Tomy Company, Ltd.

Sanei Kasei Co., Ltd.

Yuko Kawasaki

Shigenobu Sekine

Hiroji Sato

Chieko Nakazawa

Kazushi Suzuki

Kenji Sakaguchi

Minoru Narita

Koichi Tono

Mitsuhisa Hirata

Yoshiki Kuwabara

Keiji Okada

The method for preparation of sintered permanent magnets according to the present invention comprises the steps of: mixing fully fine powder of a crystalline mother alloy for permanent magnet containing a rare-earth element, Fe and B as the essential components with fine powder of zinc oxide, compaction molding the resulted mixture in the presence of a magnetic field, sintering the compacted mixture in vacuum to cause generation of oxygen and metallic zinc by thermal decomposition of the zinc oxide; segregation of a part of metallic component in the mother alloy at the boundary and inside of the mother alloy crystal; formation of amorphous metallic oxide by forced oxidation of the segregated metal with the generated oxygen; crystallization of the amorphous metallic oxide; formation of an epitaxial junction between the crystallized metallic oxide and the mother alloy crystal; and evaporation of the metallic zinc into the vacuum, and quenching the sintered compact.

Method for preparation of sintered permanent magnet

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Tokyo, Japan

Yuko Kawasaki