- 专利标题: Method for producing R-Fe-B based permanent magnet alloy recycled material having removed carbon
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申请号: US14125715申请日: 2012-06-29
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公开(公告)号: US09657367B2公开(公告)日: 2017-05-23
- 发明人: Katsuyoshi Furusawa , Atsushi Kikugawa
- 申请人: Katsuyoshi Furusawa , Atsushi Kikugawa
- 申请人地址: JP Tokyo
- 专利权人: HITACHI METALS, LTD.
- 当前专利权人: HITACHI METALS, LTD.
- 当前专利权人地址: JP Tokyo
- 代理机构: Kratz, Quintos & Hanson, LLP
- 优先权: JP2011-145338 20110630
- 国际申请: PCT/JP2012/066712 WO 20120629
- 国际公布: WO2013/002376 WO 20130103
- 主分类号: C22B7/00
- IPC分类号: C22B7/00 ; H01F41/02 ; C22B1/00 ; B22F8/00 ; C22B59/00
摘要:
An object of the present invention is to provide a method for producing an alloy recycled material by effectively removing carbon from a carbon-containing alloy, which is produced as scrap or sludge of an R—Fe—B based permanent magnet, a used magnet, or the like. The method of the present invention as a means for resolution is characterized in that a carbon-containing R—Fe—B based permanent magnet alloy is subjected to an HDDR treatment to remove carbon. An alloy recycled material produced by the method of the present invention contains a reduced amount of carbon. Therefore, in the case where it is recycled for the production of a magnet, even when an increased amount is subjected to high-frequency heating in a vacuum melting furnace, a non-negligible increase in the amount of carbon contained in the produced magnet can be avoided.
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