廉价R-Fe-B系烧结永磁材料的制备

为了综合利用我国稀土资源,降低Nd—Fe—B永磁合金的成本,研究了廉价(Nd、Pr)—Fe—B和(Ce、Nd、Pr)—Fe—B永磁材料的化学成分,制造工艺与磁性能的关系及其变化规律。添加Al可以大幅度提高合金的矫顽力。(Nd、Pr)—Fe—B合金最佳磁性能:Br=1.25T,M_Hc=714.3kA/m,(BH)_(max)=297.5kJ/m~3。(Nd、Pr)_(1-y)Ce_y—Fe—B合金的磁性能随Ce含量增加而降低。研究测定了合金的居里温度609～590K,剩磁可逆温度系数-0.094～-0.119％/K。观察分析了合金的显微组织,并测定了合金的密度,硬度及电阻率。

The Study of Cheap R-Fe-B Syetem Sintered Permanent Magnetic Materials

For comprehensive utilization of the rare earth resources in our puntry and to decrease the cost of Nd FeB magnets, the relationshi s between the magnetic properties and composition, processing of the cheap R-Fe-B system permanent magnets have been studied in this paper (R = Pr + Nd, or R = Ce + Pr + Nd). By addition of Al, the coercivity of alloy increases.The optimum magnetic properties of (NdPr)-Fe-B alloy are. Br = 1.25T.MHc = 714.3kA/m,(BH)m = 297.2kJ/m3.The magnetic properties of (PrNd)1-y Cey-Fe-B alloy(y = 0-0,5)decrease with increasing Ce content. The magnetic properties are as follows: Br=1.25T, MHc = 825.4 kA/m, ( BH)m = 297.5kJ/m3 for the alloy of y = 0.03; Br=1.20T, MHc = 563.6kA/m, ( BH ) m = 246kJ/m3 for the alloy of y = 0.3, Br=1.13T, MHc = 492kA/m, ( BH ) =222.2kJ/m3 for the alloy of y = 0.4; ( BH ) = 174.6kJ/m3 for the alloy of y = 0.5. The curie temperature of the alloys is about 609-590K. The reversible temperature coefficient of residual induction is about-0.094-- 0.119%/K, The microstructure, density, hardness, specific resistivity of the alloys have been observed and measured respectively.