-
公开(公告)号：US20180182519A1
公开(公告)日：2018-06-28
申请号：US15832173
申请日：2017-12-05
发明人： Masaaki Ito , Noritsugu Sakuma , Tetsuya Shoji , Hidefumi Kishimoto , Masao Yano
CPC分类号： H01F1/0577 , H01F41/005 , H01F41/0293
摘要： A rare earth magnet includes a main phase, a grain boundary phase present around the main phase and an intermediate phase interposed between the main phase and the grain boundary phase, and has an overall composition that is represented by the formula ((Ce(1-x)Lax)(1-y)R1y)pT(100-p-q-r)BqM1r.(R21-zM2z)s (where, R1 and R2 are rare earth elements other than Ce and La, T is at least one selected from among Fe, Ni, and Co, M1 is an element having a small amount that does not influence magnetic characteristics, and M2 is an alloy element for which a melting point of R21-zM2z is lower than a melting point of R2). A total concentration of Ce and La is higher in the main phase than in the intermediate phase, and a concentration of R2 is higher in the intermediate phase than in the main phase.
-
公开(公告)号：US20180141072A1
公开(公告)日：2018-05-24
申请号：US15570243
申请日：2016-04-18
CPC分类号： B05B13/0221 , B05D1/02 , B05D3/02 , B22F3/00 , B22F3/24 , B22F2003/248 , C22C38/00 , H01F1/057 , H01F1/0577 , H01F1/086 , H01F41/0293
摘要： When a slurry s obtained by dispersing a rare-earth-compound powder in a solvent is applied to sintered magnet bodies m, and dried to remove the solvent in the slurry and cause the surfaces of the sintered magnet bodies to be coated with the powder, and the sintered magnet bodies coated with the powder are heat treated to cause the rare-earth element to be absorbed by the sintered magnet bodies, the sintered magnet bodies m are warmed or heated before the slurry s is applied. As a result, the rare-earth-compound powder can be efficiently and uniformly applied to the surfaces of the sintered magnet bodies.
-
公开(公告)号：US20180122571A1
公开(公告)日：2018-05-03
申请号：US15798138
申请日：2017-10-30
发明人： Shinobu TAKAGI
IPC分类号： H01F41/02
CPC分类号： H01F41/0253 , H01F41/0293
摘要： The present invention relates to a method for producing an RFeB-based magnet, including: an RH-containing-substance adhesion step in which an RH-containing slurry obtained by mixing an organic solvent with an RH-containing powder that contains at least one heavy rare earth element RH selected from the group consisting of Dy, Tb and Ho, is blown, in a form of dots or a line, onto a surface of a base material including an RFeB-based sintered magnet or RFeB-based hot-plastic worked magnet which contains a rare earth element R, Fe, and B, thereby adhering an RH-containing substance to the surface of the base material; and a heating step in which the base material to which the RH-containing substance has been adhered is heated to a predetermined temperature at which the heavy rare earth element RH in the RH-containing substance diffuses into the base material through grain boundaries of the base material.
-
公开(公告)号：US20180090249A1
公开(公告)日：2018-03-29
申请号：US15710341
申请日：2017-09-20
发明人： Tetsuya Ohashi , Tetsuya Kume , Koichi Hirota , Hajime Nakamura
CPC分类号： H01F1/0577 , B22F3/16 , B22F3/24 , B22F2003/248 , C22C38/005 , H01F41/0293
摘要： An R—Fe—B base sintered magnet is prepared through the steps of providing an alloy fine powder having a predetermined composition, compression shaping the alloy fine powder in an applied magnetic field into a compact, sintering the compact at a temperature of 900-1,250° C. into a sintered body, cooling the sintered body to 400° C. or below, high-temperature heat treatment including placing a metal, compound or intermetallic compound containing HR which is Dy, Tb and/or Ho, on the surface of the sintered body, heating at a temperature from more than 950° C. to 1,100° C., for causing grain boundary diffusion of HR into the sintered body, and cooling to 400° C. or below, and low-temperature heat treatment including heating at a temperature of 400-600° C. and cooling to 300° C. or below. The sintered magnet produces a high coercivity despite a low content of Dy, Tb and Ho.
-
公开(公告)号：US09928956B2
公开(公告)日：2018-03-27
申请号：US13928990
申请日：2013-06-27
申请人： Makoto Kitahara
发明人： Makoto Kitahara
CPC分类号： H01F41/0293 , H01F1/0577 , H01F7/02 , H01F41/0253
摘要： In permanent magnets formed by division, a cut-out part is provided in a straight line in the matrix of the permanent magnets, a metal increasing the coercive force the permanent magnet matrix is diffused into the interior of the matrix from a surface that includes the surface of the cut-out part of the permanent magnet matrix, and the permanent magnet matrix is divided into multiple permanent magnet parts along the straight cut-out part to form the permanent magnets. An Nd—Fe—B sintered magnet may be used as the permanent magnet matrix, and dysprosium (Dy) may be used as the metal increasing the coercive force of the permanent magnet. Multiple indentations disposed in a straight line may be used as the cut-out parts, or a straight groove may also be used.
