| Naslov: | Microstructure refinement of Nd-Fe-B permanent magnets prepared via spark-plasma sintering |
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| Avtorji: | ID Tomše, Tomaž, Institut "Jožef Stefan" (Avtor) |
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| Datoteke: |  URL - Izvorni URL, za dostop obiščite https://ieeexplore.ieee.org/document/10568241
 PDF - Predstavitvena datoteka, prenos (9,55 MB)
MD5: 1ED5D705822B48505CCF58ED1E66EB4A
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| Jezik: | Angleški jezik |
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| Tipologija: | 1.01 - Izvirni znanstveni članek |
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| Organizacija: |  IJS - Institut Jožef Stefan
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| Povzetek: | Sintered Nd-Fe-B-type permanent magnets are normally manufactured using a conventional powder-metallurgy approach. The limitations of such high-temperature, pressureless sintering methods include restricted control over the microstructure due to grain growth and constraints on the magnet’s geometry. The modern spark-plasma sintering (SPS) technique employs Joule heating and external pressure to offer lower consolidation temperatures and faster heating cycles compared to conventional approaches. As a result, the SPS has the potential for the rapid, low-temperature, net-shape manufacture of magnets. However, the nonequilibrium conditions associated with the SPS can lead to poor grain-boundary wetting and the formation of the soft-magnetic α-iron phase in samples prepared from anisotropic, microcrystalline Nd-Fe-B powders produced by standard procedures, i.e., strip casting, hydrogen decrepitation, and jet-milling. This study revealed that the absence of the Nd-rich grain-boundary film is related to the presence of hydrogen. Degassing the Nd-Fe-B powder before applying the SPS improved the distribution of the grain-boundary phase. Moreover, reducing the electrical currents in the sample during the SPS prevented the decomposition of the RE2Fe14B matrix, ensuring a favorable phase composition. Compared to magnets conventionally sintered at 1070 °C, the mean grain diameter of the SPS samples prepared at ≈880 °C was reduced by ≈33%. This reduction decreased the temperature coefficient of coercivity from -0.65 to -0.58%/°C. The coercivity increase measured for the SPS samples amounted to more than 15%, which was attributed to the combined effect of smaller grain size and reduced texture. |
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| Ključne besede: | spark-plasma sintering, microstructure refinement |
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| Status publikacije: | Objavljeno |
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| Verzija publikacije: | Objavljena publikacija |
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| Poslano v recenzijo: | 28.02.2024 |
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| Datum sprejetja članka: | 18.06.2024 |
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| Datum objave: | 26.07.2024 |
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| Založnik: | IEEE |
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| Leto izida: | 2024 |
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| Št. strani: | str. [1-6] |
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| Številčenje: | Vol. 60, iss. 8, article no. 2100406 |
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| Izvor: | ZDA |
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| PID: | 20.500.12556/DiRROS-21793  |
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| UDK: | 537 |
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| ISSN pri članku: | 1941-0069 |
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| DOI: | 10.1109/TMAG.2024.3417611 |
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| COBISS.SI-ID: | 199982339 |
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| Avtorske pravice: | © 2024 The Authors. |
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| Opomba: | Nasl. z nasl. zaslona;
Opis vira z dne 27. 6. 2024;
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| Datum objave v DiRROS: | 28.03.2025 |
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| Število ogledov: | 705 |
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| Število prenosov: | 302 |
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| Metapodatki: |    |
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