公开(公告)号：US20160225500A1

公开(公告)日：2016-08-04

申请号：US15010539

申请日：2016-01-29

申请人： TODA KOGYO CORP.

发明人： Shohei KANEKO ,  Kuniyoshi SHIGEOKA ,  Nobuhiro KATAYAMA ,  Koichiro MORIMOTO

IPC分类号： H01F1/08 ,  C22C38/10 ,  B22F9/02 ,  C22C38/00 ,  H01F1/053 ,  C22C38/14 ,  C22C38/06

CPC分类号： H01F1/083 ,  B22F9/023 ,  B22F2201/013 ,  B22F2203/13 ,  B22F2301/355 ,  B22F2998/10 ,  C22C38/002 ,  C22C38/005 ,  C22C38/06 ,  C22C38/10 ,  C22C38/14 ,  C22C2202/02 ,  H01F1/0572 ,  H01F1/0573 ,  H01F1/0578

摘要： A process for producing R-T-B-based rare earth magnet powder having excellent coercive force and high remanent flux density. A process for producing R-T-B-based rare earth magnet powder by HDDR treatment, in which a raw material alloy for the R-T-B-based rare earth magnet powder includes R (wherein R represents at least one rare earth element including Y), T (wherein T represents Fe, or Fe and Co) and B (wherein B represents boron), and has a composition including R in an amount of between 12.0 atom % and 17.0 atom %, and B in an amount of between 4.5 atom % and 7.5 atom %; the HDDR treatment includes a DR step including a preliminary evacuation step and a complete evacuation step; and a rate of pressure reduction caused by evacuation in the preliminary evacuation step is not less than 1 kPa/min and not more than 30 kPa/min.

摘要翻译： 一种制造具有优良的矫顽力和高剩磁通密度的R-T-B系稀土磁体粉末的方法。 一种通过HDDR处理生产RTB的稀土磁体粉末的方法，其中用于RTB的稀土磁体粉末的原料合金包括R（其中R表示至少一种包含Y的稀土元素），T（其中T 表示Fe或Fe和Co）和B（其中B表示硼），并且其组成包括R为12.0原子％至17.0原子％的量，B为4.5原子％至7.5原子％ ; HDDR处理包括DR步骤，包括预抽真空步骤和完全抽空步骤; 并且在预抽真空步骤中由排气引起的压力降低率不小于1kPa / min且不大于30kPa / min。