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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Li, Ying
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (8/8 displayed)
- 2024Understanding the multifunctional anticorrosion protective mechanism of epoxy-based coatings modified with hydrogel and benzotriazole conveying nanotubes for Q235 steel protection in 3.5 % NaClcitations
- 2024Enhancing the Tribological Characteristics of Epoxy Composites by the Use of Three-Dimensional Carbon Fibers and Cobalt Oxide Nanowirescitations
- 2022Comparative study on the isothermal reduction kinetics of iron oxide pellet fines with carbon-bearing materials
- 2022Freestanding Perovskite Oxide Films:Synthesis, Challenges, and Propertiescitations
- 2022Freestanding Perovskite Oxide Filmscitations
- 2020Smart polymers for advanced applications: a mechanical perspective reviewcitations
- 2020Predictions of the glass transition temperature and viscosity of organic aerosols from volatility distributionscitations
- 2003The oxidation of NdFeB magnetscitations
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article
The oxidation of NdFeB magnets
Abstract
The oxidation kinetics in air of a commercial NdFeB magnet have been investigated over the temperature range 335-500degreesC The oxide microstructure has been characterized by SEM, XRD and cross-sectional TEM. The results show that the external scale formed consists of an outer layer of Fe2O3 and an inner layer of Fe3O4 but that the principal degradation process is the formation of an extensive zone of internal oxidation. HREM has been used to show that this zone contains NdO particles embedded in an alpha-Fe matrix. These particles are discrete and very small, approximately 2 nm in diameter, and have an amorphous structure. The alpha-Fe matrix has a columnar grain structure with a grain width of approximately 100 nm. It is argued that the high rates of internal oxidation arise because the external-oxide layers are not protective at the oxidation temperature, and oxygen penetrates to the zone front by fast diffusion along the columnar alpha-Fe grain boundaries.