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

Kód výsledku v 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>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20501 - Materials engineering

Projekt

<a href="/cs/project/LO1203" target="_blank" >LO1203: Regionální materiálově technologické výzkumné centrum - Program udržitelnosti</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2015

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

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

Počet stran výsledku

6

Strana od-do

1693-1698

Název nakladatele

Tanger

Místo vydání

Ostrava

Místo konání akce

Brno

Datum konání akce

3. 6. 2015

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

000374706100275