外磁场下制备形状各向异性的Sm_2Co_(17)纳米薄片

Preparation of Nanoscale Flake-Shape Anisotropy Sm_2Co_(17) Under External Magnetic Field

利用球磨工艺,制备得到纳米晶稀土永磁Sm2Co17薄片,并研究球磨过程中外磁场的加入对Sm2Co17薄片成型过程、磁粉各向异性等的影响作用.实验中利用heptane溶剂和油酸活化剂对Sm2Co17粉粒表面进行活化处理,并在磁感应强度为0.5～2 T的外磁场下对粉粒球磨1～6 h,制备出片状结构的纳米晶Sm2Co17合金.通过X射线衍射、扫描电镜和超导量子干涉仪等测试分析得出,在外磁场作用下,Sm2Co17微观结构中更易形成取向一致的薄片形貌,与无磁场作用的颗粒比较,其表现出明显的各向异性且形状规则的空间排列状态.

The nanocrystalline Sm2Co17 flakes were prepared by high-energy milling,and the effects of the external magnetic field on the preparation process and anisotropy of nanocrystalline Sm2Co17 flakes were studied.In the experiment,the Sm2Co17 powder particle surface was activated with heptane and oleic acid and milled for 1~6 h under the magnetic field intensity of 0.5~2 T,thus nanocrystalline Sm2Co17 flakes were fabricated.By means of X-ray diffraction（XRD）,scanning electron microscopy（SEM）and superconducting quantum interference device（SQUID）,it is shown that the Sm2Co17 flakes prepared under the external magnetic field tend to form oriented flake morphology and present obvious anisotropic and textured morphology compared with those without the external magnetic field.