Rotational coating of zinc on Nd-Fe-B powders with improved antioxidation performance
Source abstract
Abstract
A newly developed rotational coating process has been used to coat Nd-Fe-B flake-shape powders with Zn. A uniform layer of Zn as thin as 1.5 μm can be coated on the Nd-Fe-B powders under a proper rotational coating condition. The coercivity decreases by about 4.23% and magnetization decrease by only 1.64% after Zn coating. The antioxidation, on the other hand, is greatly improved. The large mass increase during oxidation starts at 400 °C for the Zn-coated powders, 150 °C higher than that of the uncoated powders. In addition, during the high-temperature oxidation experiment from 30 °C to 450 °C, the mass of uncoated powders increases by 2.82%, while the mass of Zn-coated powders only increases by 0.40%. These results prove that the rotational coating is a very effective way to enhance the oxidation resistance of Nd-Fe-B powders, owing to the high-quality coating layer and its good isolation ability for the matrix. The process is also low-cost and easy to achieve mass production, making it a promising technique for producing high-performance Nd-Fe-B powders.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Magnetic Properties of Alloys · Rare-earth and actinide compounds · Hydrogen Storage and Materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (37)
Show source-provided references
1. Substitution strategies for reducing the use of rare earths in wind turbines10.1016/j.resourpol.2017.04.010 ↗
2. Flux maximization in wind turbine permanent magnet synchronous generator made of Nd-Fe-B permanent magnets
3. Review of additive manufacturing of permanent magnets for electrical machines: A prospective on wind turbine10.1016/j.mtphys.2022.100675 ↗
4. Electric vehicle traction motors without rare earth magnets
5. Technology Trends, Challenges, and Opportunities of Reduced-rare-earth PM Motor for Modern Electric Vehicles, Green Energy and Intelligent
6. Identification and recovery of rare-earth permanent magnets from waste electrical and electronic equipment10.1016/j.wasman.2017.07.028 ↗
7. O. Gutfleisch, M.A. Willard, Ekkes Brück, et al., Magnetic Materials and Devices for the 21st Century: Stronger, Lighter, and More Energy Efficient, Adv. Mater. 23 (2011) 821-842.10.1002/adma.201002180 ↗
8. Implementation and analysis of remanufacturing large-scale asynchronous motor to permanent magnet motor under circular economy conditions10.1016/j.jclepro.2021.126233 ↗
9. New material for permanent magnets on a base of Nd and Fe (invited)10.1063/1.333572 ↗
10. The mechanism of coercivity enhancement by the grain boundary diffusion process of Nd-Fe-B sintered magnets10.1016/j.actamat.2012.12.018 ↗
11. Coercivity enhancement mechanism of Tb-diffusion Nd-Fe-B sintered magnets studied by magneto-optical Kerr optical microscope10.1007/s12598-019-01330-2 ↗
12. Simultaneously increasing the magnetization and coercivity of bulk nanocomposite magnets via severe plastic deformation10.1063/1.4824032 ↗
13. Three-Dimensional Self-Assembly of Core/Shell-Like Nanostructures for High-Performance Nanocomposite Permanent Magnets10.1021/acs.nanolett.6b02210 ↗
14. Novel Bimorphological Anisotropic Bulk Nanocomposite Materials with High Energy Products10.1002/adma.201606430 ↗
15. Controllably Manipulating Three-Dimensional Hybrid Nanostructures for Bulk Nanocomposites with Large Energy Products10.1021/acs.nanolett.7b00264 ↗
16. Numerical simulation of single roller melt spinning for Nd-Fe-B alloy based on finite element method10.1007/s12598-019-01229-y ↗
17. Structure and magnetic properties of nanocrystalline dysprosium powders10.1007/s12598-018-01201-2 ↗
18. D.T. Zhang, N.X. Cai, R.C. Zhu, et al., Low-cost Sm_(0.7)Y_(0.3)Co_5 sintered magnet produced by traditional powder metallurgical techniques, Rare Metals. 39 (2020) 421-428.10.1007/s12598-019-01257-8 ↗
19. Hot-pressed neodymium-iron-boron magnets10.1063/1.95884 ↗
20. Development of crystal texture in Nd-lean amorphous Nd9Fe85B6 under hot deformation10.1063/1.3126444 ↗
21. Improvement on corrosion resistance of sintered Nd-Fe-B with bilayer Al/Cr thin films10.1016/j.jmmm.2022.170222 ↗
22. Understanding the Role of Element Grain Boundary Diffusion Mechanism in Nd-Fe-B Magnets10.1002/adfm.202109529 ↗
23. Bonded permanent magnets: Current status and future opportunities (invited)10.1063/1.365471 ↗
24. Recent development in bonded Nd-Fe-B magnets10.1016/S0304-8853(01)00609-6 ↗
25. High-energy isotropic resin bonded magnets produced from (Nd, Dy)-(Fe, Co)-B nanocomposite alloys10.1109/20.951233 ↗
26. Producing injection moulded magnets10.1016/S0026-0657(99)80660-2 ↗
27. High-Energy Extrusion-Molded Nd-Fe-B Magnets10.1109/TJMJ.1994.4565930 ↗
28. Anisotropic Nd-Fe-B based flexible bonded magnet for small permanent magnet motors10.1109/20.908803 ↗
29. Oxidation of Fe-R-B powders during preparation of permanent magnets10.1063/1.338634 ↗
30. The kinetics of oxidation of Nd-Fe-B powders10.1109/20.281027 ↗
31. Oxidation and Antioxidation of Nanocrystalline Powders of Nd-Fe-B
32. Investigation of oxidation resistance of magnetic power coated with silicone10.1016/S0304-8853(96)00692-0 ↗
33. The effect of chemically bonded organic surface layers on the behaviour of fine powders10.1016/j.powtec.2003.11.007 ↗
34. An electrodeposition metal layers method for magnetic powders and warm-pressing preparation of Nd–Fe–B/Sn-bonded magnets10.1080/01694243.2015.1099866 ↗
35. Zinc coatings on Sm2Fe17Nx powder by photoinduced chemical vapour deposition method10.1016/S0925-8388(97)00205-3 ↗
36. High-performance alloyed In metal-bonded magnets produced from Zn/Sm2Fe17Nx powders10.1063/1.373333 ↗
37. Reutilization of Dy strips in rotating diffusion to enhance coercivity of sintered Nd-Fe-B magnets10.1016/j.jmmm.2018.05.073 ↗