STRUCTURE AND PHASE COMPOSITION OF TB3CO0.6CU0.4 ALLOYS FOR EFFICIENT ADDITIONS TO ND-FE-B SINTERED MAGNETS

1 BURKHANOV Gennady S.
Co-authors:
2 LUKIN Alexander A. 1,3 KOLCHUGINA Natalia B. 3 KOSHKID’KO Yurii S. 3 CWIK Jacek 4 SKOTNICOVÁ Kateřina 4 ČEGAN Tomáš 1,2 PROKOF’EV Pavel A. 5 DRULIS Henryk 5 HACKEMER Alicja
Institutions:
1 Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Moscow, Russia, natalik014@yandex.ru
2 “JSC SPETSMAGNIT”, Moscow, Russia, lukinaalukin@rambler.ru
3 International Laboratory for High Magnetic Fields and Low Temperatures, Polish Academy of Sciences, Wroclaw, Poland, EU, jacek.cwik@ml.pan.wroc.pl
4 Vysoká škola báňská - Technical University of Ostrava, Ostrava, Czech Republic, EU, Katerina.Skotnicova@vsb.cz
5 Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Wroclaw, Poland, EU, H.Drulis@int.pan.wroc.pl
Conference:
26th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 24th - 26th 2017
Proceedings:
Proceedings 26th International Conference on Metallurgy and Materials
Pages:
1775-1781
ISBN:
978-80-87294-79-6
ISSN:
2694-9296
Published:
9th January 2018
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
40 views / 12 downloads
Abstract

Currently, many attempts have been taken to enhance the coercivity and reduce the heavy rare-earth consumption of Nd–Fe–B sintered magnets simultaneously. Some progresses have been made in efforts to introduce Dy and/or Tb in many forms, namely, oxides, fluorides, hydrides, intermetallic compounds and alloys. The Tb3Co0.6Cu0.4 composition was suggested to apply it as the efficient addition in manufacturing sintered Nd-Fe-B-based magnets. The alloy was prepared by arc melting in purified argon atmosphere, annealed at 600 C for 90 h and subsequently subjected to hydrogenation. The phase composition and structure of the initial and hydrogenated alloy were studied by electron microscopy, electron microprobe and X-ray diffraction analyses. The in part substitution of copper for cobalt does not change the orthorhombic Fe3C-type structure (space group Pnma) of the Tb3Co compound. The copper solubility in the Tb3Co and Tb12Co7 compounds was determined and the lattice parameters of the compositions were estimated. During hydrogenation, the Tb3Co0.6Cu0.4 composition was shown to decompose into TbH2-3 hydride and fine dispersed (Co, Cu) mixture. Additions of the hydrogenated compound to Nd-Fe-B-based sintered magnets (the initial composition (wt.%) is Nd-24.0, Pr-6.5, Dy-0.5, B-1.0, Al-0.2, Fe-balance was prepared by strip-casting technique and subjected to hydrogen decrepitation) allow us to manufacture magnets with Br = 1.35 T and jHc = 1336 kA/m.

Keywords: Co-Cu-Tb intermetallics, microstructure, hydrogenation, Nd-Fe-B magnets

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