Structure and phase composition of Tb3Co0.6Cu0.4 alloys for efficient additions to Nd-Fe-B sintered magnets

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27360%2F17%3A10238193" target="_blank" >RIV/61989100:27360/17:10238193 - 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

Structure and phase composition of Tb3Co0.6Cu0.4 alloys for efficient additions to Nd-Fe-B sintered magnets

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Structure and phase composition of Tb3Co0.6Cu0.4 alloys for efficient additions to Nd-Fe-B sintered magnets

Popis výsledku anglicky

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.

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)<br>S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název statě ve sborníku

METAL 2017: conference proceedings : 26th International Conference on Metallurgy and Materials : (reviewed version) : May 24th-26th 2017, Hotel Voroněž I, Brno, Czech Republic, EU

ISBN

978-80-87294-79-6

ISSN

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e-ISSN

neuvedeno

Počet stran výsledku

6

Strana od-do

1775-1780

Název nakladatele

Tanger

Místo vydání

Ostrava

Místo konání akce

Brno

Datum konání akce

24. 5. 2017

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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