通过机械化学合成方法制备了矫顽力分别为2.95×106、2.83×106和8.60×105 A/m 的分散的单晶纳米 Sm2 Co7、SmCo5和 Sm2 Co17硬磁颗粒。研究了球磨时间、原料配比和退火工艺等对所制备的纳米永磁颗粒的微观组织、结构和磁性能的影响。结果表明,机械化学球磨时间至少是4h或更长时间才能获得Sm-Co硬磁合金粉末。原料经过高能球磨后、未退火时,由于大部分颗粒为非晶结构,矫顽力较低,随着退火温度的上升,矫顽力增大,当退火温度为600℃时,达到最大值为2.83×106A/m,然后,随着退火温度的进一步升高,矫顽力减小。Sm-Co 纳米颗粒的粒径随着退火温度的降低而明显减小。
Separated,single-crystal Sm2 Co7 ,SmCo5 and Sm2 Co17 hard magnetic nanoparticles with coercivities of 2.95×106 ,2.83×106 and 8.60×105 A/m have been fabricated by mechanochemcial sythesis.The influences of milling time,Sm/Co ratio of precursors and annealing process on the microstructures,phase structures and magnetic properties have been investigated.The results show that it was necessary that mechanochemical mill-ing time was 4 h or more to obtain Sm-Co hard magnetic powders.Maj ority of the milled powders without an-nealing were non-crystal and its coercivity was low.The coercivities of the synthesized powder increased with the increase of annealing temperature and reached a maximum of 2.83×106A/m when the annealing tempera-ture was 600 ℃.Then it decreased with further increasing the annealing temperature.The particle size of the synthesized Sm-Co nanoparticles decreased clearly with the decrease of annealing temperatures.
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