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Statements

Subject Item
n2:RIV%2F61989100%3A27360%2F12%3A86084267%21RIV13-MSM-27360___
rdf:type
n16:Vysledek skos:Concept
dcterms:description
The aim of work was the enhancement of coercivity of sintered Nd-Fe-B magnets without obvious reduction of the remanence by diffusing Tb onto the surface of the Nd2Fe14B matrix grains. We have studied the kinetics of TbH2 decomposition in terms of the possible application of the hydride as an effective addition for sintered Nd-Fe-B-based magnets. The diffusion dependence of the decomposition process was demonstrated; the complete decomposition of the TbH2 hydride takes place during heating to 1000 °C. Two Nd-Fe-B magnets were prepared using strip-casting alloy (free from terbium), which was refined by hydrogen decrepitation process. Terbium hydride was added to the mixture (to 2 and 4% Tb concentration in the composition), which was milled in propyl alcohol, compacted, sintered at 1070°C, and subsequently heat treated at 500°C for 2 h. Before sintering, the mixture was passivated in nitrogen flow. The low hydrogen content in the magnets prepared in using TbH2 additions indicates the complete decomposition of the hydride and freeing Tb for introduction into a magnet during sintering the mixture. Electron-microscopic studies of the element composition of near-grain boundary regions and 2-14-1-phase grains and X-ray diffraction studies of the phase composition sintered magnets indicate the required distribution of components in the phases. The coercive force of Nd-Fe-B magnets sintered in using TbH2 hydride was shown to be higher than that for magnets prepared from the initial Tb-containing alloy. The remanence of magnets prepared with the terbium hydride additions demonstrates the unusually moderate decrease with increasing terbium content. The aim of work was the enhancement of coercivity of sintered Nd-Fe-B magnets without obvious reduction of the remanence by diffusing Tb onto the surface of the Nd2Fe14B matrix grains. We have studied the kinetics of TbH2 decomposition in terms of the possible application of the hydride as an effective addition for sintered Nd-Fe-B-based magnets. The diffusion dependence of the decomposition process was demonstrated; the complete decomposition of the TbH2 hydride takes place during heating to 1000 °C. Two Nd-Fe-B magnets were prepared using strip-casting alloy (free from terbium), which was refined by hydrogen decrepitation process. Terbium hydride was added to the mixture (to 2 and 4% Tb concentration in the composition), which was milled in propyl alcohol, compacted, sintered at 1070°C, and subsequently heat treated at 500°C for 2 h. Before sintering, the mixture was passivated in nitrogen flow. The low hydrogen content in the magnets prepared in using TbH2 additions indicates the complete decomposition of the hydride and freeing Tb for introduction into a magnet during sintering the mixture. Electron-microscopic studies of the element composition of near-grain boundary regions and 2-14-1-phase grains and X-ray diffraction studies of the phase composition sintered magnets indicate the required distribution of components in the phases. The coercive force of Nd-Fe-B magnets sintered in using TbH2 hydride was shown to be higher than that for magnets prepared from the initial Tb-containing alloy. The remanence of magnets prepared with the terbium hydride additions demonstrates the unusually moderate decrease with increasing terbium content.
dcterms:title
Preparation of Nd-Fe-B magnets in using TbH2 and study of their structure and magnetic properties Preparation of Nd-Fe-B magnets in using TbH2 and study of their structure and magnetic properties
skos:prefLabel
Preparation of Nd-Fe-B magnets in using TbH2 and study of their structure and magnetic properties Preparation of Nd-Fe-B magnets in using TbH2 and study of their structure and magnetic properties
skos:notation
RIV/61989100:27360/12:86084267!RIV13-MSM-27360___
n16:predkladatel
n19:orjk%3A27360
n5:aktivita
n15:P
n5:aktivity
P(ED0040/01/01)
n5:dodaniDat
n12:2013
n5:domaciTvurceVysledku
n8:8504261 n8:6608787
n5:druhVysledku
n17:D
n5:duvernostUdaju
n10:S
n5:entitaPredkladatele
n21:predkladatel
n5:idSjednocenehoVysledku
161354
n5:idVysledku
RIV/61989100:27360/12:86084267
n5:jazykVysledku
n22:eng
n5:klicovaSlova
magnetic properties; structure; TbH2 hydride; Nd-Fe-B magnets
n5:klicoveSlovo
n6:magnetic%20properties n6:TbH2%20hydride n6:structure n6:Nd-Fe-B%20magnets
n5:kontrolniKodProRIV
[55B9244C2234]
n5:mistoKonaniAkce
Plzeň
n5:mistoVydani
Ostrava
n5:nazevZdroje
COMAT 2012 : [2nd International Conference on] Recent Trends in Structural Materials : conference proceedings : November 21st-22nd 2012, Parkhotel Plzen, Czech Republic, EU
n5:obor
n20:JG
n5:pocetDomacichTvurcuVysledku
2
n5:pocetTvurcuVysledku
4
n5:projekt
n7:ED0040%2F01%2F01
n5:rokUplatneniVysledku
n12:2012
n5:tvurceVysledku
Skotnicová, Kateřina Lukin, A. Kolchugina, N. B. Kursa, Miroslav
n5:typAkce
n14:EUR
n5:zahajeniAkce
2012-11-21+01:00
s:numberOfPages
7
n18:hasPublisher
Tanger s.r.o.
n13:isbn
978-80-87294-34-5
n9:organizacniJednotka
27360