Abstract
Anisotropic bonded Nd2Fe14B (NdFeB) magnets in a polycarbonate (PC) binder matrix are fabricated using a compression molding process. The weight fractions (w.f.) of NdFeB in PC on the batch mixer are 20, 50, 75, 85 and 95% compared to the twin screw extruder with 20, 50 and 75% respectively. The density of the 95% batch mixed magnets fabricated was 5.34 g/cm3 and the magnetic properties are, intrinsic coercivity Hci = 942.99 kA/m, remanence Br = 0.86 T, and energy product (BH)max = 120.96 kJ/m3. The measured tensile properties are in the range of 27-59 MPa, comparable to that of polyamide (PA), polyphenylene sulfide (PPS) bonded magnets and demonstrating potential for bonded magnet applications. Scanning electron microscopy showed that the onset of failure occurs in the magnetic particle- matrix interface. This study demonstrates that compression additive molding technique can be used to fabricate high performance NdFeB polycarbonate composite magnets with improved mechanical properties.
| Original language | English |
|---|---|
| Article number | 101167 |
| Journal | Materialia |
| Volume | 19 |
| DOIs | |
| State | Published - Sep 2021 |
Funding
“The information, data, or work presented herein was funded in part by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof.” This research was supported by the Tate Technology Inc. Part of the magnetic characterization research was supported by the Critical Materials Institute, an Energy Innovation Hub funded by the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Advanced Manufacturing Office. We also gratefully acknowledge partial graduate and undergraduate students support of this work and use of assets enabled by Institute of Advanced Composites Manufacturing Innovation (IACMI) under U.S. Department of Energy grant numbers DE-EE0006926 . This manuscript has been authored in part by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE). The US government retains and the publisher, by accepting the article for publication, acknowledges that the US government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for US government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( http://energy.gov/downloads/doe-public-access-plan) .
| Funders | Funder number |
|---|---|
| Critical Materials Institute | |
| Institute of Advanced Composites Manufacturing Innovation | DE-EE0006926 |
| Tate Technology Inc. | |
| United States Government | |
| U.S. Department of Energy | |
| Advanced Manufacturing Office | |
| Office of Energy Efficiency and Renewable Energy |
Keywords
- Bonded magnets
- Compression molding
- NdFeB
- Polycarbonate
- Polymer batch mixing
- Twin screw extrusion