issue

5

fYear

2003

Firstpage

2971

Lastpage

2973

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;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2003.816710

Filename

1233276