How Extrinsic Is the Coercivity in NdFeB Bonded Magnets?

Author

Perigo, E.A. ; Cruz, I.A. ; Antunes, B. ; Braga, A.P.V. ; Landgraf, Fernando J. G.

Author_Institution

Lab. for the Phys. of Adv. Mater., Univ. of Luxembourg, Luxembourg, Luxembourg

Volume

49

Issue

9

fYear

2013

fDate

Sept. 2013

Firstpage

5043

Lastpage

5047

Abstract

The influence of the densification step, performed by uniaxial pressing at room temperature, on the coercivity μ₀H_c of NdFeB bonded magnets has been analyzed. The mass density does not play any role on μ₀H_c of non-cured magnets prepared by the mentioned method. Due to the brittle and intergranular character of the Nd₂Fe₁₄B-based phase fracture, the nano-sized grains are not affected or the modification is negligible, which maintains μ₀H_c unchanged. After curing, the intrinsic coercivity of the magnets is reduced as a function of the compaction pressure increase.

Keywords

coercive force; compaction; magnetic materials; NdFeB; bonded magnets; compaction pressure; intergranular character; intrinsic coercivity; mass density; nanosized grains; phase fracture; temperature 293 K to 298 K; uniaxial pressing; Coercive force; Compaction; Curing; Magnetic hysteresis; Magnetometers; Powders; Soft magnetic materials; Coercivity; NdFeB; magnetic materials; pressing;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2013.2253788

Filename

6484981