【作者】 李林；

【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】 Sm-Fe-N系双相纳米复合永磁材料的面世后,以其优异的内禀磁性能,为磁性材料带来了新的活力。其硬磁性能与磁王NdFeB不相上下,居里温度更是有大幅度的提高,这为永磁材料的发展提供了令人乐观的前景。本试验采用熔体快淬法（甩带法）制备非晶薄带,并通过晶化、氮化等热处理工艺制备了Sm₃（Fe,M）₂₉N_x/α-Fe（M=Cr,V）磁粉。详细的研究了Sm₃（Fe,M）₂₉N_x/α-Fe（M=Cr,V）磁性材料的制备工艺、检测和分析方法。通过X射线衍射仪、扫描电子显微镜、透射电子显微镜、振动样品磁强计等实验仪器,采用先进的检测方法对合金制备工艺和磁粉的微结构以及磁性能进行了分析,着重研究了元素的微量添加对磁粉的微结构和磁性能影响。 试验按照理论成分Sm₃(Fe_26.5Cr₂V（0.5）)、Sm₃(Fe₂₆Cr₂V₁)、Sm₃(Fe_25.5Cr₂V_1.5)、Sm₃(Fe₂₅Cr₂V₂)配料,进行了母合金熔炼,并通过熔体快淬法制备了非晶合金薄带。通过对非晶薄带晶化和氮化,发现了一些合金添加量与合金磁性能关系的规律。 微量合金添加量不宜过多,在适量添加时(原子比小于3.3%,如Sm₃(Fe_26.5Cr₂V_0.5)、Sm₃(Fe₂₆Cr₂V₁))添加元素取代铁元素较好的稳定了Sm₃（Fe,M）₂₉相,发现了理想的相组成(Sm₃（Fe,M）₂₉+α-Fe)。同时,后期的熔体快淬得到了均匀的非晶,非晶晶化得到了尺寸一致的晶粒。并在最后的磁性能测量中,得到了远高于其他成分配比的合金的磁性能。而当元素添加量过多时(原子比大于3.3%,如Sm₃(Fe（25.5）Cr₂V_1.5)、Sm₃(Fe₂₅Cr₂V₂)),添加元素体现出了非常强烈的对铁元素的稳定作用,造成了α-Fe相大量增加。严重影响了合金的各种物理性能,造成了合金在熔体快淬时流动性极差,影响了快淬效果。并且造成了磁粉磁性能的降低。更多还原

【Abstract】 After the apearance of the nanocomposite permanet magnetic materials, with it’s perfect internal magnetism, it initiate a new power for the research of magnetic materials. The permanent magnetism is beyond the NdFeB, and the Curie temperature increased greatly, which provide optimistic foreground for the permanent materials. The amorphous band was perpared using the melt-spun method, and Sm₃（Fe,M）₂₉N_x/α-Fe （M=Cr,V） powders were carried out through the processing of crystalization and nitrification etc. The pocessing> detection and analysis method for Sm₃（Fe,M）₂₉N_x/α-Fe （M=Cr,V） magnetic materials were stuied detailedly. Adopting advanced detection method, author analysizes the microstructure and magnetic performance. The effect of addition element on microstructure and magnetic performance were stuied basically.The minor elements were added befittingly, while the atom rate of addition element is below the 3.3% such as Sm₃(Fe_26.5Cr₂V_0.5)> Sm₃(Fe₂₆Cr₂V₁), the minor elements were steady in Sm₃（Fe, M）₂₉ phase and the rate of Sm₃（Fe, M）₂₉ and α-Fe was perfect. So the homogeneous amorphous made out by the melt spun, then the unanimous amorphous alloy was carried out. The uniform grain was fabricated out by crystalization. We got an advanced magnetic performance far-beyond the alloy in other component. When the atom rate of addition element is beyond the 3.3% as Sm₃(Fe_25.5Cr₂V_1.5) 、 Sm₃(Fe₂₅Cr₂V₂), the added elements enhance α-Fe phase consumingly, and debase the liquidity acutely, thus depress the magnetic performace.更多还原