公开(公告)号：US20210366636A1

公开(公告)日：2021-11-25

申请号：US17394003

申请日：2021-08-04

Applicant: Toda Kogyo Corp.

Inventor： Nobuhiro KATAYAMA ,  Hirofumi KAWASAKI ,  Koichiro MORIMOTO

IPC: H01F1/057 ,  C22C38/00 ,  C22C38/14 ,  C22C38/10 ,  C22C38/06 ,  H01F41/02

Abstract: The present invention provides R-T-B-based rare earth magnet particles comprising no expensive rare resources such as Dy and having an excellent coercive force which can be produced by HDDR treatment without any additional steps. The present invention relates to R-T-B-based rare earth magnet particles comprising crystal grains comprising a magnetic phase of R2T14B, and a grain boundary phase, in which the grain boundary phase has a composition comprising R in an amount of not less than 13.5 atom % and not more than 35.0 atom % and Al in an amount of not less than 1.0 atom % and not more than 7.0 atom %. The R-T-B-based rare earth magnet particles can be obtained by controlling heat treatment conditions in the DR step of the HDDR treatment in the course of subjecting a raw material alloy to the HDDR treatment.

公开(公告)号：US20210375513A1

公开(公告)日：2021-12-02

申请号：US17399333

申请日：2021-08-11

Applicant: TODA KOGYO CORP.

Inventor： Nobuhiro KATAYAMA ,  Hirofumi KAWASAKI ,  Koichiro MORIMOTO

IPC: H01F1/057 ,  C21D6/00 ,  B22F9/04 ,  C22C38/06 ,  C22C33/02 ,  C22C38/00 ,  C22C38/10 ,  C22C38/14

Abstract: An object of the present invention is to enhance a coercive force of magnetic particles by promoting formation of a continuous R-rich grain boundary phase in a crystal grain boundary of a magnetic phase of the particles, and to thereby obtain R-T-B-based rare earth magnet particles further having a high residual magnetic flux density. The present invention relates to production of R-T-B-based rare earth magnet particles capable of exhibiting a high coercive force even when a content of Al therein is reduced, and a high residual magnetic flux density, in which formation of an R-rich grain boundary phase therein can be promoted by heat-treating Al-containing R-T-B-based rare earth magnet particles obtained by HDDR treatment in vacuum or in an Ar atmosphere at a temperature of not lower than 670° C. and not higher than 820° C. for a period of not less than 30 min and not more than 300 min.

公开(公告)号：US20190027283A1

公开(公告)日：2019-01-24

申请号：US16068179

申请日：2016-12-28

Applicant: TODA KOGYO CORP.

Inventor： Nobuhiro KATAYAMA ,  Koichiro MORIMOTO

IPC: H01F1/047 ,  B22F1/00 ,  C22C22/00 ,  C22C30/00 ,  B22F3/24

Abstract: A Mn—Bi-based magnetic powder, which contains a hexagonal Mn—Bi-based magnetic phase containing Sn and has a Sn content of 0.2 to 5 at % with respect to a sum of Mn, Bi and Sn, is provided. In addition, a bond magnet containing a kneaded product of this Mn—Bi-based magnetic powder with a resin binder is provided. Furthermore, a Mn—Bi-based metal magnet, which contains a hexagonal Mn—Bi-based magnetic phase containing Sn and has a Sn content of 0.2 to 5 at % with respect to a sum of Mn, Bi and Sn, is provided.

公开(公告)号：US20160225500A1

公开(公告)日：2016-08-04

申请号：US15010539

申请日：2016-01-29

Applicant: TODA KOGYO CORP.

Inventor： Shohei KANEKO ,  Kuniyoshi SHIGEOKA ,  Nobuhiro KATAYAMA ,  Koichiro MORIMOTO

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

CPC classification number: 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

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US20140266525A1

公开(公告)日：2014-09-18

申请号：US14205894

申请日：2014-03-12

Applicant: TODA KOGYO CORP.

