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

Autor(es)

Perigo, E. A. ^[1] ; da Silva, S. C. ^[2] ; Martin, R. V. ^[1] ; Takiishi, H. ^[2] ; Landgraf, F. J. G. ^[1]

Afiliação do(s) autor(es)

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

^[2] Nucl & Energy Res Inst, BR-05508000 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Applied Physics; v. 111, n. 7 APR 1 2012.
• Citações Web of Science: 25

Resumo

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)

• Processo FAPESP: 10/08018-8 - Reprocessamento de ímãs sinterizados comerciais de TRFeB para a preparação de magnetos aglomerados e de compostos magnéticos semiduros utilizando hidrogênio
• Beneficiário: Élio Alberto Périgo
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado