中文摘要：

采用SC工艺制备了Nd-Fe-B合金铸片,研究了在合金铸片中添加Dy、Nb元素对合金铸片显微结构和烧结Nd-Fe-B磁体磁性能的影响,确定了Nd-Fe-B磁体获得最佳磁性能时Dy元素、Nb元素的含量,并用扫描电镜、磁性能测量仪等对其进行了分析和测量。实验结果表明,Dy元素的添加可以使晶粒细小化、均匀化、规则化,在不显著影响剩磁的情况下大幅度提高磁体的内禀矫顽力;在含Dy元素和Co元素的磁体中加入少量Nb元素可以在不显著影响剩磁的情况下较大幅度提高磁体的内禀矫顽力,降低磁通不可逆损失,提高磁体使用温度。

英文摘要：

Nd-Fe-B alloy films were fabricated by SC process,the microstructure and magnetic properties of the sintered Nd-Fe-B magnets with addition of Dy and Nb have been studied,and the best content of Dy and Nb was determined.The microstructure and magnetic properties of the magnets were analyzed and measured with the scanning electron microscope and NIM-10000 system,respectively.The results show that addition of Dy resulted in uniformly distributed,fined grained and regularly shaped microstructures and made Hcj increase significantly without reducing remanence obviously.Addition of Nb can increase Hcj,and decrease irreversible loss of flux.As a result,the magnetic properties at higher temperature are improved.