以普通硅钢和硅铁合金为原料，采用包覆浇铸法制备具有三层结构的高硅电工钢铸坯，之后结合传统的轧制工艺和扩散退火工艺获得了6.5% Si电工钢复合板，利用光学显微镜和扫描电镜研究了其显微组织和硅元素的分布，并对其磁性能进行了测试。结果表明：采用上述工艺方法成功制备出了0.5 mm厚的电工钢复合板；经1 200℃×75 min扩散退火后，电工钢复合板中的硅元素发生了完全扩散，复合板由三层结构变成单层结构，整体硅元素质量分数约为6.5%；6.5% Si电工钢复合板的铁损P_1.5/50为2.68~2.72 W·kg^-1，磁感应强度B₈为1.370~1.378 T、B₅₀为1.610~1.625 T；与0.34 mm厚的Fe-6.5% Si合金相比，复合技术制备的6.5% Si电工钢复合板的磁感应强度较高，但铁损也略高。

High silicon electrical steel ingot with three-layer structure was prepared by clad casting using common silicon steel and silicon ferrosilicon alloy, then 6.5%Si electrical steel composite plate was obtained by traditional rolling process and diffusion annealing process. Microstructure and Si element distribution were studied by optical microscope and scanning electrical microscope. Magnetic properties were also tested. The results show that electrical steel composite plate with 0.5 mm thickness could be prepared by this method successfully. After 1 200℃×75 min diffusion annealing treatment, Si element diffused completely and three layers of composite plate was changed into single layer gradually, while the content of Si element was about 6.5wt.%. The value of iron loss P_1.5/50 was 2.68-2.72 W·kg^-1 and the values of magnetic induction B₈ was 1.370-1.378 T, B₅₀ was 1.610-1.625 T for 6.5%Si electrical steel composite plate. Compared with Fe-6.5%Si alloy whose thickness was 0.34 mm, 6.5%Si electrical steel composite plate prepared by this method had a higher magnetic induction but greater iron loss.