Tomaž Tomše (Author), Aljaž Iveković (Author), Andraž Kocjan (Author), Sašo Šturm (Author), Kristina Žužek Rožman (Author)

Abstract

The green transition has spiked demand for high-performance sintered Nd-Fe-B permanent magnets, necessitating advanced powder consolidation technologies to enhance production efficiency. This study explores the rapid sintering methodology for an Nd-Fe-B powder using a radiation-assisted sintering approach. The case study material is an industrially used powder, prepared through strip-casting, hydrogen decrepitation, and jet milling, with a mean particle size of 5.5 µm. The powder is sintered to full density in a modified Spark Plasma Sintering furnace, achieving pressureless conditions and eliminating electrical currents in the sample to preserve grain alignment and prevent decomposition of the hard-magnetic phase. Fully-dense samples are obtained with heating rates ranging from 10 to 200 °C/min and up to 5 minutes of dwell time at 1100 °C. Rapid heating results in grain size and microstructure comparable to conventionally sintered magnets prepared from the same powder, without compromising magnetic performance after post-sinter annealing at 520 °C for 120 minutes. This sintering method contributes to a novel strategy for optimizing magnet production by utilizing efficient thermal-radiation heat transfer. The combination of rapid heating and pressureless sintering drastically reduces heat-up and dwell times, providing a fundamental advantage over slow conventional sintering.

Keywords

rapid sintering;finite-element modeling;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: IJS - Jožef Stefan Institute
Publisher: Wiley
UDC: 537
COBISS: 206480131 Link will open in a new window
ISSN: 1527-2648
Views: 167
Downloads: 54
Average score: 0 (0 votes)
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Other data

Secondary keywords: Prašna metalurgija;Sintri (metalurgija);Trajni magneti;Mikrostruktura;
Source comment: Nasl. z nasl. zaslona; Soavtorji: Aljaž Ivekovič, Andraž Kocjan, Sašo Šturm, Kristina Žužek; Opis vira z dne 5. 9. 2024;
Pages: str. 1-12
Volume: ǂVol. ǂ26
Issue: ǂiss. ǂ23, [article no.] 2401404
Chronology: Dec. 2024
DOI: 10.1002/adem.202401404
ID: 26125405