Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 589, Issue -, Pages 301-306Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2013.11.188
Keywords
Nd-Fe-B; Permanent magnet; Die-upsetting; Hot deformation; Backward extrusion
Categories
Funding
- BMWi (Bundesministerium f. Wirtschaft und Technologie) via IGF (Industrielle Gemeinschaftsforschung)
- AiF (Allianz Industrie Forschung)
- FVA (Forschungsvereinigung Antriebstechnik e.V.)
- DBU (Deutsche Bundesstifung Umwelt)
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In order to reduce the amount of material waste and therefore to use the precious rare earth element Nd in a more efficient way, routes for the production of crack-free hot-deformed nanocrystalline Nd-Fe-B magnets (using melt-spun ribbons as a precursor) have been investigated. In contrast to the conventional route in which material flows into a cavity, pressing tool has been used in order to exert a back pressure during backward extrusion, leading to crack-free and net-shape production of radially oriented ring magnets, without detrimental influence on magnetic properties. Micrographs demonstrate overall good alignment of elongated platelet shaped grains with radially oriented c-axis in most parts of the ring. A mean remanence J(r) = 1.27 T and coercivity mu H-0i(c) = 1.5 T has been obtained. Degree of texture reaches around 0.7. Furthermore, die-upsetting has been performed for different degrees of deformation to obtain crack-free, mechanically and magnetically homogenous, axially oriented tablet magnets. (C) 2013 Elsevier B. V. All rights reserved.
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