Method of manufacturing fully dense Nd-Fe-B magnets with enhanced coercivity and gradient microstructure

The present invention relates to a method of manufacturing fully dense Nd-Fe-B magnets by mixing Nd-Fe-B ribbons with a powder containing a heavy rare earth metal. The mixture comprises 1-4 wt% of the heavy rare earth metal and is in the first step spark plasma sintered to a fully dense nanocrystall...

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Bibliographic Details
Main Authors Soderznik, Marko, Andraz, Kocjan, Spomenka, Kobe, Zagar, Kristina, McGuiness, Paul John
Format Patent
LanguageEnglish
French
German
Published 24.06.2020
Subjects
BASIC ELECTRIC ELEMENTS
ELECTRICITY
INDUCTANCES
MAGNETS
SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
TRANSFORMERS
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Summary:The present invention relates to a method of manufacturing fully dense Nd-Fe-B magnets by mixing Nd-Fe-B ribbons with a powder containing a heavy rare earth metal. The mixture comprises 1-4 wt% of the heavy rare earth metal and is in the first step spark plasma sintered to a fully dense nanocrystalline Nd-Fe-B magnet and subsequently in a second step annealed to allow the diffusion of the heavy rare earth metal. With this method an enhancement of coercivity of approximately 30 % can be achieved.
Bibliography:Application Number: EP20130005137