公开(公告)号：US20180226189A1

公开(公告)日：2018-08-09

申请号：US15842039

申请日：2017-12-14

申请人： Tianhe (Baotou) Advanced Tech Magnet Co., Ltd.

发明人： Shujie Wu ,  Yi Dong ,  Shulin Diao ,  Shuai Zhang ,  Yi Yuan ,  Ya Chen ,  Wenjie Yuan

IPC分类号： H01F41/02 ,  H01F1/053 ,  C25D3/66 ,  C25D7/00

CPC分类号： H01F41/0266 ,  C25D3/665 ,  C25D5/18 ,  C25D5/50 ,  C25D7/001 ,  H01F1/0536 ,  H01F1/0577 ,  H01F41/0293

摘要： The disclosure discloses a method for preparing a permanent magnet material. In this method, an ionic liquid electroplating process is used to electroplate a heavy rare earth metal onto a surface of a sintered magnet to form a magnet with a coating, wherein the sintered magnet has a thickness of 10 mm or less in at least one direction; in the ionic liquid electroplating process, an electroplating solution comprises an ionic liquid, a heavy rare earth salt, a group VIII metal salt, an alkali metal salt and an additive, an anode is a heavy rare earth metal or a heavy rare earth alloy, a cathode is the sintered magnet, an electroplating temperature is 20-50° C., an electroplating time is 15-80 min. The preparation method of the disclosure can improve an intrinsic coercive force of the magnet with low cost and high production efficiency. A utilization rate of heavy rare earth is high.