摘要
采用粉末冶金法在Sm(CobalFe0.1Cu0.1Zr0.033)7.5中掺入La3Co进行液相烧结,制备了(SmLa)(CoFeCuZr)z永磁体。研究了液相La3Co的添加量对Sm(CobalFe0.1Cu0.1Zr0.033)7.5永磁体的退磁曲线、剩磁、磁能积及矫顽力的影响,分析了磁体的高温矫顽力机理。结果表明:液相La3Co的加入,降低了Sm(CobalFe0.1Cu0.1Zr0.033)7.5合金中的z值,提高了磁体的退磁曲线方形度,随液相La3Co加入量的增加,磁体的饱和磁化强度、剩磁、磁能积及矫顽力逐渐降低;但另一方面La元素的加入降低了胞壁相和胞体相间的交换耦合作用,提高了永磁体的高温矫顽力,当液相La3Co的加入量为3%时,磁体高温500℃矫顽力达到0.9 T。
Sm(CobalFe0.1Cu0.1Zr0.033)7.5 permanent magnets was prepared by powder metallurgy method with an addition of liquid phase La3Co.The effects of La3Co addition on the demagnetization curve,remanence,coercivity and mechanism of high temperature coercivity of Sm(CobalFe0.1Cu0.1Zr0.033)7.5 permanent magnets were studied.It was found that demagnetization curve was improved with La3Co addition,due to the change of cell structure in the magnets.As the addition of La3Co comes to 3%,the magnet achieves the best demagnetization curve,while as the addition of La3Co comes to 5%,the demagnetization curve becomes deviation again.Remanence and magnetic energy product,which are intrinsic magnetic properties for the magnetic materials,decreased with La3Co addition account to the La element is a non-magnetic element.The coercivity at room temperature decreased with the addition of La3Co increasing,which account to the 1:5 cell boundary phase volume fractions increase.Coercivity mechanism of the precipitation-hardened Sm(CobalFe0.1Cu0.1Zr0.033)7.5 high-temperature magnets was described by the theory of single-phase permanent magnets.The addition of La3Co reduce the exchange coupling between the cell body and improve the coercivity in high temperature of permanent magnet,when the addition of La3Co come to 3%,the coercivity of the magnets at high temperature 500℃reaches 0.9 T.
作者
郭海勇
王光建
GUO Hai-yong;WANG Guang-jian(Handan Iron&Steel Group Equipment Manufacturing and Installation Co.LTD,Handan 056015,China;School of Mathematical Science and Engineering,Hebei University of Engineering,Handan 056038,China)
出处
《功能材料与器件学报》
CAS
2020年第5期344-349,共6页
Journal of Functional Materials and Devices
基金
河北省博士后科研项目择优资助基金项目(B2014003019)
关键词
永磁体
液相烧结
剩磁
磁能积
矫顽力
高温
Permanent magnets
Liquid phase sintering
Remanence
Magnetic energy
Coercivity
High temperature
