R-(FE,CO)-B SINTERED MAGNET AND MAKING METHOD

An R-(Fe,Co)-B base sintered magnet consisting essentially of 12-17 at% of R containing Nd and Pr, 0.1-3 at% of M 1 (typically Si), 0.05-0.5 at% of M 2 (typically Ti), B, and the balance of Fe, and containing R 2 (Fe,Co) 14 B as a main phase has a coercivity of at least 10 kOe. The magnet contains a...

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Bibliographic Details
Main Authors HIROTA, Koichi, HASHIMOTO, Takahiro, NAKAMURA, Hajime, KAMATA, Masayuki
Format Patent
LanguageEnglish
French
German
Published 28.04.2021
Subjects
BASIC ELECTRIC ELEMENTS
ELECTRICITY
INDUCTANCES
MAGNETS
SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
TRANSFORMERS
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Summary:An R-(Fe,Co)-B base sintered magnet consisting essentially of 12-17 at% of R containing Nd and Pr, 0.1-3 at% of M 1 (typically Si), 0.05-0.5 at% of M 2 (typically Ti), B, and the balance of Fe, and containing R 2 (Fe,Co) 14 B as a main phase has a coercivity of at least 10 kOe. The magnet contains a M 2 boride phase at a grain boundary triple junction, and has a core/shell structure that the main phase is covered with a grain boundary phase. The grain boundary phase is composed of an amorphous and/or nanocrystalline R'-(Fe,Co)-M 1 ' phase consisting essentially of 25-35 at% of R' containing Pr, 2-8 at% of M 1 ' (typically Si), up to 8 at% of Co, and the balance of Fe. A coverage of the main phase with the R'-(Fe,Co)-M 1 ' phase is at least 50%, and the bi-granular grain boundary phase has a width of at least 50 nm.
Bibliography:Application Number: EP20160198513