Advanced search
Start date
Betweenand
Related content
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Properties of hydrogenation-disproportionation-desorption-recombination NdFeB powders prepared from recycled sintered magnets

Full text
Author(s):
Perigo, E. A. [1] ; da Silva, S. C. [2] ; Martin, R. V. [1] ; Takiishi, H. [2] ; Landgraf, F. J. G. [1]
Total Authors: 5
Affiliation:
[1] Inst Technol Res, BR-05508901 Sao Paulo - Brazil
[2] Nucl & Energy Res Inst, BR-05508000 Sao Paulo - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Journal of Applied Physics; v. 111, n. 7 APR 1 2012.
Web of Science Citations: 25
Abstract

The effects of the hydrogenation-disproportionation-desorption-recombination (HDDR) processing conditions on the microstructure and magnetic properties of NdFeB powders prepared from recycling sintered N42 grade magnets were evaluated. Temperatures below 840 degrees C and above 900 degrees C are deleterious to HDDR powders' properties. The hydrogen pressure, ranging from 60 to 135 kPa, has a major influence on the remanence compared to that on the intrinsic coercivity. The best magnetic properties (J(r) = 0.58 T and H-mu 0(c) = 15 T) were obtained with T-recomb = 860 degrees C, P-H2 = 135 kPa, and t(recomb) = 330 s. Such coercivity value corresponds to 93% of the starting material, not achieved yet by optimizing the HDDR process and without using Dy. (C) 2012 American Institute of Physics. {[}doi: 10.1063/1.3677761] (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