Rare earth permanent magnets and their preparation

A rare earth permanent magnet is prepared by disposing a powdered metal alloy containing at least 70 vol% of an intermetallic compound phase on a sintered body of R-Fe-B system, and heating the sintered body having the powder disposed on its surface below the sintering temperature of the sintered bo...

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Bibliographic Details
Main Authors MINOWA, TAKEHISA, NAGATA, HIROAKI, NOMURA, TADAO
Format Patent
LanguageEnglish
French
German
Published 17.09.2008
Subjects
ALLOYS
BASIC ELECTRIC ELEMENTS
CHEMISTRY
ELECTRICITY
FERROUS OR NON-FERROUS ALLOYS
INDUCTANCES
MAGNETS
METALLURGY
SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
TRANSFORMERS
TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Summary:A rare earth permanent magnet is prepared by disposing a powdered metal alloy containing at least 70 vol% of an intermetallic compound phase on a sintered body of R-Fe-B system, and heating the sintered body having the powder disposed on its surface below the sintering temperature of the sintered body in vacuum or in an inert gas for diffusion treatment. The advantages include efficient productivity, excellent magnetic performance, a minimal or zero amount of Tb or Dy used, an increased coercive force, and a minimized decline of remanence.
Bibliography:Application Number: EP20080250927