Direct-write 3D printing of NdFeB bonded magnets |
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| Authors: | Brett Gibson Compton James William Kemp Timofei V Novikov Robert Cody Pack Cajetan I Nlebedim Chad Edward Duty |
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| Affiliation: | 1. Mechanical, Aerospace, and Biomedical Engineering Department, University of Tennessee, Knoxville, TN, USAbcompto1@utk.edu;3. Materials Science and Engineering Department, University of Tennessee, Knoxville, TN, USA;4. Mechanical, Aerospace, and Biomedical Engineering Department, University of Tennessee, Knoxville, TN, USA;5. Critical Materials Institute, Ames Laboratory, Ames, IA, USA;6. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA |
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| Abstract: | We report a method to fabricate Nd–Fe–B (NdFeB) bonded magnets of complex shape via extrusion-based additive manufacturing (AM), also known as 3D-printing. We have successfully formulated a 3D-printable epoxy-based ink for direct-write AM with anisotropic MQA NdFeB magnet particles that can be deposited at room temperature. The new feedstocks contain up to 40 vol.% MQA anisotropic NdFeB magnet particles, and they are shown to remain uniformly dispersed in the thermoset matrix throughout the deposition process. Ring, bar, and horseshoe-type 3D magnet structures were printed and cured in air at 100°C without degrading the magnetic properties. This study provides a new pathway for fabricating NdFeB bonded magnets with complex geometry at low temperature, and presents new opportunities for fabricating multifunctional hybrid structures and devices. |
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| Keywords: | 3D printing bonded magnets direct-write magnetic properties NdFeB |
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