Awais Ikram (Avtor), Muhammad Awais (Avtor), Richard Stuart Sheridan (Avtor), Allan Walton (Avtor), Spomenka Kobe (Avtor), Franci Pušavec (Avtor), Kristina Žužek Rožman (Avtor)

Povzetek

Fully dense spark plasma sintered recycled and fresh HDDR Nd-Fe-B nanocrystalline bulk magnets were processed by surface grain boundary diffusion (GBD) treatment to further augment the coercivity and investigate the underlying diffusion mechanism. The fully dense SPS processed HDDR based magnets were placed in a crucible with varying the eutectic alloys Pr68Cu32 and Dy70Cu30 at 2-20 wt. % as direct diffusion source above the ternary transition temperature for GBD processing followed by secondary annealing. The changes in mass gain was analyzed and weighted against the magnetic properties. For the recycled magnet, the coercivity (HCi) values obtained after optimal GBDP yielded ~60% higher than the starting recycled HDDR powder and 17.5% higher than the SPS-ed processed magnets. The fresh MF-15P HDDR Nd-Fe-B based magnets gained 25-36% higher coercivities with Pr-Cu GBDP. The FEG-SEM investigation provided insight on the diffusion depth and EDXS analysis indicated the changes in matrix and intergranular phase composition within the diffusion zone. The mechanism of surface to grain boundary diffusion and the limitations to thorough grain boundary diffusion in the HDDR Nd-Fe-B based bulk magnets were detailed in this study.

Ključne besede

redki zemeljski trajni magneti;recikliranje;sintranje s plazmo;postopek difuzije meje zrn (GBDP);visoka magnetna koercivnost;rare earth permanent magnets;HDDR Nd2Fe14B;recycling;spark plasma sintering;grain boundary diffusion processing (GBDP);high coercivity;

Podatki

Jezik: Angleški jezik
Leto izida:
Tipologija: 1.01 - Izvirni znanstveni članek
Organizacija: UL FS - Fakulteta za strojništvo
UDK: 537.6(045)
COBISS: 25316867 Povezava se bo odprla v novem oknu
ISSN: 1996-1944
Št. ogledov: 159
Št. prenosov: 67
Ocena: 0 (0 glasov)
Metapodatki: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Ostali podatki

Sekundarni jezik: Slovenski jezik
Sekundarni naslov: Omejitve pri procesiranju kristalnih mej recikliranega sistema HDDR Nd-Fe-B
Sekundarne ključne besede: redki zemeljski trajni magneti;recikliranje;sintranje s plazmo;postopek difuzije meje zrn (GBDP);visoka magnetna koercivnost;
Vrsta dela (COBISS): Članek v reviji
Strani: f. 1-17
Letnik: ǂVol. ǂ13
Zvezek: ǂiss. ǂ16
Čas izdaje: Aug. 2020
DOI: 10.3390/ma13163528
ID: 14259054