Phase composition and magnetic characteristics of inert gas-atomized RE-Fe-B-based powders

Author

Lewis, L. Henderson ; Sellers, C.H. ; Panchanathan, V.

Author_Institution

Div. of Mater. Sci., Brookhaven Nat. Lab., Upton, NY, USA

Volume

31

Issue

6

fYear

1995

fDate

11/1/1995 12:00:00 AM

Firstpage

3641

Lastpage

3643

Abstract

Microstructure, phase constitution and temperature-dependent magnetic properties are examined for two size fractions of as-quenched RE-Nd-B-based powder produced by inert gas atomization for possible use as isotropic bonded magnet precursors. The atomized powders consist of the phase (Nd,Dy)₂Fe₁₄B with minute amounts of RE ₂O₃ and γ-Fe₂O₃. Evidence of compositional segregation with particle size is seen. Room-temperature magnetic properties are H_ci=12 kOe and B_R=5.4 kG for the 10-20 μm portion, H_ci=1.8 kOe and B_R=3 kG for the 100-150 μm portion

Keywords

boron alloys; crystal microstructure; dysprosium alloys; ferromagnetic materials; magnetic particles; neodymium alloys; permanent magnets; segregation; stoichiometry; (Nd,Dy)₂Fe₁₄B; (NdDy)₂Fe₁₄B; 10 to 20 mum; 100 to 150 mum; 300 K; compositional segregation; inert gas atomization; microstructure; phase composition; powders; temperature-dependent magnetic properties; Bonding; Helium; Laboratories; Magnetic field measurement; Magnetic properties; Materials science and technology; Microstructure; Powders; Saturation magnetization; Scanning electron microscopy;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.489595

Filename

489595