磁粉粒度对2:17型Sm-Co烧结磁体性能及微结构的影响  

Effect of powder size on magnetic properties and microstructures of sintered 2:17-type SmCo magnet

作　　者：张文臣[1] 方以坤[1] 朱明刚[1] 赵睿[1] 王景代[1] 

机构地区：[1]钢铁研究总院功能材料研究所,北京100081

出　　处：《功能材料》2011年第3期498-500,504,共4页Journal of Functional Materials

基　　金：国家重点基础研究发展计划(973计划)资助项目(2010CB934600);国家自然科学基金资助项目(50871032;50901021)

摘　　要：通过粉末冶金工艺制备了高剩磁2:17型Sm-Co永磁材料,系统地研究了磁粉平均粒度对磁体性能和微结构的影响。随着球磨时间的延长,磁粉的平均粒度D由6.2μm逐渐减小到4.3μm,烧结磁体的平均晶粒尺寸从约80μm减小到约30μm,磁体中的氧含量明显增加。当D在5.0～6.0μm范围时,烧结磁体的综合性能较好,特别是在D=5.7μm时,磁体具有最佳的磁性能:Br=1.16T,Hcj>2069.6kA/m和(BH)m=231.6kJ/m3。2：17-type SmCo sintered permanent magnets with high remanence were prepared by powder metallurgy technology.The effect of average powder size D on their magnetic properties and microstructures has been investigated.With increasing the ball milling time from 30 to 80min,the obtained average powder sizes decrease from 6.2 to 4.3μm.It is found that the average grain sizes of the corresponding final sintered magnets vary from about 80 to 30μm,giving rise to the increasing of the content of oxygen significantly.Optimum magnetic properties occur for the sintered magnets when the D is located in the range of 5-6μm.In special,the best magnetic properties,Br=1.16T,Hcj2069.6kA/m,and（BH）m=231.6kJ/m3 were obtained at D=5.7μm.

关 键 词：2:17型Sm-Co烧结磁体 磁粉粒度 氧含量 磁性能 

分 类 号：TM273[一般工业技术—材料科学与工程]