Structural and magnetic engineering of (Nd, Pr, Dy, Tb)–Fe–B sintered magnets with Tb3Co0.6Cu0.4Hx composition in the powder mixture

High-coercivity Nd–Fe–B magnets are required for clean energy applications, particularly for hybrid and electric vehicles. This study was focused on the structural design of a Nd2Fe14B-based magnet by precise engineering of its microstructure, which included grain-boundary diffusion and grain-bounda...

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Bibliographic Details
Published inJournal of magnetism and magnetic materials Vol. 498; p. 1
Main Authors Skotnicova, Katerina, Burkhanov, Gennady S., Kolchugina, Natalia B., Kursa, Miroslav, Cegan, Tomas, Lukin, Alexander A., Zivotsky, Ondrej, Prokofev, Pavel A., Jurica, Jan, Li, Ying
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 15.03.2020
Elsevier BV
Subjects
Aluminum
Clean energy
Coercivity
Composition
Dysprosium
Electric vehicles
Grain boundary diffusion
Grain-boundary structuring
Heat treatment
Hybrid vehicles
Hydrogenated addition
Hysteretic properties
Iron
Low temperature
Magnetic properties
Magnets
Metal strips
Microstructure
Nd–Fe–B sintered magnet
Neodymium
Parameter sensitivity
Praseodymium
Rare earth elements
Sintering (powder metallurgy)
Structural design
Structural stability
Hydrogenated addition
Microstructure
Nd–Fe–B sintered magnet
Hysteretic properties
Grain-boundary structuring
Grain-boundary diffusion
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Summary:High-coercivity Nd–Fe–B magnets are required for clean energy applications, particularly for hybrid and electric vehicles. This study was focused on the structural design of a Nd2Fe14B-based magnet by precise engineering of its microstructure, which included grain-boundary diffusion and grain-boundary structuring processes, through the introduction of a hydrogenated Tb3Co0.6Cu0.4Hx composition in the powder mixture. A low-rare-earth-metal strip-cast Nd-24.0, Pr-6.5, Dy-0.5, B-1.0, Al-0.2, Fe-balance (wt.%) alloy was used as the base component of the powder mixture. The distributions of the components of the blended powder mixture in the sintered magnet with the added 2 wt% of Tb3Co0.6Cu0.4Hx and stability of the structure-sensitive magnetic parameter (coercive force) during a low-temperature heat treatment were studied. The sample exhibited a high coercive force up to 1480 kA/m at a heavy rare-earth element content in the 2–14–1 phase of ~1 at.%.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2019.166220