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1.发明公开RFeB-BASED MAGNET AND PROCESS FOR PRODUCING RFeB-BASED MAGNET 审中-公开RFEB-BASIERTES MAGNETS VERFAHREN ZUR HERSTELLUNG EINES RFEB-BASIERTEN MAGNETS
公开(公告)号：EP3151252A4
公开(公告)日：2017-07-05
申请号：EP15803329
申请日：2015-05-25
发明人： MIZOGUCHI TETSUHIKO , SAGAWA MASATO
CPC分类号： H01F41/0293 , B22F3/24 , C22C28/00 , C22C38/00 , C22C38/02 , C22C38/06 , C22C38/10 , C23C10/30
摘要： The purpose of the present invention is to provide an RFeB system sintered magnet which has a high and uniform level of coercivity over the entirety of the single magnet even if the magnet is comparatively thick. The present invention is an RFeB system sintered magnet in which a heavy rare-earth element R H which is at least one kind of rare-earth element selected from the group of Dy, Tb and Ho is diffused into a base material through the grain boundaries of the same base material made of a sintered compact of an RFeB system magnet containing R L , Fe and B, where R L represents a light rare-earth element which is at least one kind of rare-earth element selected from the group of Nd and Pr, wherein: the size of the RFeB system sintered magnet at a smallest-size portion is greater than 3 mm; the amount of heavy rare-earth element R H contained in the RFeB system sintered magnet divided by the volume of the RFeB system sintered magnet is equal to or greater than 25 mg/cm 3 ; and the difference between a local coercivity at the surface of the smallest-size portion and a local coercivity in the central region of the smallest-size portion is equal to or less than 15 % of the local coercivity at the surface.
摘要翻译： 本发明的目的在于提供即使磁铁比较厚也能够在整个单一的磁铁上具有高且均匀的矫顽力的RFeB系烧结磁铁。 本发明是一种RFeB系烧结磁体，其中作为选自Dy，Tb和Ho中的至少一种稀土元素的重稀土元素RH通过晶界被扩散到基材中 由含有RL，Fe和B的RFeB系磁体的烧结体构成的相同的基材由RL代表作为选自Nd和Pr中的至少一种稀土元素的轻稀土元素， 其中：在最小尺寸部分处的RFeB系烧结磁体的尺寸大于3mm; RFeB系烧结磁铁中所含的重稀土类元素R H的量除以RFeB系烧结磁铁的体积而成为25mg / cm 3以上， 并且最小尺寸部分的表面处的局部矫顽力与最小尺寸部分的中心区域中的局部矫顽力之间的差等于或小于表面处的局部矫顽力的15％。
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2.发明公开SINTERED MAGNET PRODUCTION DEVICE AND SINTERED MAGNET PRODUCTION METHOD 审中-公开器具，用于产生一种生产烧结磁体的烧结磁铁和方法
公开(公告)号：EP2955731A4
公开(公告)日：2016-01-20
申请号：EP14748535
申请日：2014-02-03
CPC分类号： H01F41/0273 , B22F3/10 , C22C2202/02 , F27B9/067 , F27B9/20 , F27B9/36 , F27B9/38 , F27D5/00 , Y02P10/253
摘要： The present invention addresses the problem of providing a sintered magnet production system using a press-less method capable of minimizing the distortion of a sintered magnet. It is a system including: a filling device 11 for filling a cavity 211 of a container 21 with alloy powder of a material for a sintered magnet; an orienting section 13 for orienting the alloy powder held in the cavity 211 by applying a magnetic field without applying a mechanical pressure to the alloy powder; and a sintering section 15 for sintering the alloy powder oriented by the orienting section 13, by heating the alloy powder without applying a mechanical pressure to the alloy powder. The orienting section includes: an air-core coil 131; and two ferromagnetic members 132 made of a ferromagnetic material to be arranged within the air-core coil 131 at respective open ends of the air-core coil 131 with a space for containing the container 21 in between. The ferromagnetic members 132 adjust the magnetic field within the air-core coil 131 toward a direction parallel to the axis of the air-core coil 131, whereby the distortion of a sintered magnet is minimized.
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公开(公告)号：EP2800108A4
公开(公告)日：2015-08-12
申请号：EP12863318
申请日：2012-12-27
发明人： SAGAWA MASATO , MIZOGUCHI TETSUHIKO
CPC分类号： H01F1/0577 , C22C33/02 , C22C38/005 , C22C2202/02 , H01F41/0293
摘要： Provided is a NdFeB system sintered magnet which is produced by the grain boundary diffusion method and yet has a high coercive force and squareness ratio with only a small decrease in the maximum energy product. A NdFeB system sintered magnet according to the present invention is a NdFeB system sintered magnet having a base material produced by orienting powder of a NdFeB system alloy and sintering the powder, with Dy and/or Tb (the "Dy and/or Tb" is hereinafter called R H ) attached to and diffused from a surface of the base material through the grain boundary inside the base material by a grain boundary diffusion treatment, wherein the difference C s -C d3 between the R H content C s (wt%) in the grain boundary reaching the surface to which R H is attached and the R H content C d3 (wt%) in the grain boundary at a depth of 3 mm from the aforementioned attachment surface is equal to or smaller than 20 wt%.
