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Title:
METHOD FOR RECYCLING RARE EARTH ELEMENT MAGNET SCRAP AND BONDED MAGNET RESULTING THEREFROM
Document Type and Number:
WIPO Patent Application WO/2003/056582
Kind Code:
A1
Abstract:
A method for recycling a defective from a production process or a waste (hereinafter referred to as a scrap) of a rare earth element magnet, which comprises providing, as a part or the whole of a raw material for an alloy, a scrap of a rare earth element magnet which exhibits uniaxial magnetic anisotropy and has a hard magnetic main phase comprised of an intermetallic compound between a rare earth element and a transition metal element, melting the raw material for an alloy, cooling rapidly the resultant molten alloy so as to form a crystalline structure wherein the hard magnetic main phase is present in the state of fine particles having an average particle size of 1 μm or less, to prepare a rapidly cooled crystalline material, and optionally pulverizing the material, thereby producing a powder for a bonded magnet. The method allows the efficient transformation of a scrap of a rare earth element magnet to a powder for a bonded magnet with a reduced man-hour and energy, which leads to the effective use of rare earth element resources.

Inventors:
Suzuki, Shunji (94 Isshiki, Fukudecho Iwata-gun, Shizuoka, 437-1216, JP)
Machida, Ken-ichi (Room 401, 5-tou Green Hill Higashiminoo, Aomadaninishi 1-chome Minoo-shi Osaka, 562-0023, JP)
Itoh, Masahiro (Room 203, 12 Egami-cho 2-chome Nishinomiya-shi, Hyogo, 662-0855, JP)
Application Number:
PCT/JP2002/013620
Publication Date:
July 10, 2003
Filing Date:
December 26, 2002
Export Citation:
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Assignee:
OSAKA INDUSTRIAL PROMOTION ORGANIZATION c/o Mydome, Osaka 2-5 (Honmachibashi Chuo-ku Osaka-shi, Osaka, 540-0029, JP)
Suzuki, Shunji (94 Isshiki, Fukudecho Iwata-gun, Shizuoka, 437-1216, JP)
Machida, Ken-ichi (Room 401, 5-tou Green Hill Higashiminoo, Aomadaninishi 1-chome Minoo-shi Osaka, 562-0023, JP)
Itoh, Masahiro (Room 203, 12 Egami-cho 2-chome Nishinomiya-shi, Hyogo, 662-0855, JP)
International Classes:
B22D11/06; B22F8/00; B22F9/04; C22B1/00; C22B7/00; C22B59/00; C22C33/02; C22C38/00; H01F1/053; H01F1/08; (IPC1-7): H01F41/00; B22F3/00; C22B7/00; H01F1/04
Foreign References:
JP2001355050A2001-12-25
Attorney, Agent or Firm:
Sugawara, Seirin (Sakae Yamakichi Bldg. 9-30, Sakae 2-chome Naka-ku Nagoya-shi, Aichi, 460-0008, JP)
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