公开(公告)号：US20170256344A1

公开(公告)日：2017-09-07

申请号：US15511299

申请日：2015-08-31

Applicant: HITACHI METALS, LTD.

Inventor： Teppei SATOH ,  Futoshi KUNIYOSHI ,  Rintaro ISHII ,  Ryouichi YAMAGATA

IPC: H01F1/08 ,  C22C33/02 ,  H01F41/02

CPC classification number: H01F1/08 ,  B22F3/24 ,  B22F2999/00 ,  C21D6/00 ,  C22C33/02 ,  C22C38/00 ,  C22C38/06 ,  C22C38/16 ,  H01F1/0577 ,  H01F41/02 ,  C22C2202/02

Abstract: A method for manufacturing an R-T-B based sintered magnet includes: 1) a step of preparing an R-T-B based sintered magnet material by sintering a molded body, the sintered magnet material having a particular composition and satisfying inequality expressions (1) and (2); 2) a high-temperature heat treatment step of heating the sintered magnet material to a heating temperature of 730° C. to 1,020° C. and then cooling the sintered magnet material to 300° C. at a cooling rate of 5° C./min or more; and 3) a low-temperature heat treatment step of heating the sintered magnet material after the high-temperature heat treatment step to 440° C. to 550° C.: [T]−72.3[B]>0  (1) ([T]−72.3[B])/55.85

公开(公告)号：US20160284468A1

公开(公告)日：2016-09-29

申请号：US14915801

申请日：2014-09-01

Applicant: HITACHI METALS, LTD.

Inventor： Ryouichi YAMAGATA ,  Rintaro ISHII ,  Futoshi KUNIYOSHI ,  Teppei SATOH

IPC: H01F41/02 ,  B22F3/24

CPC classification number: H01F41/0266 ,  B22F3/24 ,  B22F2003/248 ,  C21D6/00 ,  C22C33/02 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/06 ,  C22C38/10 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C2202/02 ,  H01F1/0577 ,  H01F41/0293

Abstract: Disclosed is a method for producing a magnet, including a step of preparing a magnet represented by the formula: uRwBxGayCuzAlqM(balance)T, where RH is 5% or less, 0.20≦x≦0.70, 0.07≦y≦0.2, 0.05≦z≦0.5, 0≦q≦0.1; when 0.40≦x≦0.70, v and w satisfy the following inequality expressions: 50w−18.5≦v≦50w−14, and −12.5w+38.75≦v≦−62.5w+86.125; and, when 0.20≦x≦0.40, v and w satisfy the following inequality expressions: 50w−18.5≦v≦50w−15.5 and −12.5w+39.125≦v≦−62.5w+86.125, and x satisfy the following inequality expression: −(62.5w+v −81.625)/15+0.5≦x≦−(62.5w+v−81.625)/15+0.8; a high-temperature heat treatment step of heating the magnet to a temperature of 730° C. or higher and 1,020° C. or lower, and then cooling to 300° C. at a cooling rate of 20° C./min; and a low-temperature heat treatment step of heating the magnet to a temperature of 440° C. or higher and 550° C. or lower.

Abstract translation: 公开了一种制造磁体的方法，包括以下公式制备磁铁的步骤：uRwBxGayCuzAlqM（余量）T，其中RH为5％以下，0.20≤x≤0.70,0.07≤y≤0.2,0.05≤z ≤0.5,0≤q≤0.1; 当0.40≤x≤0.70时，v和w满足以下不等式：50w-18.5≤v≤50w-14，-12.5w +38.75≤v≤-62.5w + 86.125; 并且当0.20≤x≤0.40时，v和w满足以下不等式：50w-18.5≤v≤50w-15.5和-12.5w +39.125≤v≤-62.5w + 86.125，x满足以下不等式： - （62.5w + v -81.625）/15+0.5宜克斯 - （62.5w + v-81.625）/15+0.8; 将该磁体加热至730℃以上且1020℃以下的高温热处理工序，然后以20℃/分钟的冷却速度冷却至300℃。 以及将磁体加热至440℃以上且550℃以下的低温热处理工序。

公开(公告)号：US20170323722A1

公开(公告)日：2017-11-09

申请号：US15528781

申请日：2016-02-23

Applicant: Hitachi Metals, Ltd.

Inventor： Ryouichi YAMAGATA ,  Futoshi KUNIYOSHI

IPC: H01F41/02 ,  B22F3/06 ,  H01F1/055 ,  B22F3/24 ,  B22F9/04 ,  C22C38/16 ,  C22C38/10 ,  C22C38/06 ,  C22C38/00 ,  C22C30/02

CPC classification number: H01F41/0253 ,  B22F3/06 ,  B22F3/24 ,  B22F9/04 ,  B22F2003/248 ,  B22F2009/049 ,  C22C30/02 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/06 ,  C22C38/10 ,  C22C38/16 ,  C22C2202/02 ,  H01F1/0551 ,  H01F1/0557 ,  H01F1/0577 ,  H01F41/0293

Abstract: A method for producing a sintered R-T-B based magnet of this disclosure includes the steps of preparing a plurality of sintered R-T-B based magnet bodies (R is at least one of rare earth elements and necessarily contains Nd and/or Pr; and T is at least one of transition metals and necessarily contains Fe); preparing a plurality of alloy powder particles having a size of 90 μm or less and containing a heavy rare earth element RH (the heavy rare earth RH is Tb and/or Dy) at a content of 20 mass % or greater and 80 mass % or less; loading the plurality of sintered R-T-B based magnet bodies and the plurality of alloy powder particles of a ratio of 2% by weight or greater and 15% by weight or less with respect to the plurality of sintered R-T-B based magnet bodies into a process chamber; and heating, while rotating and/or swinging, the process chamber to move the sintered R-T-B based magnet bodies and the alloy powder particles continuously or intermittently to perform an RH supply and diffusion process.