摘要
本文采用表面活性剂辅助高能球磨技术获得纳米晶结构的Sm_2Fe_(17)片状粉体，实现了Sm_2Fe_(17)的低温(300-350℃)短时氮化，使其在300-350oC就能氮化形成Sm_2Fe_(17)N_3，并且所合成的Sm_2Fe_(17)N_3矫顽力为3.56kOe，还具有一定的织构，探讨了Sm_2Fe_(17)片的微观结构、磁性能及其低温氮化机理。采用表面活性剂辅助高能球磨技术制备了高各向异性、高磁性能SmCo_5纳米片和单晶Sm_2Co_(17)硬磁纳米颗粒，研究了表面活性剂的种类、含量、球磨工艺对纳米片和纳米颗粒结构和性能的影响。采用改进的机械化学工艺方法合成的矫顽力高达35.5kOe的Sm-Co硬磁纳米颗粒，通过低能球磨清洗后获得了矫顽力为23.7kOe、具有核/壳结构的SmCo_5/Sm_2O_3硬磁纳米颗粒，研究了影响Sm-Co纳米颗粒的粒径、相结构、微观结构和磁性能的各种因素。
In this paper, Sm_2Fe_(17)flakes have been synthesized by surfactant-assisted HEBM and werenitrided at lower temperature of300-350oC in a short time. The synthesized Sm_2Fe_(17)N_3flakes stillhave a texture and obtained a coercivity of3.56kOe. The microstructure, phase structure,properties and the nitrogenation mechanism at lower temperature of Sm_2Fe_(17)flakes has beendiscussed. SmCo_5nanoflakes and single-crystal hard magnetic Sm2Co17nanparticles have beenprepared by surfactant-assisted HEBM. The effect of the content and types of surfactants andmilling process on the formation of nanoflakes and nanoparticles has been investigated. Theseparated Sm-Co-based hard nanoparticles with a coercivity of35.5kOe have been prepared by amodified mechanochemical processing. The SmCo_5/Sm_2O_3hard magnetic nanoparticles withcore/shell structure have been obtained after low energy ball milling washing proces. The phases,microstructure, particle sizes and magnetic properties of the synthesized Sm-Co nanoparticleshave been investigated.
引文
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