硬磁/软磁纳米复合颗粒的声化学制备  

Fabrication of Hard/Soft Nanocomposite Magnetic Particles by Sonochemistry

作　　者：李保卫[1] 李永利[1] 张久兴[1] 

机构地区：[1]北京工业大学新型功能材料教育部重点实验室,北京100022

出　　处：《稀有金属材料与工程》2007年第8期1457-1460,共4页Rare Metal Materials and Engineering

基　　金：北京市自然科学基金重点项目(2041001);北京工业大学青年科学基金(97009011200501);北京工业大学博士科研启动金(52009011200401)

摘　　要：利用超声波使金属有机化合物Fe(CO)5在低温和惰性气氛环境中分解生成纳米尺寸Fe颗粒,并使其包覆在硬磁颗粒表面,制备出Sm-Fe-N/Fe和Nd-Fe-B/Fe纳米复合粉末。透射电子显微镜及能谱分析表明,Fe(CO)5声化学分解得到了纯净的Fe颗粒,其尺寸约为5nm;运用场发射扫描电子显微镜对包覆产物的显微形貌进行了观察,结果显示Fe在两种永磁颗粒表面可以实现均匀包覆,且包覆的Fe含量可调;能谱分析表明,超声化学包覆过程中未生成其他副产物。此外,讨论了纳米Fe颗粒的包覆制备工艺条件和机制。Sm-Fe-N/Fe and Nd-Fe-B/Fe nanocomposite magnetic powders were successfully prepared by the use of sonochemistry to decompose the carbonyl iron compounds in decane solvents containing Sm-Fe-N and Nd-Fe-B powders at low temperature and in an inert atmosphere, respectively. The TEM observations and the corresponding EDS analysis show that the small nano-iron by sonochemical process are pure with a particle size of about 5 rim. The SEM observations indicate that the Sm-Fe-N and Nd-Fe-B powders are well coated by nano-sized Fe. The content coating Fe can be easily adjusted by controlling the carbonyl iron and the related sonochemical process. In addition, the preparation conditions and mechanism of coating process were discussed.

关 键 词：声化学 包覆 羰基铁 纳米复合磁性材料 钐-铁-氮 钕-铁-硼 

分 类 号：TM271[一般工业技术—材料科学与工程]