Proceedings of the Korean Powder Metallurgy Institute Conference (한국분말야금학회:학술대회논문집)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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[ $Sm_2Fe_{17}$ ] Prepared by Calciothermic Reduction-Diffusion Using Different Iron Powders

  • Boareto, J.C. (Universidade Federal de Santa Catarina, Centro Tecnologico - CTC, Laboratorio de Materiais-LABMAT) ;
  • Soyama, J. (Universidade Federal de Santa Catarina, Centro Tecnologico - CTC, Laboratorio de Materiais-LABMAT) ;
  • Felisberto, M.D.V. (Universidade Federal de Santa Catarina, Centro Tecnologico - CTC, Laboratorio de Materiais-LABMAT) ;
  • Hesse, R. (Universidade Federal de Santa Catarina, Centro Tecnologico - CTC, Laboratorio de Materiais-LABMAT) ;
  • Pinto, A.V.A. (Universidade Federal de Santa Catarina, Centro Tecnologico - CTC, Laboratorio de Materiais-LABMAT) ;
  • Taylor, T.R. (Universidade Federal de Santa Catarina, Centro Tecnologico - CTC, Laboratorio de Materiais-LABMAT) ;
  • Wendhausen, P.A.P. (Universidade Federal de Santa Catarina, Centro Tecnologico - CTC, Laboratorio de Materiais-LABMAT)
  • Published : 2006.09.24
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Abstract

This paper compares the effect of using different types of iron powders for the preparation of $Sm_2Fe_{17}$ by calciothermic reduction-diffusion (CRD). Three types of iron powder were used: carbonyl, sponge and water atomized. The results show that, when immediately nitrogenated after the CRD process, $Sm_2Fe_{17}$ prepared from sponge and water atomized iron powders yield $Sm_2Fe_{17}N_3$-magnets with a high degree of texture. However, after a suitable treatment with hydrogen followed by nitrogenation, $Sm_2Fe_{17}$-powders made from Carbonyl iron produce magnets with the best quality regarding coercivity, remanence and degree of texture.

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