ALLOY FOR ANISOTROPIC EXCHANGE-SPRING MAGNET AND METHOD FOR PRODUCING EXCHANGE-SPRING MAGNET

Japanese Patent JP3941418

B2

PROBLEM TO BE SOLVED: To provide a method for producing an anisotropic exchange-spring magnet which has excellent magnet characteristics.
SOLUTION: The production method for an anisotropic exchange-spring magnet consists of a process where an NdFeB based rare earth magnet alloy in which a hard magnetic phase and a soft magnetic phase having size of ≤80 nm are coexistent, and the size of the partially anisotropic region in which the direction of the axis of easy magnetization is uniform are ≥0.1 μm is held at 750 to 900°C for 30 min to 2 hr in a hydrogen current, is held at 750 to 900°C for 30 min to 1 hr under the hydrogen partial pressure of ≤1 Torr, and is cooled for 30 min to 1 hr under the hydrogen partial pressure of ≤1 Torr to produce an alloy for an anisotropic exchange-spring magnet, and the alloy is pulverized into the size in the partially anisotropic region or less to obtain magnet powder a process where the magnet powder is compacted in the magnetic field obtain a compact and a process where the compact is subjected to discharge plasma sintering to obtain a bulk magnet.

Munekatsu Shimada
Hideaki Ono
Norihisa Waki

JP2001147832A

July 04, 2007

May 17, 2001

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Nissan Motor Co., Ltd

C21D6/00; C21D8/12; C22C38/00; H01F1/057; H01F1/08; H01F41/02; (IPC1-7): C21D8/12; C21D6/00; C22C38/00; H01F1/08; H01F41/02

JP8041502A
JP6220502A
JP2000357606A
JP10032134A
JP11008109A

Mikio Hatta
Atsushi Nogami
Yasuo Nara
Etsuko Saito
Katsuyuki Utani

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