取向硅钢底层结构对表层附着性的影响

Effect of under-layer structure on surface adhesiveness of oriented silicon steel

通过对附着性较好和附着性较差的取向硅钢的微观形貌和成分分布进行对比,研究了取向硅钢的底层结构对附着性的影响.结果表明:取向硅钢底层主要分为绝缘涂层和硅酸镁玻璃层(部分硅酸镁底层深入基体形成钉扎),硅酸镁玻璃层和磷酸盐绝缘涂层没有明显的过渡层以及相互融合的区域;取向硅钢附着力的主要来源应为硅酸镁底层与钢基之间的机械作用,附着性的好坏主要由硅酸镁底层的结构来决定;良好的附着性需要致密的硅酸镁底层并且搭配大颗粒的钉扎,钉扎分布的位置靠近硅酸镁底层,形成"半岛状"钉扎.底层中镁铝尖晶石应分布在钉扎中.

The effects of the under-layer structure of oriented silicon steel on adhesiveness were studied by comparing the microstructure and composition distribution of oriented silicon steel with better adhesiveness and poorer one.The results showed that the under-layer is mainly divided into phosphate insulating coating and magnesium silicate under-layer(partial magnesium silicate bottom layer is formed into the base material to form pinning),which have no obvious transition layer and fusion area.The main source of adhesive force of oriented silicon steel should be the mechanical action between the magnesium silicate under-layer and the steel base,and the adhesive force is mainly determined by the structure of the magnesium silicate under-layer.Good adhesiveness requires dense a magnesium silicate under-layer with a large pinning particles closing to the bottom layer of magnesium silicate and forming a"peninsula".The magnesium-aluminum spinel in the bottom layer should be distributed into the pinning.