The effects of the pressing step on the microstructure and aging of NdFeB bonded magnets
| Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
|---|---|
| Data(s) |
15/10/2013
15/10/2013
2012
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| Resumo |
The effects of the compaction step on the (micro)structural features and aging behavior of polymer coated NdFeB-based bonded magnets is reported. Due to the fracture of the material during pressing, it is estimated an increase of at least 14% in the particles' area which is not coated. Such uncoated surfaces, when exposed to the environment, reduce the magnetic performance of the magnets aged/cured in air by 19% in the conditions evaluated in this investigation. Furthermore, XRD results interpreted by Rietveld analyses show a lattice parameter change in the tetragonal structure of the hard magnetic phase after pressing. Such change varies as a function of the height of the compacted part and it is ascribed to macro-elastic stress arising from the pressure distribution in the magnet. An aging/curing step during 24 h is able to relief such macro-elastic stress. (C) 2012 Elsevier B.V. All rights reserved. FAPESP FAPESP [proc. 2010/08018-8] |
| Identificador |
POWDER TECHNOLOGY, v. 224, n. 1, pp. 291-296, JUL, 2012 0032-5910 http://www.producao.usp.br/handle/BDPI/35110 10.1016/j.powtec.2012.03.010 |
| Idioma(s) |
eng |
| Publicador |
ELSEVIER SCIENCE SA LAUSANNE |
| Relação |
POWDER TECHNOLOGY |
| Direitos |
closedAccess Copyright ELSEVIER SCIENCE SA |
| Palavras-Chave | #NDFEB #AGING #MAGNETIC PROPERTIES #RIETVELD ANALYSIS #ND #TEMPERATURE #RE #ENGINEERING, CHEMICAL |
| Tipo |
article original article publishedVersion |
