取向硅钢表面涂层结构对其性能的影响

Effect of the coating structure on the properties of grain-oriented silicon steel

通过扫描电镜观察取向硅钢截面涂层结构,分析其对取向硅钢绝缘性能、附着性、铁损的影响。研究结果表明:取向硅钢底层的钉扎、硅酸镁涂层、磷酸盐涂层共同作用影响着取向硅钢的性能;取向硅钢底层质量差会导致其绝缘性能和磁性能差;底层钉扎对铁损影响较大,钉扎厚度为3μm时,取向硅钢的铁损低且附着性好;硅酸镁涂层越致密均匀,取向硅钢的附着性越优良;钢板的底层厚度与磷酸盐涂层厚度同时影响着取向硅钢的绝缘性能,在相同的底层厚度下,提高磷酸盐涂层的厚度有利于提高钢板的层间电阻。

The cross sectional images of the grain-oriented silicon steel coating were observed by scanning electron microscope. The effects of the coating structure on the layer resistance, adhesion and iron loss of the steel were researched. The results showed that it was the combined reaction of the pinning layer, the magnesium coating and the phosphate coating that affected the properties of the steel. The poor quality of the glass film led to low insulation and magnetic property. The pinning layer had a great effect on the iron loss. When the pinning layer was 3 μm, the iron loss was low and had an excellent adhesion. The steel had a better adhesion when the magnesium coating was more uniform and compact. The combination of the thickness of glass film and phosphate coating affected the layer resistance of the steel. Under the same thickness of glass film, increasing the thickness of the phosphate coating could help improve the layer resistance of the steel.