NdFeB磁粉表面电沉积包覆纳米金属层研究  

Nanometals Electrodeposition on NdFeB Magnetic Powders

作　　者：姜力强[1] 陈巧玲[1] 郑精武[1] 盛嘉伟[1] 

机构地区：[1]浙江工业大学化工材料学院,浙江杭州310014

出　　处：《高校化学工程学报》2006年第3期433-436,共4页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金(5004005)。

摘　　要：在NdFeB磁粉表面包覆金属层是改变其性质的有效手段,但目前常用的化学沉积法、电化学沉积法与化学气相沉积法等都无法实现磁粉表面完整、牢固的包覆。探索新的NdFeB磁粉表面金属完整包覆技术具有重要的理论意义及应用价值。根据NdFeB片状磁粉在磁场下的磁化特征,设计了磁力搅拌流化床电解槽,利用电沉积实现磁粉表面的纳米金属层包覆。测量了磁粉包覆前后的磁性能和电极电位,测定了包覆不同厚度Cu对磁粉制成粘结磁体抗压强度的影响。结果表明,利用磁力搅拌流化床电沉积法可以实现NdFeB磁粉的完全包覆,包覆层厚度可以控制在纳米尺度。磁粉包覆后的磁性能和电极电位发生了明显改变,包覆铜样品的粘结磁体抗压强度明显提高。Surface coating with metals usually changes the properties of permanent NdFeB magnetic powders. In general, using the widely applied chemical or electronic deposition and chemical vapor deposition methods can not get a tight and complete coating. Thus, finding a new metal coating method is of great interest for both theoretical study and application. According to the magnetization behavior of the flaked NdFeB magnetic powders under magnetic field, a special magnetic force agitating fluid bed electrobath was designed to conduct the metals eleetrodaposition, through which the NdFeB powders can completely be coated with metals in the thickness of nanometer. The magnetic properties and electrode potential of the magnetic powders before and after electrodeposition were determined, and the results show that the magnetic and electrochemical properties of the powders change greatly alter being eleetrodeposited. The compress strength of the bonded magnet prepared with Cu-plated NdFeB magnetic powders increases with increasing of the Cu-plated layer thickness.

关 键 词：磁力搅拌流化床 电沉积 NDFEB磁粉 纳米金属层 

分 类 号：TM274[一般工业技术—材料科学与工程]