Dry and wet milling comparison of Nd-Fe-B magnets based on strip cast alloys
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In this work, the influence of milling medium was investigated in order to achieve high
energy-product Nd-Fe-B magnets, mostly by the remanence improvement related to the obtention of
monocrystalline particles during milling. Nd-Fe-B alloy made by strip-casting process were used as
starting material, which exhibits refined grain structure and demands special attention during
milling in relation to coarse-grained, conventionally cast alloys. It was found that by using liquid
medium during ball milling process, the mean particle size decreased, as well as the size
distribution, which improved the particle alignment and hence the remanence in the sintered
magnet. Texture was quantified by magnetic characterization based on reference isotropic magnets
made in same conditions, and microstructure development was evaluated by optical microscopy.
Moreover, after post-sintering treatment, the coercivity increased 20% compared to as sintered state
without changing the remanence, providing an anisotropic magnet with high coercivity.
Como referenciar
MACCARI, F.; WELL, R.V.; ELLER, G.; HOFFMANN, M.S.T.; LOPES, L.U.; TAKIISHI, H.; WENDHAUSEN, P.A.P. Dry and wet milling comparison of Nd-Fe-B magnets based on strip cast alloys. Materials Science Forum, v. 899, p. 567-571, 2017. DOI: 10.4028/www.scientific.net/MSF.899.567. Disponível em: http://repositorio.ipen.br/handle/123456789/28491. Acesso em: 29 Apr 2026.
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