【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。更多还原

【Abstract】 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 nm.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.更多还原