The effect of the chemical composition of the alloys on the magnetic properties of sintered Sm – Co – Fe – Cu – Zr magnets produced with mixing of alloy powders is studied. Elevation of (BH )_max of Sm – Co – Fe – Cu – Zr magnets due to increase of the concentration of Fe to 20 wt.% requires observation of a strict proportion of the components and precision choice of the modes of heat treatment. Optimization of the chemical composition and use of step annealing with reduction of the temperature from 700 to 400°C has given sintered magnets with the following properties: B_r = 11.7 – 11.9 kGs, H_cB = 9 – 10 kOe, H_cJ = 15 – 20 kOe, and (BH )_max = 29 – 31 MGs · Oe.

研究了合金化学成分对混合合金粉制备的Sm-Co-Fe-Cu-Zr烧结磁体磁性能的影响。由于Fe的浓度增加到20 wt。％，Sm – Co – Fe – Cu – Zr磁体的（BH）_max升高需要观察到严格的成分比例并需要精确选择热处理方式。通过优化化学成分和将温度从700°C降至400°C进行逐步退火，烧结磁铁具有以下性能：B _r = 11.7 – 11.9 kGs，H _{c B} = 9 – 10 kOe，H _{c J} = 15 – 20 kOe，并且（BH）_max = 29 – 31 MGs·Oe。