imã sinterizado de terras-raras à base de r-fe-b, e método para sua produção

In an R-Fe-B based rare-earth sintered magnet according to the present invention, at a depth of 20 µm under the surface of its magnet body, crystal grains of an R 2 Fe 14 B type compound have an (RL 1-x RH x ) 2 Fe 14 B (where 0.2¦x¦0.75) layer with a thickness of 1 nm to 2 µm in their outer perip...

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Bibliographische Detailangaben
Hauptverfasser:	Tomoori Odaka, Hideyuki Morimoto, Koshi Yoshimura
Format:	Patent
Sprache:	por
Schlagworte:	ALLOYS BASIC ELECTRIC ELEMENTS CASTING CHEMISTRY ELECTRICITY FERROUS OR NON-FERROUS ALLOYS INDUCTANCES MAGNETS MAKING METALLIC POWDER MANUFACTURE OF ARTICLES FROM METALLIC POWDER METALLURGY PERFORMING OPERATIONS POWDER METALLURGY SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES TRANSFORMERS TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS WORKING METALLIC POWDER
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Beschreibung
Zusammenfassung:	In an R-Fe-B based rare-earth sintered magnet according to the present invention, at a depth of 20 µm under the surface of its magnet body, crystal grains of an R 2 Fe 14 B type compound have an (RL 1-x RH x ) 2 Fe 14 B (where 0.2¦x¦0.75) layer with a thickness of 1 nm to 2 µm in their outer periphery. In this case, the light rare-earth element RL is at least one of Nd and Pr, and the heavy rare-earth element RH is at least one element selected from the group consisting of Dy, Ho and Tb.