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2014 | 126 | 1 | 134-135
Article title

Preparation and Characterization of Fe/SiO_{2} Powder Composites Using Impregnation Method

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EN
Abstracts
EN
Fe/SiO_{2} powder composite materials based on irregularly and/or spherically shaped iron powder particles with an addition of SiO_{2} nanopowder were prepared in two ways, (i) by mixing the Fe/SiO_{2} powder with 1.0 wt.% of Shellac dissolved in ethanol and (ii) by vacuum/pressure impregnation of low-temperature sintered Fe/SiO_{2} components with shellac dissolved in ethanol and with thermoplast SL450. SiO_{2} was implemented either as nanopowder or by sol-gel coating. Vacuum/pressure impregnation (VPI) of pre-sintered samples was performed in a steel container. The influence of iron particle shape and processing conditions on the electro-insulating layer was microscopically evaluated and correlated with the values of the electrical resistivity and coercivity. It has been found that the continuity, distribution and thickness of insulating phase is strongly controlled by the shape of iron particles. Using the VPI procedure, the irregular surface of iron particles may cause discontinuities of insulating layer, while the spherical iron particles are well covered with continuous evenly distributed insulating layer.
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Contributors
author
  • Institute of Materials Research SAS, Watsonova 47, 040 01 Košice, Slovakia
author
  • Institute of Physics, Faculty of Sciences, P.J. Šafárik University, Park Angelinum 9, 041 54 Košice, Slovakia
author
  • Technical University Košice, Letná 9, 040 01 Košice, Slovakia
author
  • Institute of Materials Research SAS, Watsonova 47, 040 01 Košice, Slovakia
author
  • Institute of Physics, Faculty of Sciences, P.J. Šafárik University, Park Angelinum 9, 041 54 Košice, Slovakia
References
  • [1] K. Narasimhan, F. Hanejko, M.L. Marucci, PM World Congress, Washington D.C. 2008
  • [2] K. Narasimhan, M.L. Marucci, EuroPM2003 207, EPMA (2003)
  • [3] Somaloy® Technology for Power Electronics, Höganäs AB, Sweden, (2011)
  • [4] A.H. Taghvaei, A. Ebrahimi, M. Ghaffari, K. Janghorban, J. Magn. Magn. Mater 322, 808 (2010), doi: 10.1016/j.jmmm.2009.11.008
  • [5] E. Thirumal, D. Prabhu, K. Chattopadhyay, V. Chandran, J. Alloys Compd. 502, 169 (2010), doi: 10.1016/j.jallcom.2010.04.135
  • [6] F. Mazaleyrat, M. Ammar, M. LoBue, J.-P. Bonnet, P. Audebert, G.Y.Wang, Y. Champion, M. Hytch, E. Snoeck, J. Alloys Compd. 483, 473 (2009), doi: 10.1016/j.jallcom.2008.08.121
  • [7] L.J. van der Pauw, Philips Technical Review 20, 220 (1958/59)
Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv126n1063kz
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