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Title: Strategic coating of NdFeB magnets with Dy to improve the coercivity of permanent magnets

Abstract

We present a method, supported by theoretical analysis, for optimizing the usage of the critical rare earth element dysprosium in (NdFeB)-based permanent magnets. In this method, we use Dy selectively in locations such as magnet edges and faces, where demagnetization factors are largest, rather than uniformly throughout the bulk sample. A200 nm thick Dy film was sputtered onto a commercial N-38, NdFeB magnets with a thickness of 3 mm and post-annealed at temperatures from . Magnets displayed enhanced coercivities after post-annealing and as much as a 5 % increase in the energy product, while requiring a total Dy content of 0.06 wt. % - a small fraction of that used in the commercial grade Dy-NdFeB magnets. By assuming all Dy diffused into NdFeB magnets, the improvement in energy product corresponds to a saving of over 1% Dy (critical element). Magnets manufactured using this technique will therefore be higher performing which would potentially broaden the application space of these magnets in the traction motors of hybrid and pure electric vehicles, and wind generators.

Authors:
 [1];  [1];  [2];  [2];  [3];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Ames Lab., Ames, IA (United States)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Critical Materials Institute (CMI); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Advanced Manufacturing Office
OSTI Identifier:
1286953
Alternate Identifier(s):
OSTI ID: 1409963
Report Number(s):
LLNL-JRNL-688660
Journal ID: ISSN 2234-0912
Grant/Contract Number:  
AC05-00OR22725; AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Advances in Materials Research
Additional Journal Information:
Journal Volume: 4; Journal Issue: 4; Journal ID: ISSN 2234-0912
Publisher:
Techno-Press
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; NdFeB magnets; sputter deposition; selective Dy diffusion; magnetic properties; theoretical analysis

Citation Formats

Ucar, Huseyin, Parker, David S., Nlebedim, I. C., McCallum, R. W., McCall, S. K., and Parans Paranthaman, M. Strategic coating of NdFeB magnets with Dy to improve the coercivity of permanent magnets. United States: N. p., 2015. Web. doi:10.12989/amr.2015.4.4.227.
Ucar, Huseyin, Parker, David S., Nlebedim, I. C., McCallum, R. W., McCall, S. K., & Parans Paranthaman, M. Strategic coating of NdFeB magnets with Dy to improve the coercivity of permanent magnets. United States. https://doi.org/10.12989/amr.2015.4.4.227
Ucar, Huseyin, Parker, David S., Nlebedim, I. C., McCallum, R. W., McCall, S. K., and Parans Paranthaman, M. Fri . "Strategic coating of NdFeB magnets with Dy to improve the coercivity of permanent magnets". United States. https://doi.org/10.12989/amr.2015.4.4.227. https://www.osti.gov/servlets/purl/1286953.
@article{osti_1286953,
title = {Strategic coating of NdFeB magnets with Dy to improve the coercivity of permanent magnets},
author = {Ucar, Huseyin and Parker, David S. and Nlebedim, I. C. and McCallum, R. W. and McCall, S. K. and Parans Paranthaman, M.},
abstractNote = {We present a method, supported by theoretical analysis, for optimizing the usage of the critical rare earth element dysprosium in (NdFeB)-based permanent magnets. In this method, we use Dy selectively in locations such as magnet edges and faces, where demagnetization factors are largest, rather than uniformly throughout the bulk sample. A200 nm thick Dy film was sputtered onto a commercial N-38, NdFeB magnets with a thickness of 3 mm and post-annealed at temperatures from . Magnets displayed enhanced coercivities after post-annealing and as much as a 5 % increase in the energy product, while requiring a total Dy content of 0.06 wt. % - a small fraction of that used in the commercial grade Dy-NdFeB magnets. By assuming all Dy diffused into NdFeB magnets, the improvement in energy product corresponds to a saving of over 1% Dy (critical element). Magnets manufactured using this technique will therefore be higher performing which would potentially broaden the application space of these magnets in the traction motors of hybrid and pure electric vehicles, and wind generators.},
doi = {10.12989/amr.2015.4.4.227},
journal = {Advances in Materials Research},
number = 4,
volume = 4,
place = {United States},
year = {Fri Dec 25 00:00:00 EST 2015},
month = {Fri Dec 25 00:00:00 EST 2015}
}