【作者】 吴瑞国；

【导师】 崔春翔；

【作者基本信息】 河北工业大学 ， 材料学， 2006， 硕士

【摘要】 (Nd,Dy)₂（Fe,Cu,Co,Nb）₁₄B/α-Fe双相纳米晶耦合永磁合金,由具有高磁各向异性的硬磁相（Nd,Dy）₂（Fe,Cu,Co,Nb）₁₄B和具有高饱和磁化强度的软磁相α-Fe在纳米尺度范围内复合而成,利用硬磁相与软磁相发生交换耦合作用,来提高材料的用磁性能,是一种新型的永磁合金。本文系统的采用研究了合金（Nd,Dy）₂（Fe,Cu,Co,Nb）₁₄B/α-Fe的制备工艺,合金元素的复合添加特别是Nb元素的含量对合金制备工艺及磁性能的影响。 实验研究了不同熔炼电流和熔炼时间对合金铸态组织的影响,并对不同成分配比的合金进行了扫描电子显微分析和X—射线衍射分析,确定并给出了稳定的合金熔炼的工艺参数。 通过对甩带后的合金的X射线衍射分析发现,四种不同成分的合金均具有良好的非晶形成能力。实验分析了合金中Nb元素的含量对晶化过程的影响,结果表明,合金(Nd_10.76Dy₁)(Fe_73.56Cu_0.8Co₈Nb_x)B_5.88（x=0,0.5,1.0,1.5）中随着含Nb量的增加晶化转变温度明显升高。 所制备合金中,合金(Nd_10.76Dy₁)(Fe_72.56Cu_0.8Co₈Nb（1.0）)B_5.88具有最好的综合磁性能Hci=6656.3Oe,Mr=62.559emu/g,Ms=103.07emu/g。更多还原

【Abstract】 (Nd_10.76Dy₁)(Fe_73.56-xCu_0.8Co₈Nb_x)B_5.88/α-Fe（x=0, 0.5, 1.0, 1.5）double phase nano-composite exchange-coupling hard magnet is a new candidate for permanent magnetic material. It is composed of the hard magnetic phase （Nd,Dy）₂（Fe,Cu,Co,Nb）₁₄B and the soft magnetic phase a-Fe in their nano scale to make the nano-composite exchange-coupling effect comes to work. In this paper, the preparation of （Nd,Dy）₂（Fe,Cu,Co,Nb）₁₄B/a-Fe is systematically studied. The influence of Nb to the crystallization process and its magnetic properties are discussed.During the preparation of the master alloy, the current and melting time are studied. According to the SEM and XRD test of the alloy with different compositions, the stable parameters for master alloy melting are given.According to the XRD analysis it is found all the four kind of alloys have excellent amorphous forming ability. It is also found that with the increase of the content of Nb, the temperature of (Nd_10.76Dy₁)(Fe_73.56-xCu_0.8Co₈Nb_x)B_5.88 （x=0, 0.5, 1.0, 1.5） for crystallization is increased.(Nd_10.76Dy₁)(Fe_72.56-xCu_0.8Co₈Nb_1.0)B_5.88/α-Fe has the best comprehensive magnetic properties with Hci=6656.3Oe, Mr =62.559emu/g and Ms=103.07emu/g.更多还原