-
公开(公告)号：US20180025820A1
公开(公告)日：2018-01-25
申请号：US15656284
申请日：2017-07-21
申请人： TDK Corporation
发明人： Ayato KAKOKI , Makoto IWASAKI , Tetsuya HIDAKA , Takuma HAYAKAWA
CPC分类号： H01F1/0577 , B22F3/16 , B22F9/04 , B22F2009/044 , B22F2201/11 , B22F2202/05 , B22F2301/45 , B22F2998/10 , B22F2999/00 , C22C28/00 , C22C30/02 , C22C38/002 , C22C38/005 , C22C38/06 , C22C38/10 , C22C38/14 , C22C38/16 , C22C2202/02 , H01F41/0293 , B22F9/023 , B22F1/0059 , B22F3/087 , B22F3/14 , B22F2003/248
摘要： An R-T-B based sintered magnet containing a first heavy rare earth element, in which R includes Nd, T includes Co and Fe, the first heavy rare earth element includes Tb or Dy, the R-T-B based sintered magnet has a region in which a concentration of the first heavy rare earth element decreases from the surface toward the inside, a first grain boundary phase which contains the first heavy rare earth element and Nd but does not contain Co is present in one cross section including the region, and an area occupied by the first grain boundary phase in one cross section including the region is 1.8% or less.
-
公开(公告)号：US20180025819A1
公开(公告)日：2018-01-25
申请号：US15550818
申请日：2016-02-16
申请人： HITACHI METALS, LTD.
IPC分类号： H01F1/057 , B22F1/00 , C22C28/00 , H01F41/02 , C22C38/06 , C22C38/02 , C22C38/04 , B22F3/24 , C22C38/00
CPC分类号： H01F1/0577 , B22F1/0011 , B22F3/24 , B22F2998/10 , B22F2999/00 , C22C28/00 , C22C38/002 , C22C38/005 , C22C38/02 , C22C38/04 , C22C38/06 , C22C2202/02 , H01F41/0266 , H01F41/0293 , B22F3/02 , B22F2202/05 , B22F9/04 , B22F3/10 , B22F2003/248 , B22F2201/10 , B22F2201/20
摘要： A step of providing an R1-T1-X (where R1 is mainly Nd; T1 is mainly Fe; and X is mainly B) based sintered alloy compact mainly characterized by a molar ratio of [T1]/[X] being 13.0 or more; a step or providing an R2-Ga—Cu (where R2 is mainly Pr and/or Nd and accounts for not less than 65 mol % and not more than 95 mol %; and [Cu]/([Ga]+[Cu]) is not less than 0.1 and not more than 0.9 by mole ratio) based alloy; and a step of, while allowing at least a portion of a surface of the R1-T1-X based sintered alloy compact to be in contact with at least a portion of the R2-Ga—Cu based alloy, performing a heat treatment at a temperature which is not less than 450° C. and not more than 600° C.
-
公开(公告)号：US09845545B2
公开(公告)日：2017-12-19
申请号：US14624779
申请日：2015-02-18
CPC分类号： C25D7/001 , C25D5/34 , C25D5/50 , C25D13/02 , C25D13/12 , C25D13/22 , H01F1/053 , H01F1/0577 , H01F41/005 , H01F41/0293
摘要： A rare earth permanent magnet is prepared by immersing a portion of a sintered magnet body of R1—Fe—B composition (wherein R1 is a rare earth element) in an electrodepositing bath of a powder dispersed in a solvent, the powder comprising an oxide, fluoride, oxyfluoride, hydride or rare earth alloy of a rare earth element, effecting electrodeposition for letting the powder deposit on a region of the surface of the magnet body, and heat treating the magnet body with the powder deposited thereon at a temperature below the sintering temperature in vacuum or in an inert gas.
-
公开(公告)号：US09721724B2
公开(公告)日：2017-08-01
申请号：US13822659
申请日：2011-08-05
申请人： Tohru Obata
发明人： Tohru Obata
IPC分类号： H01F41/00 , C22C38/00 , C22C38/06 , C22C38/10 , C22C38/16 , H01F41/02 , C22C33/02 , H01F1/057
CPC分类号： H01F41/00 , C22C33/02 , C22C38/002 , C22C38/005 , C22C38/06 , C22C38/10 , C22C38/16 , C22C2202/02 , H01F1/0577 , H01F41/0293
摘要： [Problem] To provide a highly efficient manufacturing method including an RH supply-diffusion process by which the number of magnets processed at a time can be increased without allowing sintered R-T-B based magnets to stick to holding members.[Solution] A method for producing a sintered R-T-B based magnet including the steps of: forming a stack of RH diffusion sources and sintered R-T-B based magnet bodies by stacking the diffusion sources and the magnet bodies alternately with a holding member having openings interposed; and carrying out an RH supply-diffusion process by loading the stack into a process vessel and creating an atmosphere with a pressure of 0.1 Pa to 50 Pa and a temperature of 800° C. to 950° C. within the process vessel.
-
公开(公告)号：US20170178778A1
公开(公告)日：2017-06-22
申请号：US15268725
申请日：2016-09-19
发明人： Huayun Mao , Baogui Cai , Lujun Liu , Jinhong Zhang
CPC分类号： H01F1/442 , H01F1/0577 , H01F1/42 , H01F7/02 , H01F41/0293
摘要： The present invention, on the one hand, provides a neodymium iron boron magnet, comprising neodymium iron boron magnet blank and the RTMH alloy layer compounded on the surface; the R is one or more selected from rare earth elements; the T is Fe and/or Co; the M is one or more selected from the group consisting of Al, Si, Ti, V, Cr, Mn, Ni, Cu, Zn, Ga, Ge, Zr, Nb, Mo, Ag, In, Sn, Sb, Hf, Ta, W, Pt, Au, Pb and Bi; the H is hydrogen element. By the present invention, the coercive force of magnets is significantly enhanced, and at the same time, the original magnetic remanence and maximum magnetic energy product of the magnets are not significantly reduced.
-
-
-
-
-
-
-
-
-
搜索结果
515 条记录 (耗时 0.029 秒)
