Stability of high-coercivity state of Nd-Fe-B sintered magnets prepared with DyH2 additions

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27360%2F15%3A86096283" target="_blank" >RIV/61989100:27360/15:86096283 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Stability of high-coercivity state of Nd-Fe-B sintered magnets prepared with DyH2 additions
Original language description
The effect of low temperature treatment on the structure and hysteretic properties of Nd-Fe-B magnets, which were prepared using strip casting alloy (wt%) Nd - 24%, Pr - 6.5%, Dy - 0.5%, B - 1 %, Al - 0.2%, Fe - balance and 2 wt % DyH2 addition, has been studied. Hysteretic properties of the magnets subjected to the optimum heat treatment are Br = 1.29 T, jHc = 1309 kA/m, Hk = 1220 kA/m, (BH)max = 322 kJ/m3. The subsequent combined heat treatment at 250 to 500 oC (for 20 h) does not change the hysteretic properties. The degradation of magnetic properties (decrease in jHc and Hk to 1105 and 960 kA/m, respectively) is observed only after the repeated annealing at 550 oC. The hysteretic properties of the magnets can be restored completely by heat treatment 1050 oC (1 h) + 500 oC (2 h). The data obtained demonstrate the higher thermal stability of hysteretic properties of magnets prepared from hydride containing powder mixtures. The observed effect is attributed to the formation of a non-uniform Dy distribution in (Nd, Pr, Dy)2Fe14B principal magnetic phase grains.
Czech name
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Czech description
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Project
<a href="/en/project/LO1203" target="_blank" >LO1203: Regional Materials Science and Technology Centre - Feasibility Program</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2015
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection
METAL 2015 : 24th International Conference on Metallurgy and Materials : conference proceedings : June 3rd-5th 2015, Hotel Voroněž I, Brno, Czech Republic, EU
ISBN
978-80-87294-62-8
ISSN
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e-ISSN
neuvedeno
Number of pages
6
Pages from-to
1693-1698
Publisher name
Tanger
Place of publication
Ostrava
Event location
Brno
Event date
Jun 3, 2015
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
000374706100275

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