A coating for grain-oriented silicon steel coating layer, and grain-oriented silicon steel sheet and manufacturing method therefor

Abstract

The present disclosure relates to a coating, comprising a phosphate salt, a colloidal silica and a chromic acid compound, wherein the phosphate salt comprises magnesium dihydrogen phosphate and aluminum dihydrogen phosphate, and wherein a molar ratio of element Al to element Mg in the phosphate salt is 0.02 to 0.15. The present disclosure also relates to a grain-oriented silicon steel sheet, comprising: a substrate; and a coating layer on a surface of the substrate, wherein the coating layer is formed from the coating according to the present disclosure. The present disclosure further relates to a method for manufacturing a grain-oriented silicon steel sheet, comprising the steps of: applying the coating onto the surface of the substrate, and then performing a sintering treatment, wherein the substrate has a temperature, at which the sintering treatment is performed, of 800 to 880° C. The coating layer formed from the coating according to the present disclosure can impart higher tension and more excellent heat resistance to the grain-oriented silicon steel sheet, and has good promotion prospects and application effects.

Dependencies are inferred from the claim text.