放电等离子烧结NdFeB磁体的富稀土相与矫顽力  

RE-rich Phase and Coercivity of SPSed NdFeB Magnets

作　　者：王公平[1] 李文波[1] 刘卫强[2] 岳明[2] 张久兴[2] 

机构地区：[1]江西师范大学,江西南昌330022 [2]北京工业大学,北京100022

出　　处：《稀有金属材料与工程》2012年第6期1116-1118,共3页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50371002);江西师大博士启动基金(1886);江西省教育厅2008年重点科技项目(2284)

摘　　要：利用放电等离子烧结技术(SPS)制备新型烧结磁体SPS NdFeB。为了更好理解磁体的磁性能,尤其是矫顽力和微组织关系的机理,本研究以热处理前后的SPS NdFeB为研究对象,利用扫描电镜(SEM)、高分辨透射电镜(HRTEM)、X射线能谱仪,B-H回线仪分别对磁体的显微组织和高分辨透射电镜像组织和磁性能进行了系统研究。结果表明,经过热处理后,磁体矫顽力明显提高,富稀土相的铁原子与稀土原子比Fe/Re明显下降;富稀土相结构形态发生明显变化,由热处理前的非晶态变为热处理后的晶态。A novel Nd-Fe-B based permanent magnets named as SPSed NdFeB magnets were prepared by spark plasma sintering （SPS） technique. In order to better comprehend the mechanism of the changes in magnetic properties of the SPSed NdFeB magnets treated in an optimized process, the effects of the heat treatment process on the microstructure of magnets were systematically studied by scanning electron microscopy （SEM）, energy dispersive X-ray spectroscopy （EDXS）, high-resolution transmission electron microscopy （HRTEM）, respectively. The results show that the increase in coercivity of the magnet is related to the obvious decrease in ratio of Fe to RE （Fe/Re） in Re-rich phase, and the RE-rich phase transforms to crystalline state from amorphous state after heat treatment process.

关 键 词：放电等离子烧结 钕铁硼 矫顽力 

分 类 号：TM273[一般工业技术—材料科学与工程]