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研究了烧结NdFeB磁体晶间复合添加Cu和Ti对磁体显微组织和磁性能的影响。当钛含量小于 1 2 %时 ,Cu和Ti晶间复合添加可大幅度提高烧结NdFeB磁体的矫顽力 ,剩磁变化不大。矫顽力的提高归因于Cu和Ti在主相晶粒表面富集 ,细化晶粒 ,阻断主相晶粒之间的磁交换作用 ,阻碍反磁化畴的传播。当钛含量大于 1 2 %时 ,矫顽力略有下降 ,剩磁急剧下降。剩磁下降的原因在于出现了大量的条状纯钛相。与晶间单独合金化相比 ,晶间复合合金化可更有效改善NdFeB磁体显微组织与性能。
The effect of adding Cu and Ti on the microstructure and magnetic properties of the sintered NdFeB magnets was studied. When the content of titanium is less than 12%, the co-addition of Cu and Ti can greatly increase the coercivity of the sintered NdFeB magnet, and the remanence does not change much. The improvement of coercivity is attributed to the enrichment of Cu and Ti on the grain surface of the main phase, grain refinement, blocking of the magnetic exchange between the grains of the main phase and impeding the propagation of the diamagnetic domains. When the content of Ti is more than 12%, the coercive force slightly decreases and the remanence decreases sharply. Remaining magnetic decline is due to the emergence of a large number of pure titanium phase. The intergranular alloying can improve the microstructure and properties of NdFeB magnets more effectively than the intergranular alloying.