Mechanical activated self-sustaining combustion synthesis of Mn3AlC magnetic powder from MnO2+Al+C mixture
Research on rare earth-free permanent magnets (REFPMs) as substitutes for rare earth permanent magnets (REPMs) has attracted extensive attention, primarily due to their affordability, reduced supply risk, and encouraging magnetic properties. In the present work, a rare earth-free magnetic powder con...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-05-01
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| Series: | Heliyon |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2405844025017487 |
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| Summary: | Research on rare earth-free permanent magnets (REFPMs) as substitutes for rare earth permanent magnets (REPMs) has attracted extensive attention, primarily due to their affordability, reduced supply risk, and encouraging magnetic properties. In the present work, a rare earth-free magnetic powder consisting of Mn3AlC was prepared for the first time through a mechanical activation-aided self-propagating combustion process using a highly exothermic MnO2-Al-C mixture. This study aims to assess the possibility of producing Mn3AlC through low-cost raw materials with an energy-conserving process. The experimental procedure entailed changing the milling time and modifying the aluminum and carbon content to determine their impact on the synthesis reaction. X-ray diffraction (XRD) was used for analyzing the phase structure, while field emission scanning electron microscopy (FE-SEM) and energy dispersive X-ray spectroscopy (EDS) were utilized for identifying the microstructure and chemical composition, respectively. Magnetic properties were examined by vibrating-sample magnetometer (VSM). The examination revealed that a sudden and violent self-sustaining reaction took place after 5 h of mechanical activation, leading to the full conversion of the mixture to Mn3AlC and Al2O3. There were no intermediate phases before the reaction onset. The optimal stoichiometries of aluminum and carbon were 2 and 0.8, respectively. |
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| ISSN: | 2405-8440 |