METHOD FOR RECYCLING RARE EARTH ELEMENT MAGNET SCRAP AND BONDED MAGNET RESULTING THEREFROM

WIPO Patent Application WO/2003/056582

A1

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.

SUZUKI SHUNJI (JP)
MACHIDA KEN-ICHI (JP)
ITOH MASAHIRO (JP)

PCT/JP2002/013620

July 10, 2003

December 26, 2002

Click for automatic bibliography generation  

OSAKA IND PROMOTION ORG (JP)
SUZUKI SHUNJI (JP)
MACHIDA KEN-ICHI (JP)
ITOH MASAHIRO (JP)

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

JP2001355050A

2001-12-25

Sugawara, Seirin (Sakae 2-chome Naka-ku Nagoya-shi, Aichi, JP)

View/Download PDF      PDF Help

Previous Patent: IMPROVEMENTS RELATING TO OPERATION OF A CURRENT CONTROLLER

Next Patent: COPPER TANTALATE COMPOSITIONS CONTAINING TRIVALENT CATIONS