How Extrinsic Is the Coercivity in NdFeB Bonded Magnets?

Author(s)

Perigo, E. A. ^{[1, 2]} ; Cruz, I. A. ^[1] ; Antunes, B. ^[1] ; Braga, A. P. V. ^{[3, 1]} ; Landgraf, F. J. G. ^{[3, 1]}

Affiliation

^[1] Inst Technol Res, BR-05508901 Sao Paulo - Brazil

^[2] Univ Luxembourg, Lab Phys Adv Mat, L-1511 Luxembourg - Luxembourg

^[3] Univ Sao Paulo, Polytech Sch, BR-05508010 Sao Paulo - Brazil

• Document type: Journal article
• Source: IEEE Transactions on Magnetics; v. 49, n. 9, p. 5043-5047, SEP 2013.
• Web of Science Citations: 3

Abstract

The influence of the densification step, performed by uniaxial pressing at room temperature, on the coercivity mu H-0(c) of NdFeB bonded magnets has been analyzed. The mass density does not play any role on mu H-0(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 mu H-0(c) unchanged. After curing, the intrinsic coercivity of the magnets is reduced as a function of the compaction pressure increase. (AU)

• FAPESP's process: 10/08018-8 - Reprocessing of commercial REFeB (RE = Nd or Pr) sintered magnets for preparation of bonded magnets and semi-hard magnetic compounds using hydrogen
• Grantee: Élio Alberto Périgo
• Support Opportunities: Scholarships in Brazil - Post-Doctoral