电脉冲退火对大块Nd_8Fe_(87.5)B_(4.5)纳米复合磁体性能的改善  

Improvement of Magnetic Properties in Bulk Nanocomposite Nd_8Fe_(87.5)B_(4.5) Magnets Prepared by Electropulsing Annealing

作　　者：刘开华[1,2] 张忠富[3,2] 杨武[2] 韩广兵[2] 高汝伟[2] 

机构地区：[1]深圳新能电力开发设计院,深圳518029 [2]山东大学物理学院,济南250100 [3]海工英派尔工程有限公司,青岛266061

出　　处：《金属功能材料》2010年第1期1-3,共3页Metallic Functional Materials

基　　金：国家自然科学基金资助项目(No:50801043;50671055)

摘　　要：用注射压铸方法制造了直径为1.0 mm的棒状Nd8Fe87.5B4.5纳米复合永磁体,分别用电脉冲和传统等温退火方法对样品进行了均匀热处理,并用X射线衍射(XRD)和透射电镜(TEM)分析了样品的微结构。结果发现,经电脉冲方法退火的样品晶粒尺寸比用传统等温炉退火更规则更均匀,使jHc和(BH)m分别提高16.5%和13.4%。Nd8Fe87.5B4.5 bulk nanocomposite permanent magnets, in the form of rods with diameter 1.0 mm, have been prepared by injection die casting and treated by electropulsing and conventional isothermal annealing. The mi- crostructures were studied by X-ray diffraction （XRD） and transmission electronic microscopy （TEM）. The grains of both a-Fe and Nd2 Fe14 B in samples annealed by electropulsing are more regular and uniform than that annealed by conventional isothermal furnace, which leads to the improvement of magnetic properties by 16.5% and 13.4% in i Hc and （BH）m, respectively.

关 键 词：纳米复合磁体 电脉冲退火 大块磁体 磁性能 

分 类 号：TM273[一般工业技术—材料科学与工程] TG132.2[电气工程—电工理论与新技术]