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Title: Studies on in situ magnetic alignment of bonded anisotropic Nd-Fe-B alloy powders

We presented some considerations for achieving high degree of alignment in polymer bonded permanent magnets via the results of a study on in situ magnetic alignment of anisotropic Nd-Fe-B magnet powders. Contributions from effect of the alignment temperature, alignment magnetic field and the properties of the polymer on the hard magnetic properties of the bonded magnet were considered. Moreover, the thermo-rheological properties of the polymer and the response of the magnet powders to the applied magnetic field indicate that hard magnetic properties were optimized at an alignment temperature just above the melting temperature of the EVA co-polymer. This agrees with an observed correlation between the change in magnetization due to improved magnetic alignment of the anisotropic powders and the change in viscosity of the binder. Finally, manufacturing cost can be minimized by identifying optimum alignment temperatures and magnetic field strengths.
 [1] ;  [2] ;  [2] ;  [1] ;  [3] ;  [1] ;  [2]
  1. Ames Lab., Ames, IA (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Report Number(s):
LLNL-JRNL-698023; IS-J-9071
Journal ID: ISSN 0304-8853
Grant/Contract Number:
AC52-07NA27344; AC02-07CH11358; AC05-00OR22725
Accepted Manuscript
Journal Name:
Journal of Magnetism and Magnetic Materials
Additional Journal Information:
Journal Volume: 422; Journal Issue: C; Journal ID: ISSN 0304-8853
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Ames Laboratory (AMES), Ames, IA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Advanced Manufacturing Office (EE-5A)
Country of Publication:
United States
36 MATERIALS SCIENCE; polymer binders; high performance bonded magnets
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1325874; OSTI ID: 1342935; OSTI ID: 1359366