放电等离子烧结Fe_3B/(Pr,Tb)_2Fe_(14)B块体纳米晶双相复合永磁体的性能  

Properties of Fe_3B/(Pr,Tb)_2Fe_(14)B Bulk Nanocomposite Magnets Prepared by Spark Plasma Sintering

作　　者：牛培利[1] 岳明[1] 张久兴[1] 张东涛[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3期497-499,共3页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50201001);北京市自然科学基金重点项目(2041001)资助

摘　　要：采用放电等离子烧结技术将非晶Pr4.2Tb0.3Fe78B17.5薄带制备成块状纳米晶复合磁体。研究了烧结条件对磁体密度、微观结构和磁性能的影响。结果表明,烧结温度的升高可使磁体得到高致密度,但同时由于其晶粒长大,结果导致磁性能的恶化。在最佳烧结条件下得到磁体的磁性能为Br=1.02T,JHc=220kA/m。磁体具有较好的微观结构,平均晶粒尺寸为20nm。Amorphous melt-spun ribbons of Pr4.2Tb0.3Fe78B17.5 alloy were consolidated into bulk nanocomposite magnets by Spark Plasma Sintering method. Effect of sintering conditions on the density, microstructure and magnetic properties were studied. Higher sintering temperature improved the densification of the magnets, while deteriorated their magnetic properties simultaneously due to the excess crystal grain growth. Magnet possessed a Br of 1.04 T and a JHc of 220 kA/m under the optimal sintering condition, and its microstructure contained satisfied grains with an average size of about 20 nm.

关 键 词：Fe3B/(Pr Tb)2Fe14B 块状纳米晶复合永磁体 放电等离子烧结 磁性能 

分 类 号：TB383.1[一般工业技术—材料科学与工程] TF125[冶金工程—粉末冶金]