Abstract: Insulation performance is an important index of oriented silicon steel. The effects of the coating sintering temperature, the silica sol content in coating solution and the coating amount on the insulation property of the oriented silicon steel were studied in this paper. And the research indicated: As the sintering temperature increases, microscopic cracks gradually appear on the coating surface. After the annealing temperature reaches 900 ℃, the coating surface cracks will increase sharply and lead to the decrease of the coating insulation. At the same sintering temperature, increasing the content of SiO2 in the coating solution will lead to micro-cracks on the coating surface, which is not conductive to the insulation performance of the coating. At the same sintering temperature, increasing the coating amount is beneficial to increasing the interlayer resistance of the steel plate. When the sintering temperature is 850 ℃ and the coating amount is 6 g/m2, the interlayer resistance of the steel plate can reach 82.6 Ω·cm2.

Key words: oriented silicon steel, insulation property, microcracks, sintering temperature