Inventor： Nobuhiro KATAYAMA ,  Hirofumi KAWASAKI ,  Koichiro MORIMOTO

IPC: H01F1/06 ,  H01F7/02 ,  H01F41/00

CPC classification number: H01F1/0573 ,  B22F9/04 ,  B22F2998/10 ,  B22F2999/00 ,  C21D6/00 ,  C21D2201/00 ,  C22C33/0278 ,  C22C38/002 ,  C22C38/005 ,  C22C38/06 ,  C22C38/10 ,  C22C38/14 ,  C22C2202/02 ,  H01F1/0578 ,  B22F2201/013 ,  B22F1/0085 ,  B22F2201/20 ,  B22F2201/11

Abstract: An object of the present invention is to enhance a coercive force of magnetic particles by promoting formation of a continuous R-rich grain boundary phase in a crystal grain boundary of a magnetic phase of the particles, and to thereby obtain R-T-B-based rare earth magnet particles further having a high residual magnetic flux density. The present invention relates to production of R-T-B-based rare earth magnet particles capable of exhibiting a high coercive force even when a content of Al therein is reduced, and a high residual magnetic flux density, in which formation of an R-rich grain boundary phase therein can be promoted by heat-treating Al-containing R-T-B-based rare earth magnet particles obtained by HDDR treatment in vacuum or in an Ar atmosphere at a temperature of not lower than 670° C. and not higher than 820° C. for a period of not less than 30 min and not more than 300 min.

Abstract translation: 本发明的目的是通过促进在粒子的磁性相的晶界中形成连续的富R相的晶界而提高磁性粒子的矫顽力，由此得到RTB系稀土类磁铁 颗粒进一步具有高剩余磁通密度。 本发明涉及即使当其中Al含量降低时也能表现出高矫顽力的RTB型稀土磁体颗粒的生产和高残余磁通密度，其中形成富R晶界相 可以通过在真空中或在Ar气氛中在不低于670℃且不高于820℃的温度下热处理由HDDR处理获得的含有Al的RTB基稀土磁体颗粒来促进其中的 时间不少于30分钟，不超过300分钟。

公开(公告)号：US20130265128A1

公开(公告)日：2013-10-10

申请号：US13835754

申请日：2013-03-15

Applicant: TODA KOGYO CORP.

Inventor： Nobuhiro KATAYAMA ,  Hirofumi KAWASAKI ,  Koichiro MORIMOTO

IPC: H01F7/02 ,  H01F1/01 ,  H01F41/00

CPC classification number: H01F7/02 ,  B22F1/0085 ,  B22F2999/00 ,  C22C33/02 ,  C22C38/002 ,  C22C38/005 ,  C22C38/06 ,  C22C38/10 ,  C22C38/14 ,  C22C2202/02 ,  H01F1/01 ,  H01F1/0573 ,  H01F1/0578 ,  H01F41/005 ,  B22F2201/013 ,  B22F2203/11

Abstract: R-T-B-based rare earth magnet particles are produced by an HDDR treatment which comprises a first stage HD step of heating particles of a raw material alloy having a composition of R, B and Co in an inert atmosphere or in a vacuum atmosphere and then replacing the atmosphere with a hydrogen-containing gas atmosphere in which the raw material alloy particles are held in the same temperature range and a second stage HD step of heating a material obtained in the first stage HD step in which the material is held in the hydrogen-containing gas atmosphere.

Abstract translation: 通过HDDR处理生产RTB型稀土磁体颗粒，其包括在惰性气氛或真空气氛中加热具有R，B和Co组成的原料合金的颗粒的第一阶段HD步骤，然后将 含有原料合金颗粒保持在相同温度范围的含氢气体气氛的气氛，以及第二阶段HD步骤，将在第一阶段HD步骤中获得的材料加热，其中所述材料保持在含氢气体 气体气氛。