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

Povzetek

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.

Ključne besede

rapid sintering;finite-element modeling;

Podatki

Jezik: Angleški jezik
Leto izida:
Tipologija: 1.01 - Izvirni znanstveni članek
Organizacija: IJS - Institut Jožef Stefan
Založnik: Wiley
UDK: 537
COBISS: 206480131 Povezava se bo odprla v novem oknu
ISSN: 1527-2648
Št. ogledov: 167
Št. prenosov: 54
Ocena: 0 (0 glasov)
Metapodatki: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Ostali podatki

Sekundarne ključne besede: Prašna metalurgija;Sintri (metalurgija);Trajni magneti;Mikrostruktura;
Komentar vira: Nasl. z nasl. zaslona; Soavtorji: Aljaž Ivekovič, Andraž Kocjan, Sašo Šturm, Kristina Žužek; Opis vira z dne 5. 9. 2024;
Strani: str. 1-12
Letnik: ǂVol. ǂ26
Zvezek: ǂiss. ǂ23, [article no.] 2401404
Čas izdaje: Dec. 2024
DOI: 10.1002/adem.202401404
ID: 26125405