超细铁钴合金粉末微结构及其磁性能研究  

Microstructures and Magnetic Properties of Ultrafine Fe-Co Powders Prepared by Chemical Reduction Process

作　　者：朱虹[1] 杨志民[1] 杜军[1] 

机构地区：[1]北京有色金属研究总院先进电子材料研究所,北京100088

出　　处：《稀有金属》2008年第3期289-293,共5页Chinese Journal of Rare Metals

基　　金：北京有色金属研究总院青年基金资助项目

摘　　要：采用液相还原法,通过控制颗粒的生长条件,制备了不同成分、不同尺寸的Fe-Co合金粉末颗粒,研究了不同生长条件得到的合金颗粒微结构及形状等对其磁性能的影响。结果表明:当钴的质量分数小于等于70%时,合金晶体为单一BCC结构,当钴含量为90%时,合金晶体为FCC与HCP的混合结构;随着制备温度的升高,得到的合金粉末的粒径逐渐减小;粉末颗粒的比饱和磁化强度的变化规律与块体材料相同,但是由于表面氧化层的存在,使得合金粉末颗粒的比饱和磁化强度低于块体值。Ultrafine Fe1-x Cox=O. 1, 0.35, 0.5, 0.7, powders with the value 0.9 were prepared by chemical reduction process. The influences of reduction conditions on the microstructures and magnetic properties were studied. X-ray diffraction （XRD） data showed that the alloy powders had single bcc phase ex- cept for the samples with x = 0.9, which consisted of fcc and hcp phases. SEM results showed that the par-ticle size of Fe-Co alloy powders decreased with a rise in the reduction temperature. Magnetic hysteresis loop results showed that the change of the specific saturation magnetization of ultrafine Fe1-x Co. powders was the same with that of bulk materials. But the specific saturation magnetizations of uhrafine powders were slightly lower than that of bulk material in value because of surface oxidation of the powders.

关 键 词：液相还原法 铁钴合金 磁性能 

分 类 号：TQ138.1[化学工程—无机化工]