Studies on low rare earth Nd-Fe-B compositions

Author

Panchanathan, V.

Author_Institution

Delphi Energy & Engine Manage. Syst., Gen. Motors Corp., Anderson, IN, USA

Volume

31

Issue

6

fYear

1995

fDate

11/1/1995 12:00:00 AM

Firstpage

3605

Lastpage

3607

Abstract

Investigations have been carried out to evaluate the optimum Nd-Fe-B composition to have H_ci of at least 4 kOe. The optimum composition for the best magnetic properties is as follows: TRE 18 wt.%, B 1 wt.% and balance Fe. The magnetic properties are B_r, 10.1 kG, H_ci 4.3 kOe and BH_max 12.5 MGOe. All the additives (Ga, Nb, Mo, V, Cr) with or without cobalt addition did not improve the magnetic properties. The bonded magnets made using this material had B_r value slightly higher than the standard MQP-B powder. The low coercivity of these materials limit their operating temperature to 80°C. This material having Nd₂Fe ₁₄B/∝-Fe shows improved saturation behavior compared to those having Nd₂Fe₁₄B/Fe₃B and Nd₂Fe₁₄B structures. It would then be a good candidate for applications where magnetization is difficult

Keywords

alloying additions; boron alloys; chromium alloys; cobalt alloys; coercive force; ferromagnetic materials; gallium alloys; iron alloys; magnetic permeability; molybdenum alloys; neodymium alloys; niobium alloys; permanent magnets; remanence; vanadium alloys; 80 C; Co addition; Cr; Ga; Mo; Nb; NdFeBCo; NdFeBCr; NdFeBGa; NdFeBMo; NdFeBNb; NdFeBV; V; additives; bonded magnets; low coercivity; low rare earth Nd-Fe-B compositions; magnetic properties; magnetization; optimum Nd-Fe-B composition; saturation behavior; Additives; Bonding; Chromium; Cobalt; Iron; Magnetic materials; Magnetic properties; Magnets; Neodymium; Niobium;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.489583

Filename

489583