PROCESS FOR PRODUCING MAGNETIC POWDER AND PROCESS FOR PRODUCING DUST CORE

WIPO Patent Application WO/2007/142075

A1

A process for producing a magnetic powder which is sufficiently reduced in core losses such as iron loss and hysteresis loss and has sufficient strength; and a process for producing a dust core. The process for magnetic powder production comprises using a magnetic-material powder produced by water atomization as a raw powder and subjecting the powder to sphering in which a mechanical impact is applied to the powder to sphere the powder particles. After the sphering, the powder is subjected to a particle enlargement treatment in which the powder is annealed at a temperature not lower than the austenite transformation point. The process for dust core production comprises compacting the magnetic powder thus produced.

HOSHINA, Eisuke (1 Toyota-cho, Toyota-shi, Aichi 71, 4718571, JP)
保科 栄介 (〒71 愛知県豊田市トヨタ町１番地 トヨタ自動車株式会社内 Aichi, 4718571, JP)
YAMAGUCHI, Toshiya (1 Toyota-cho, Toyota-shi, Aichi 71, 4718571, JP)

JP2007/060886

December 13, 2007

May 29, 2007

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TOYOTA JIDOSHA KABUSHIKI KAISHA (1 Toyota-cho, Toyota-shi, Aichi 71, 4718571, JP)
トヨタ自動車株式会社 (〒71 愛知県豊田市トヨタ町１番地 Aichi, 4718571, JP)
FINE SINTER CO., LTD. (10-3, Minamidai 1-chomeKawagoe-shi, Saitama 65, 3501165, JP)
株式会社ファインシンター (〒65 埼玉県川越市南台１丁目１０番３号 Saitama, 3501165, JP)
HOSHINA, Eisuke (1 Toyota-cho, Toyota-shi, Aichi 71, 4718571, JP)

H01F1/20; B22F1/00; C21D6/00; H01F27/255; H01F41/02

COSMOS PATENT OFFICE (Annex 2nd Floor, Nagoya Center Building2-22, Nishiki 2-chome, Naka-k, Nagoya-shi Aichi 03, 4600003, JP)

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