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US 12,603,200 B2Granted
Rare earth sintered magnet, method for producing rare earth sintered magnet, rotor, and rotary machine
AssigneeMitsubishi Electric Corporation
InventorsAkito Iwasaki, Yukina Yoshioka, Yoshikazu Nakano, Yasutaka Nakamura
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Abstract
A rare earth sintered magnet according to the present disclosure includes: a main phase satisfying general formula (Nd, La, Sm)—Fe—B and including crystal grains based on R2Fe14B crystal structures; and a crystalline subphase based on an oxide phase represented by (Nd, La, Sm)—O. The subphase has a higher concentration of Sm than the main phase.
Claims10
A rare earth sintered magnet comprising:
- a main phase satisfying general formula (Nd, La, Sm)—Fe—B and including a crystal grain based on an R2Fe14B crystal structure;
- and
- a crystalline subphase based on an oxide phase represented by (Nd, La, Sm)—O, wherein
- a part of Nd in the crystalline subphase is replaced by La and Sm such that a concentration at % of Sm in the crystalline subphase is higher than a concentration at % of Sm in the main phase,
- wherein 1<Y2/Y<X2/X1 is satisfied, where X1 represents the concentration at % of La contained in the main phase, X2 represents the concentration at % of La contained in the subphase, Y1 represents the concentration at % of Sm contained in the main phase, and Y2 represents the concentration at % of Sm contained in the subphase.
2 more elements
Dependencies are inferred from the claim text.