高性能各向异性NdFeB磁粉研究  

Investigation of Anisotropic NdFeB Magnetic Powders with High Properties

作　　者：尤俊华[1] 连法增[1] 李庆达[1] 

机构地区：[1]东北大学材料与冶金学院,辽宁沈阳110004

出　　处：《郑州大学学报（工学版）》2009年第1期139-143,共5页Journal of Zhengzhou University（Engineering Science）

基　　金：国家科技攻关资助项目(2004BA310A51-1)

摘　　要：研究了d-HDDR工艺中歧化氢压、脱氢再复合温度、脱氢再复合真空度及添加合金元素Co对Nd12.5Fe80.4-xCoxGa0.5Zr0.1B6.5(x=0,4,8,12,15,17,20)合金磁性能的影响规律.通过X射线衍射仪(XRD)对磁粉的相结构进行表征.结果表明:d-HDDR工艺中,合金的相变过程为:Nd2(Fe,Co)14B+2H2<=>2NdH2+12 a-(Fe,Co)+(Fe,Co)2B;低于0.025 MPa的歧化氢压是NdFeB磁粉产生磁各向异性的关键,脱氢再复合阶段采用高温,低真空与高真空相结合的制度是NdFeB磁粉获得高各向异性的保证;歧化氢压为0.025 MPa,脱氢再复合温度为840℃时,磁粉各向异性DOA值为0.74;添加合金元素Co有益于提高磁粉的矫顽力和各向异性,Co含量为15 at%(原子分数)时,经最佳处理工艺,合金获得较高综合磁性能:DOA=0.62,Br=1.27T,jHc=754.3 kA/m,(BH)m ax=245.7 kJ/m3.The investigation focuses on the effects of disproportionation hydrogen pressure,desorption-recombination temperature,desorption-recombination vacuum and element Co on magnetic properties of Nd12.5Fe80.4-xCoSx Ga0.5 Zr0.1B6.5(x=0,4,8,12,15,17,20) alloys.The phase structure was characterized by X-ray diffraction(XRD).The results indicate that: the reactions[Nd2(Fe,Co)14B+2H2<=>2NdH2+12α-(Fe,Co)+(Fe,Co)2B] occur in the d-HDDR process;disproportionation hydrogen pressure below 0.025 Mpa is the key to spu...

关 键 词：d-HDDR 各向异性 NDFEB 磁粉 

分 类 号：TM273[一般工业技术—材料科学与工程]