公开(公告)号：US20180229442A1

公开(公告)日：2018-08-16

申请号：US15432251

申请日：2017-02-14

申请人： UT-Battelle, LLC ,  Iowa State University Research Foundation, Inc. ,  Lawrence Livermore National Laboratory

发明人： Huseyin UCAR ,  Mariappan Parans PARANTHAMAN ,  Orlando RIOS ,  Belther Mojoko MONONO ,  Brian K. POST ,  Vlastimil KUNC ,  Cajetan I. NLEBEDIM ,  R. William MCCALLUM ,  Scott K. MCCALL

IPC分类号： B29C67/00 ,  B22F1/00 ,  B22F3/20 ,  B22F3/24 ,  B22F7/00 ,  B33Y10/00 ,  B33Y40/00 ,  B33Y70/00 ,  B33Y80/00 ,  C22C38/00 ,  H01F41/02 ,  H01F1/059 ,  H01F1/057

CPC分类号： H01F1/057 ,  B22F1/0059 ,  B22F3/008 ,  B22F2001/0066 ,  B22F2998/10 ,  B22F2999/00 ,  B29C64/106 ,  B29K2023/083 ,  B29K2075/00 ,  B29K2105/16 ,  B29K2105/251 ,  B29K2995/0008 ,  B33Y10/00 ,  B33Y40/00 ,  B33Y70/00 ,  B33Y80/00 ,  C22C38/002 ,  C22C38/005 ,  C22C47/14 ,  C22C49/02 ,  C22C49/14 ,  C22C2202/02 ,  H01F1/083 ,  H01F41/0253 ,  B22F3/20 ,  B22F2003/248

摘要： A method for producing a bonded permanent magnet, comprising: (i) incorporating a solid precursor material comprising a thermoplastic crosslinkable polymer and magnetic particles into an additive manufacturing device, wherein the crosslinkable polymer has a delayed crosslinking ability; (ii) melting the precursor material by heating it to a temperature of at least and no more than 10° C. above its glass transition temperature; (iii) extruding the melt through the additive manufacturing device and, as the extrudate exits from the nozzle and is deposited on a substrate as a solidified preform of a desired shape, exposing the resultant extrudate to a directional magnetic field of sufficient strength to align the magnetic particles; and (iv) curing the solidified preform by subjecting it to conditions that result in crosslinking of the thermoplastic crosslinkable polymer to convert it to a crosslinked thermoset. The resulting bonded permanent magnet and articles made thereof are also described.

公开(公告)号：US20170213626A1

公开(公告)日：2017-07-27

申请号：US15415766

申请日：2017-01-25

申请人： UT-Battelle, LLC ,  Iowa State University Research Foundation ,  Lawrence Livermore National Laboratory

发明人： Mariappan Parans PARANTHAMAN ,  Michael A. MCGUIRE ,  David S. PARKER ,  Orlando RIOS ,  Brian C. SALES ,  Huseyin UCAR ,  Scott K. MCCALL ,  R. William MCCALLUM ,  Cajetan I. NLEBEDIM

IPC分类号： H01F1/057 ,  C22C38/00 ,  H01F7/02 ,  C23C14/16 ,  C23C14/35 ,  H01F41/02 ,  C21D6/00

CPC分类号： H01F7/021 ,  C21D6/00 ,  C22C38/002 ,  C22C38/005 ,  C23C14/165 ,  H01F1/0577 ,  H01F41/0293

摘要： A bulk high performance permanent magnet comprising a neodymium-iron-boron core having an outer surface, and a coercivity-enhancing element residing on at least a portion of said outer surface, with an interior portion of said neodymium-iron-boron core not having said coercivity-enhancing element therein. Also described herein is a method for producing the high-coercivity bulk permanent magnet, the method comprising: (i) depositing a coercivity-enhancing element on at least a portion of an outer surface of a neodymium-iron-boron core substrate to form a coated permanent magnet; and (ii) subjecting the coated permanent magnet to a pulse thermal process that heats said outer surface to a substantially higher temperature than an interior portion of said neodymium-iron-boron core substrate, wherein said substantially higher temperature is at least 200° C. higher than said interior portion and is of sufficient magnitude to induce diffusion of said coercivity-enhancing element below said outer surface but outside of said interior portion.