R-T-B based permanent magnet

An R-T-B based permanent magnet, excellent in magnetic properties relatively reducing amount of heavy rare earth element used, wherein R represents rare earth element, T iron group element and B boron, includes main phase grains including R2T14B crystal phase and grain boundaries between main phase...

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Bibliographische Detailangaben
Hauptverfasser:	Fujikawa, Yoshinori, Miwa, Masashi, Nagamine, Yuki
Format:	Patent
Sprache:	eng
Schlagworte:	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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Beschreibung
Zusammenfassung:	An R-T-B based permanent magnet, excellent in magnetic properties relatively reducing amount of heavy rare earth element used, wherein R represents rare earth element, T iron group element and B boron, includes main phase grains including R2T14B crystal phase and grain boundaries between main phase grains. Grain boundaries include R-O-C-N concentrated parts where concentrations of R, O, C and N are all higher than in main phase grains. O/R(S)>O/R(C) wherein O/R(S) represents O/R ratio (atomic ratio) in R-O-C-N concentrated parts in a surface of an R-T-B based permanent magnet and O/R(C) represents O/R ratio (atomic ratio) in R-O-C-N concentrated parts in a center of an R-T-B based permanent magnet. A heavy rare earth element RH is in a surface of an R-T-B based permanent magnet as R. R-O-C-N concentrated parts in a surface of an R-T-B based permanent magnet have RH/R ratio (atomic ratio) of 0.2 or less.