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公开(公告)号：EP2889883A4
公开(公告)日：2015-10-07
申请号：EP13833670
申请日：2013-08-27
发明人： MIZOGUCHI TETSUHIKO , SAGAWA MASATO
CPC分类号： H01F1/0577 , C22C38/002 , C22C38/005 , C22C38/06 , C22C38/10 , C22C38/16 , H01F1/086 , H01F41/0293
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公开(公告)号：EP2693451A4
公开(公告)日：2014-07-30
申请号：EP12863911
申请日：2012-12-27
发明人： SAGAWA MASATO , MIZOGUCHI TETSUHIKO
CPC分类号： H01F1/0577 , C22C33/0278 , C22C38/00 , C22C38/005 , C22C38/06 , C22C38/10 , C22C38/16 , C22C2202/02 , H01F1/057 , H01F41/0293
摘要： Provided is a NdFeB system sintered magnet which is produced by the grain boundary diffusion method and yet has a high coercive force and squareness ratio with only a small decrease in the maximum energy product. A NdFeB system sintered magnet according to the present invention is a NdFeB system sintered magnet having a base material produced by orienting powder of a NdFeB system alloy and sintering the powder, with Dy and/or Tb (the "Dy and/or Tb" is hereinafter called R H ) attached to and diffused from a surface of the base material through the grain boundary inside the base material by a grain boundary diffusion treatment, wherein the difference C gx -C x between the R H content C gx (wt%) in the grain boundary and the R H content C x (wt%) in main-phase grains which are grains constituting the base material at the same depth within a range from the surface to which R H is attached to a depth of 3 mm is equal to or larger than 3 wt%.
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公开(公告)号：EP2693450A4
公开(公告)日：2014-07-30
申请号：EP12863295
申请日：2012-12-27
发明人： SAGAWA MASATO , MIZOGUCHI TETSUHIKO
CPC分类号： H01F1/0536 , C22C33/0278 , C22C38/00 , C22C2202/02 , H01F1/0577 , H01F7/02 , H01F41/0293
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7.发明公开METHOD FOR PRODUCING NdFeB SINTERED MAGNET 审中-公开VERFAHREN ZUR HERSTELLUNG EINES GESINTERTEN NDFEB-MAGNETS
公开(公告)号：EP2772926A4
公开(公告)日：2015-07-22
申请号：EP12844236
申请日：2012-10-17
CPC分类号： H01F41/0293 , B22F7/02 , B22F2998/10 , C21D9/46 , C22C28/00 , C22C33/0278 , C22C38/12 , C22C2202/02 , H01F1/053 , H01F1/0577 , H01F41/0253 , B22F3/14 , B22F2003/248
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公开(公告)号：EP2696355A4
公开(公告)日：2014-07-30
申请号：EP12861799
申请日：2012-12-27
发明人： SAGAWA MASATO , MIZOGUCHI TETSUHIKO
CPC分类号： H01F7/02 , B22F1/0011 , B22F9/023 , C22C33/02 , H01F1/0557 , H01F1/057 , H01F1/0577 , H01F41/0266 , H01F41/0293
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公开(公告)号：EP2879142A4
公开(公告)日：2015-08-19
申请号：EP13822695
申请日：2013-06-27
发明人： SAGAWA MASATO , MIZOGUCHI TETSUHIKO , UNE YASUHIRO
CPC分类号： H01F41/0266 , B22F3/10 , B22F3/16 , B22F2998/10 , C22C14/00 , C22C33/02 , C22C38/001 , C22C38/005 , C22C38/02 , C22C38/10 , C22C38/16 , C22C2202/02 , H01F1/0536 , H01F1/0573 , H01F1/0577 , H01F1/086 , H01F41/026 , B22F9/023 , B22F9/04
摘要： An objective of the present invention is to provide a method for producing a NdFeB system sintered magnet which, when used as a base material in a grain boundary diffusion method, allows R H to easily diffuse through a rare-earth rich phase, and whose base material itself has high coercive force. The method includes: a hydrogen pulverization process (Step S1), in which coarse powder of a NdFeB system alloy is prepared by coarsely pulverizing a lump of NdFeB system alloy by making this lump occlude hydrogen; a fine pulverization process (Step S2), in which fine powder is prepared by performing fine pulverization for further pulverizing the coarse powder; a filling process (Step S3), in which the fine powder is put into a filling container; an orienting process (Step S4), in which the fine powder as held in the filling container is oriented; and a sintering process (Step S5), in which the fine powder after the orienting process is sintered as held in the filling container. The processes from hydrogen pulverization through orienting are performed with neither dehydrogenation heating nor evacuation each for desorbing hydrogen occluded in the hydrogen pulverization process. The processes from hydrogen pulverization through sintering are performed in an oxygen-free atmosphere.
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公开(公告)号：EP2833376A4
公开(公告)日：2015-06-03
申请号：EP13769202
申请日：2013-03-26
CPC分类号： H01F1/0577 , B22F3/24 , C22C33/0278 , C22C38/00 , C22C38/002 , C22C38/005 , C22C38/06 , C22C38/10 , C22C38/16 , C22C2202/02 , H01F41/0293
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