Application of the shock compaction technique for consolidation of hard magnetic powders

Marcin Leonowicz , Waldemar Kaszuwara , Elżbieta Jezierska , D. Januszewski , G. Mendoza , H. A. Davies , J. Paszula

Abstract

A shock compaction technique has been successfully applied for the consolidation of hard magnetic powders without appreciable changes in the phase structure and grain size. Pr \#x2013;Fe \#x2013;B and Sm \#x2013;Fe \#x2013;N materials, prepared with the application of melt spinning and mechanical alloying, respectively, were shock compacted with a shock wave speed of 1200 m/s and a pressure of 4.4 GPa. We found that the coercivity of high RE containing material, for which the magnetic hardness is controlled by good magnetic separation of magnetic grains by a RE-rich paramagnetic phase, decreases slightly, by \#x223c;5 \#x2009;\%, due to the closer proximity of the crystallites in a dense material. For low RE, exchange coupled materials, the densification does not change the coercivity. \#xa9; 1998 American Institute of Physics.
Author Marcin Leonowicz ZMKF
Marcin Leonowicz,,
- Division of Construction and Functional Materials
, Waldemar Kaszuwara ZMKF
Waldemar Kaszuwara,,
- Division of Construction and Functional Materials
, Elżbieta Jezierska ZPIM
Elżbieta Jezierska,,
- Division of the Essentials of Materials Engineering
, D. Januszewski
D. Januszewski,,
-
, G. Mendoza
G. Mendoza,,
-
, H. A. Davies
H. A. Davies,,
-
, J. Paszula
J. Paszula,,
-
Journal seriesJournal of Applied Physics, ISSN 0021-8979
Issue year1998
Vol83
No11
Pages6634-6636
Keywords in English6146+w, 6250+p, 7550Kj, 7550Tt, 7550Vv, 7550Ww, 8105Bx, 8105Ys, 8120Ev, boron alloys, coercive force, densification, Grain size, iron alloys, magnetic particles, Mechanical alloying, Melt spinning, Nanostructured materials, permanent magnets, praseodymium alloys, samarium alloys, shock wave effects, transmission electron microscopy
DOIDOI:10.1063/1.367580
Score (nominal)35
Publication indicators WoS Impact Factor: 2006 = 2.316 (2) - 2007=2.38 (5)
Citation count*29 (2015-04-25)
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