DOUBLE SINTERING IN MANUFACTURING THERMOSTABLE PR-DY-FE-CO-В-CU-AL PERMANENT MAGNETS

1 BURKHANOV Gennadii
Co-authors:
2 SEMENOVA Elena 2,6 KARPENKOV Dmitrii 3 LUKIN Aleksandr 1 KOLCHUGINA Natalia 4 CWIK Jacek 4 ROGACKI Krzysztof 5 KURSA Miroslav 5 SKOTNICOVA Katerina
Institutions:
1 Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Moscow, Russia, natalik014@yandex.ru
2 Tver' State University, Tver’, Russia, Semenova_E_M@mail.ru
3 “JSC SPETSMAGNIT”, Moscow, Russia, lukinaalukin@rambler.ru
4 International Laboratory for High Magnetic Fields and Low Temperatures, Polish Academy of Sciences, Wroclaw, Poland, EU,jacek.cwik@ml.pan.wroc.pl
5 Vysoka škola báňská - Technical University of Ostrava, Ostrava, Czech Republic, EU, katerina.skotnicova@vsb.cz
6 Chelyabinsk State University, Chelyabinsk, Russia
Conference:
25th Anniversary International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 25th - 27th 2016
Proceedings:
Proceedings 25th Anniversary International Conference on Metallurgy and Materials
Pages:
1432-1438
ISBN:
978-80-87294-67-3
ISSN:
2694-9296
Published:
14th December 2016
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
89 views / 34 downloads
Abstract

The use of double sintering and rare-earth metal hydride additions allows us to substantially increase the hysteretic parameters of sintered permanent magnets having the composition (wt.%): Pr-14.7, Dy-16.9, Co-24.4, В-1.2, Al-0.3, Cu-0.15, Fe balance. The following magnetic characteristics were reached: Br = 0.95 T, jHc = 1640kA/m, Hk =1370kA/m, BHmax = 176 kJ/m3, temperature coefficient of induction |α|< 0.01 (Т=-60°C to+100 °C). The found weak dependence of structure-sensitive parameters, such as jHc and Hk on the cooling rate from the low-temperature heat-treatment temperature (500 °C) is discussed in connection with the invar and magnetostrictive behavior of the principal magnetic phase (Pr,Dy)2(Fe, Co)14B at temperatures below the Curie temperature, which were used for the low-temperature treatment. Measurements of temperature dependences of the electrical resistivity of the magnets allowed us to demonstrate the presence and absence of the electrical-resistivity anomaly corresponding to the Curie temperature for magnets free from cobalt and with high cobalt content, respectively.

Keywords: Thermostable magnets (Pr,Dy)-(Fe,Co)-B, invar behavior, double sintering, low-temperature #|# treatment, hysteretic parameters

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