Al_2O_3粉体添加对烧结钕铁硼磁体结构与磁性能的影响  

Influence of Al_2O_3 Powder Addition on Microstructure and Magnetic Properties of Sintered Nd-Fe-B Magnets

作　　者：陈金清[1] 段敏[1] 吴美浩 黎龙贵 黄亚祥 黄彬[1] 黄超[1] 

机构地区：[1]江西理工大学冶金与化学工程学院,江西赣州341000 [2]赣州市东磁稀土有限公司,江西赣州341000

出　　处：《有色金属工程》2016年第6期1-5,13,共6页Nonferrous Metals Engineering

摘　　要：研究了在磁体制备过程中添加Al_2O_3粉体对(PrNd)31(AlCoCuGaZr)1.55B0.98Fe合金磁体密度、微观结构和磁性能的影响。结果表明,随着Al_2O_3粉末添加量的增加,磁体密度和矫顽力都呈先上升后下降趋势,剩磁与最大磁能积缓慢下降。Al_2O_3粉末添加量为0.1%时,磁体密度提升0.01g/cm3,继续添加,磁体密度开始下降;当Al_2O_3添加量为0.2%时,磁体矫顽力显著提升(提高5%),综合磁性能最佳。显微组织分析结果表明,适量添加Al_2O_3可使磁体晶粒平均尺寸减小,能改善磁体显微组织,促进磁体致密化。此外,分布在晶界中的Al_2O_3/RE2O3能够钉扎晶界,细化晶粒,使晶粒尺寸均匀,提高磁体磁性能。Influences of Al2O3 addition in the grain boundary on the microstructure and magnetic properties of （PrNd）31 （AlCoCuGaZr）1.55B0.98Fe alloy was studied. The results show that the density and coercivity of the magnets increased at the beginning and then decreased within the increasing of Al2O3 addition, and radiate downward trend after a first rise, however Br and （BH）max slowly declined. When the amount of Al2O3 powder was 0. 1%, the density was improved 0.01 g/cm^3. It is found that the coercivity of magnet significantly increased （increasing by 5% ） with 0.2% Al2O3 addition, and the comprehensive magnetic properties were best. Microstructure observations show that adding of Al2O3 on the grain boundaries could decrease the grain average size, optimize the microstructure, and promote the densification of the magnet. In addition, Al2O3/ RE2O3 existing on the grain boundaries could pin grain boundaries, refine grain, and increase the coercivity of magnet.

关 键 词：AL2O3 烧结钕铁硼磁体 矫顽力 微观组织 磁性能 

分 类 号：TG132.2[一般工业技术—材料科学与工程] TM273[金属学及工艺—合金]