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The investigation was carried out on nanocomposite Nd10Fe84-xWxB6 magnets with different tungsten content (from 0 to 33 at.%) produced by the mechanical alloying method. The alloys have a fine grained and highly porous structure. As tungsten is added the powder particles become progressively smaller and are distributed uniformly throughout the whole specimen volume. From the phase structure determination using X-ray diffraction, Moessbauer spectroscopy and transmission electron microscopy it has been found that with the increase of tungsten content in the magnets the amount of the magnetically hard Nd2Fe14B and the soft alpha-Fe phases decrease. Instead, paramagnetic phases appear. Moreover, the addition of tungsten to the basic composition results in a significant increase in coercivity jHc (from 260 to 1350 kA/m) and a reduction in both the remanence Br (from 0.95 to 0.24 T) and the maximum magnetic energy product (BH)max (from 80 to 13 kJ/cubic m).
Wydawca
Czasopismo
Rocznik
Tom
Strony
85--99
Opis fizyczny
Bibliogr. 14 poz., rys., tab.
Twórcy
autor
autor
autor
autor
autor
- Institute of Physics, Faculty of Materials Processing Technology and Applied Physics, Częstochowa University of Technology, Al. Armii Krajowej 19, 42-200 Częstochowa, Poland
Bibliografia
- [1] W. Rodewald, P. Schrey, J. Magn. Magn. Mater., 83, 206 (1990).
- [2] M. Leonowicz, Nowoczesne materiały magnetycznie twarde, Wybrane zagadnienia, Oficyna Wydawnicza Politechniki Warszawskiej, Warszawa 1996.
- [3] M. Leonowicz, J. Magn. Magn. Mater., 83, 211 (1990).
- [4] A. Yan, X. Song, X. Wang, IEEE Trans. Magn., 36, 2033 (2000).
- [5] M. Leonowicz, Arch, nauki o mater., 3, 171 (1997).
- [6] A. Yan, X. Song, M. Song, X. Wang, J. Alloys and Compounds, 257, 273 (1997).
- [7] J. Bernardi, J. Fidler, F. Foedermayr, IEEE Trans. Magn., 28, 2127 (1992).
- [8] W. Kaszuwara. M. Leonowicz, J. Kozubowski, Proc. 16th International Workshop on Rare Earth Magnets and Their Applications, Ed. H. Kaneko, M. Homma, M. Okada, Sendai, 2000, 711.
- [9] A, Przybył, J.J. Wysłocki, W. Kaszuwara, M. Leonowicz, Arch. Mater. Science, 26, 221 (2005).
- [10] W. Kaszuwara, M. Leonowicz, J. Kozubowski, Materials Letters, 42, 383 (2000).
- [11] Z. Bojarski, E. Łągiewka, Rentgenowska analiza strukturalna, Wydawnictwo Uniwersytetu Śląskiego, Katowice 1995.
- [12] H.A. Davies, J. Magn. Magn. Mater., 157-158, 11 (1996).
- [13] M. Leonowicz, J.J. Wysłocki, Współczesne magnesy. Technologie, mechanizmy koercji, zastosowania. Wydawnictwa Naukowo-Techniczne, Warszawa 2005.
- [14] R.C. O'Handley, Modern magnetic materials. Principles and applications, A. Wiley - Interscience Publications, John Wiley & Sons, Inc., Toronto, Canada 2000.
Typ dokumentu
Bibliografia
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bwmeta1.element.baztech-article-BOS5-0015-0003