纳米Al掺杂对烧结Nd-Fe-B结构与性能的影响  

Effect of Al nanoparticles doping on the structure and properties of sintered Nd-Fe-B

作　　者：曹玉杰 张鹏杰 孙威 徐光青[4] 王继全 王倩 李青华[2,3] 吴玉程 缪冰锋[5] 阚绪材[6] CAO Yujie;ZHANG Pengjie;SUN Wei;XU Guangqing;WANG Jiquan;WANG Qian;LI Qinghua;WU Yucheng;MIAO Bingfeng;KAN Xucai(BGRIMM Technology Group,Beijing 100160,China;BGRIMM Magnetic Materials and Technology(Fuyang)Co.Ltd.,Fuyang 236000,Anhui,China;National Engineering Research Center for Magnetic Materials,Beijing 102600,China;School of Materials Science and Engineering,Hefei University of Technology,Hefei 230009,Anhui,China;School of Physics,Nanjing University,Nanjing 210008,China;School of Materials Science and Engineering,Anhui University,Hefei 230039,Anhui,China)

机构地区：[1]矿冶科技集团有限公司,北京100160 [2]北矿磁材(阜阳)有限公司,安徽阜阳236000 [3]国家磁性材料工程技术研究中心,北京102600 [4]合肥工业大学材料科学与工程学院,安徽合肥230009 [5]南京大学物理学院,南京210008 [6]安徽大学材料科学与工程学院,安徽合肥230039

出　　处：《矿冶》2023年第4期72-76,共5页Mining And Metallurgy

基　　金：国家重点研发计划项目(2021YFB3502400);安徽省重点研究与开发计划项目(006123115012);安徽省博士后研究人员科研活动经费资助项目(2022B637)。

摘　　要：采用晶间掺杂方法将不同含量的纳米Al加入钕铁硼细粉中,制备出不同纳米Al掺杂量的烧结钕铁硼磁体。系统研究了纳米Al的掺杂对烧结钕铁硼磁体微观结构、磁性能和温度稳定性的影响。结果表明:纳米Al的掺杂可以明显提高磁体的矫顽力,其矫顽力由未掺杂纳米Al时的8.91 kOe提高到掺杂0.8%纳米Al时的12.34 kOe,但纳米Al的掺杂也会导致磁体的剩磁和磁能积的降低。纳米Al的掺杂能够改善磁体的温度稳定性。由于纳米Al的熔点低,通过掺杂纳米Al既有助于烧结磁体的液相烧结促进其致密化,又能减少块状富稀土相,增加薄片状富稀土相,起到去磁耦合作用,对于烧结磁体的磁硬化具有重要作用。Sintered NdFeB magnets with different nano Al doping content were prepared by adding different nano Al into NdFeB fine powder by intergranular doping method.The effects of nano Al doping on the microstructure,magnetic properties and temperature stability of sintered NdFeB magnets were systematically studied.Results show that the coercivity of the magnets can be significantly improved by doping nano Al.The coercivity increases from 8.91 kOe when undoped nano Al to 12.34 kOe when doped with 0.8%nano Al.However,the doping of nano Al can also reduce the remanence and magnetic energy product of the magnets.The doping of nano Al can improve the temperature stability of the magnets.Due to the low melting point of nano Al,doping nano Al can not only help the liquid phase sintering of sintered magnets and promote its densification,but also reduce the massive rare earth rich phases and increase the lamellar rare earth rich phases,which plays a demagnetizing coupling role and an important role in the magnetic hardening of sintered magnets.

关 键 词：烧结ND-FE-B 纳米AL 晶间掺杂 磁性能 温度稳定性 

分 类 号：TM277[一般工业技术—材料科学与工程]