Low-noise oriented silicon steel with high-tension isolating bottom layer and insulating coating, and preparation method thereof

The invention discloses low-noise oriented silicon steel with a high-tension bottom layer and an insulating coating. The oriented silicon steel comprises an oriented silicon steel plate, and an isolating bottom layer and the insulating coating which are sequentially formed on the surface of the oriented silicon steel plate, and is formed by coating the oriented silicon steel plate with an annealing isolating agent, carrying out high-temperature annealing, then coating with an insulating coating liquid, and drying and sintering. By simultaneously adjusting the annealing isolating agent and theinsulating coating liquid for the oriented silicon steel, the bottom layer and the surface insulating coating with high tension are formed, so that the magnetic domain of the steel plate can be effectively refined, the iron loss and magnetostriction are reduced, and the oriented silicon steel with low noise characteristic is further prepared; and the related preparation method is simple, convenient to operate, low in cost