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Big Area Additive Manufacturing of High Performance Bonded NdFeB Magnets
Scientific Reports
  • Li Ling, Oak Ridge National Laboratory
  • Angelica Tirado, Oak Ridge National Laboratory
  • I. C. Nlebedim, Ames Laboratory
  • Orlando Rios, Oak Ridge National Laboratory
  • Brian Post, Oak Ridge National Laboratory
  • Vlastimil Kunc, Oak Ridge National Laboratory
  • R. R. Lowden, Oak Ridge National Laboratory
  • Edgar Lara-Curzio, Oak Ridge National Laboratory
  • Magnet Applications, Inc., Magnet Applications, Inc.
  • Magnet Applications, Inc., Magnet Applications, Inc.
  • Thomas A. Lograsso, Iowa State University and Ames Laboratory
  • M. Parans Paranthaman, Oak Ridge National Laboratory
Document Type
Article
Publication Version
Published Version
Publication Date
10-31-2016
DOI
10.1038/srep36212
Abstract

Additive manufacturing allows for the production of complex parts with minimum material waste, offering an effective technique for fabricating permanent magnets which frequently involve critical rare earth elements. In this report, we demonstrate a novel method - Big Area Additive Manufacturing (BAAM) - to fabricate isotropic near-net-shape NdFeB bonded magnets with magnetic and mechanical properties comparable or better than those of traditional injection molded magnets. The starting polymer magnet composite pellets consist of 65 vol% isotropic NdFeB powder and 35 vol% polyamide (Nylon-12). The density of the final BAAM magnet product reached 4.8 g/cm3, and the room temperature magnetic properties are: intrinsic coercivity Hci = 688.4 kA/m, remanence Br = 0.51 T, and energy product (BH)max = 43.49 kJ/m3 (5.47 MGOe). In addition, tensile tests performed on four dogbone shaped specimens yielded an average ultimate tensile strength of 6.60 MPa and an average failure strain of 4.18%. Scanning electron microscopy images of the fracture surfaces indicate that the failure is primarily related to the debonding of the magnetic particles from the polymer binder. The present method significantly simplifies manufacturing of near-net-shape bonded magnets, enables efficient use of rare earth elements thus contributing towards enriching the supply of critical materials.

Comments

This article is published as Li, Ling, Angelica Tirado, I. C. Nlebedim, Orlando Rios, Brian Post, Vlastimil Kunc, R. R. Lowden et al. "Big area additive manufacturing of high performance bonded NdFeB magnets." Scientific Reports 6 (2016): 36212. DOI: 10.1038/srep36212. Posted with permission.

Creative Commons License
Creative Commons Attribution 4.0 International
Copyright Owner
The Authors
Language
en
File Format
application/pdf
Citation Information
Li Ling, Angelica Tirado, I. C. Nlebedim, Orlando Rios, et al.. "Big Area Additive Manufacturing of High Performance Bonded NdFeB Magnets" Scientific Reports Vol. 6 (2016) p. 36212
Available at: http://works.bepress.com/thomas_lograsso/247/