High coercivities in HDDR processed Sm-Fe-Ta-N magnets = Visoke koercitivnosti Sm-Fe-Ta-N magnetov dobljenih po HDDR postopku
Žužek Rožman, Kristina ; McGuiness, Paul J. ; Kobe, Spomenka
An alloy of composition ▫$Sm_{13,8}Fe_{82,2}Ta_{4,0}$▫ was compared with a conventional ▫$Sm_{13,7}Fe_{86,3}$▫ material in order to assess its potential as a permanent magnet mataerial. The optimum ...conditions necessary to provide the highest coercivities using the HDDR process and for the HDDR process combined with milling were investigated. The coercitivities obtained after using the HDDR process and subsequent nitriding were 676,6 kA/m for the ▫$Sm_{13,8}Fe_{82,2}Ta_{4,0}N_x$▫ and 358,2 kA/m for the ▫$Sm_{13,8}Fe_{86,3}N_x$▫ samples. Coercivities of 1003,0 kA/m for ▫$Sm_{13,8}Fe_{86,3}N_x$▫ and 1273,6 kA/m ▫$Sm_{13,8}Fe_{82,2Ta_{4,0}N_x$▫ were achieved by reducing the paraticle size with milling prior to the HDDR process. Magnetic results were comparedwith the phase composition, determined using scanning electron microscopy (SEM) and X-ray diffraction (XRD). The better coercivities obtained with the Ta containing sample were found to be due to the presence of a much smaller amount of ▫$\alpha$▫Fe, a soft magnetic phase, with the ▫$TaFe_2$▫ phase forming in its place. The milling prior to the HDDR treatment improves the magnetic properties because of the small particle size which prevents the grains growing too laarge, with their consequent very negative effect on the coercivity.
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