Patent ID: 11869690
Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  C | IPC B  C  H

Claim 4:
5. A method for producing the rare earth magnet according to claim 1, the rare earth magnet-producing method comprising:
preparing a rare earth magnet precursor including a main phase having a composition represented by, in molar ratio, R12T14B (R1 is one or more elements selected from the group consisting of Y and rare earth elements and T is one or more transition elements mandatorily containing one or more elements selected from the group consisting of Fe, Co and Ni) and a grain boundary phase present around the main phase,
allowing a modifier containing at least R2 and Ce to diffuse and penetrate inside the rare earth magnet precursor, and
before the modifier diffuses and penetrates inside the rare earth magnet precursor, allowing an auxiliary modifier to diffuse and penetrate inside the rare earth magnet precursor, wherein:
the auxiliary modifier contains at least R4, where R4 is one or more elements selected from the group consisting of Pr, Nd, Pm, Sm and Eu.