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Interface reaction between oxide glasses and Fe-Al-Si magnetic alloy

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Abstract

The interface reactions between oxide glasses and magnetic alloy, Fe-Al-Si (so-called Sendust), were analysed. The oxide glasses used were SiO2-PbO, SiO2-Na2O, SiO2-Li2O and B2O3-Na2O binary glasses. It was observed that the lattice constant of the alloy decreases and the saturation magnetic-flux density of the alloy increases on reaction with the glasses. It was found that the aluminium atoms in the alloy diffuse to the interface and dissolve into the glass melt as Al3+ ions, leading to the iron-rich composition of the alloy. On the other hand, Pb2+, Na+ and H+ ions in the molten glasses were reduced at the interface. Metallic lead particles about 20 Μm in diameter were found to be dispersed in the SiO2-PbO melt. Reduced sodium was thought to evaporate from the SiO2-Na2O melt, and H2 gas bubbles were observed at the interface between B2O3-Na2O melt and the alloy. These reactions were analysed based on the standard free energy diagrams of oxidation-reduction reaction, and expressed as 3Pb 2+glass +2Alalloy → 3Pb+2Al 3+glass 3Na +glass +Alalloy → 3Na+Al 3+glass 6H +glass +2Alalloy → 3H2+2Al 3+glass

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Author notes

  1. K. Matusita

    Present address: Research and Development Centre, Toshiba Corporation, 4-1 Ukishimacho, Kawasaki-ku, Kawasaki, 210, Kanagawa-ken, Japan

Authors and Affiliations

  1. Department of Chemistry, Nagaoka University of Technology, 1603-1 Kamitomiokacho, Nagaoka, 940-21, Niigata-ken, Japan

    K. Matusita, M. Satou, T. Komatsu & T. Nakahara

  2. Alps Electric Co. Ltd, 1-3-5 Higashi-Takami, Nagaoka, 940, Niigata-ken, Japan

    A. Nitta

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  1. K. Matusita
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  4. T. Nakahara
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Matusita, K., Satou, M., Komatsu, T. et al. Interface reaction between oxide glasses and Fe-Al-Si magnetic alloy. J Mater Sci 28, 6333–6339 (1993). https://doi.org/10.1007/BF01352193

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  • DOI: https://doi.org/10.1007/BF01352193

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