Effect of heat treatment in magnetic properties and microstructure of NdFeB-based permanent magnets produced by strip casting alloys
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2022
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CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 24.
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Nd14FebalB6 sintered magnets were produced from a strip casting (SC) alloy, obtained in a pilot
scale. The SC alloy was submitted to heat treatments (HT) of 2.5 h and 5 h at 1373 K under vacuum
atmosphere and then processed by the powder metallurgy route to obtain the magnets. The SC
alloys with and without HT were fragilized in hydrogen (H2), milled and, the powders resultants
were aligned in a 6 T pulsed field, compacted in isostatic press at 200 MPa and vacuum sintered at
1373 K during 1 h. The X-ray diffraction results showed the presence of magnetic 2:14:1 phase and
Fe in the SC alloy without the HT. After the HT of 2,5 h and 5 h, only the phase 2:14:1 was observed,
indicating that the HT was sufficient to homogenize the alloy. The microstructural analysis of the
alloy after 5 h of HT by electronic scanning microscopy showed the presence of 2:14:1 phase,
confirming the XRD results and the Nd-rich phase, as well as the increase in grain size with
increasing of the heat treatment time. The increase in grain size of the alloys after the heat
treatment resulted in sintered magnets with larger grains than the magnet obtained from the alloy
without the heat treatment. The highest magnetic properties among all samples were obtained in
magnet produced from the alloy submitted to heat treatment during 5 h, which exhibited the
following values of iHc = 462 kAm-1 and Jr = 1.27 T.
Como referenciar
FARIA, M.E.; JANASI, S.R.; SILVA, S.C.; SILVA FILHO, J.C.; MARTINEZ, L.G. Effect of heat treatment in magnetic properties and microstructure of NdFeB-based permanent magnets produced by strip casting alloys. In: CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 24., 6-10 de novembro, 2022, Águas de Lindóia, SP. Resumo... Disponível em: http://repositorio.ipen.br/handle/123456789/33753. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.