高铬刚玉涂料及防粘砂机理研究

Investigation on High Chromium Corundum Coating and Its Resisting Burn-on Mechanism

试验了醇基高铬刚玉粉涂料并在铸钢生产中应用,采用电子探针分析了高温钢液作用过的涂层断面结构,探讨了其防粘砂机理。结果表明,这种涂料有较好的防粘砂效果;发现了钢液表面的FeO和砂型中的水玻璃向涂层中渗透,涂层中耐火骨料颗粒表面熔融,烧结成彼此相连的大块状,骨料间隙填充硅酸铝、铁、钠玻璃相,形成一定厚度的致密隔离层,有效地防止了钢液的渗透。

An alcohol base high chromium corundum coating was tested in the production of steel castings. The results show that the coating has good effect to resist burn-on in steel castings. A fracture of the coating layer attacked by high temperture molten steel was analyzed using electronic probes and the mechanism of resisting burn-on of this coating was investigated. It was found that FeO come from molten steel and sodium silicate in sand mould could penetrate into the coating layer at high temperature, the surface of the refractory particles in the coating were melt, sintered to form the large lumps that were adhered each other. The spaces within the particles were filled with the glass phase of alumina, ferrous-olivine, sodium silicate, and so on, thus causes the formation of a dense layer with a cartain thickness and can prevent penetration of molten steel into sand mould effectively.