锆对纳米复相粘结磁体的组织结构和磁性能的影响  

Effect of Zr Content on Microstructure and Magnetic Properties of Nanocomposite Bonded Magnets

作　　者：连利仙[1] 刘颖[1] 高升吉[1] 涂铭旌[1] 

机构地区：[1]四川大学材料科学与工程学院,四川成都610065

出　　处：《中国稀土学报》2004年第6期769-772,共4页Journal of the Chinese Society of Rare Earths

基　　金：国家863计划资助项目(2001AA324030);四川省杰出青年科技基金资助(03ZQ026-006)

摘　　要：采用快淬、热处理及模压成形工艺,制备了成分为Nd10.5Fe78.4-xCo5ZrxB6.1(x=0,1.0,1.5,2.0,2.5)的5种粘结永磁体。采用XRD,DTA,AFM等方法对合金的组织结构、晶化行为进行了研究。结果表明:Zr含量的增加可提高材料的非晶形成能力;当Zr添加到一定量时,形成高熔点的Fe2Zr相,产生细化晶粒的作用;添加Zr元素显著地提高了合金的矫顽力,改善了退磁曲线矩形度,从而提高了最大磁能积。Nd10.5Fe78.4-xCo5ZrxB6.1永磁体在x=2时获得最佳磁性能,Br=0.659T,Hcj=628kA·m-1,Hcb=419kA·m-1,(BH)m=73kJ·m-3。Five kinds of bonded magnets with the compositions of Nd_(10.5)Fe_(78.4-x)Co_5Zr_xB_(6.1) (atom percentage x=0, 1.0, 1.5, 2.0, 2.5) were prepared by rapidly quenching, post heat treatment and mould pressing. The microstructure and crystallization behavior were studied by X-ray diffraction (XRD), differential thermal analysis (DTA) and atomic force microscopy (AFM). The results suggest that high Zr concentration can increase the glass formation ability (GFA) of alloys. The Fe_2Zr with high melting point forms in the alloys, when the content of Zr is controlled at a certain amount, and it can reduce the grain size. The coercivity and the squareness of demagnetization loop are obviously improved by the addition of Zr, and the energy product is accordingly increased. As a result, the excellent magnetic properties with B_r=0.659 T, H_(cj)=628 kA·m^(-1), H_(cb)=419 (kA·m^(-1),) (BH)_m=73 kJ·m^(-3) are obtained in Nd_(10.5)Fe_(78.4-x)Co_5Zr_xB_(6.1) bonded magnet with x=2.

关 键 词：金属材料 锆 纳米复相磁体 组织 磁性能 稀土 

分 类 号：TM273[一般工业技术—材料科学与工程]