分散的Sm-Co永磁纳米颗粒的机械化学合成及磁性能  

Mechanochemical synthesis and magnetic properties of separated Sm-Co permanent magnetic nanoparticles

作　　者：赵立新[1,2] 孟国营[2] 郑立允[1,3] 

机构地区：[1]河北工程大学机电学院,河北邯郸056038 [2]中国矿业大学(北京)机电与信息工程学院,北京100083 [3]钢铁研究总院功能材料研究所,北京100081

出　　处：《功能材料》2013年第18期2715-2718,2723,共5页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(51271060);北京市自然科学基金资助项目(2132059);河北省杰出青年科学基金资助项目(E2013402051);河北省重点基础研究资助项目(13961003D)

摘　　要：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Sm2Co7、SmCo5和Sm2Co17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2.83×106 A/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 Sm2Co7, SmCo5 and Sm2Co17 hard magnetic nanoparticles with coercivities of 2.95×10^6、2.83×10^6 and 8.60×10^5A/m have been fabricated by mechanochemcial sythesis. The influences of milling time, Sin/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. Majority 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 2.83×10^6A/m when the annealing temperature 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.

关 键 词：机械化学合成制备 纳米颗粒 磁性能 Sm—Co合金 

分 类 号：TB34[一般工业技术—材料科学与工程]