A method and device for continuously preparing high-silicon silicon steel strips

Abstract

The invention provides a method and device for continuous preparing of a high-silicon silicon steel thin strip, and belongs to the technical field of magnetic material preparing and composite electroplating. The method comprises the steps that modified iron-silicon particles are prepared and added in iron-plating electroplate liquid, the magnetic field with the intensity being 0.001-0.2T is applied to the electrolysis area, a pure-iron thin strip or a low-silicon silicon steel thin strip is adopted as a cathode, a pure-iron sheet or a low-silicon steel plate serves as an anode, the composite plating method is utilized, and plating of a composite clad layer with the silicon content larger than 10 wt% is conducted on a cathode thin strip; and finally, after being dried, the cathode thin strip is placed in an electric furnace with protective gas to be subjected to continuous heat treatment and diffusion treatment, and the uniform-distribution high-silicon silicon steel thin strip with theaverage silicon content being 6.5 Wt%. The long-size, low-temperature and continuous operation is achieved, the near-net-shape thin strip can be prepared, and therefore the preparing cost can be greatly reduced.

Description

technical field [0001] The patent of the present invention relates to a method and device for continuously preparing high-silicon silicon steel thin strips under a low-intensity magnetic field. The invention belongs to the technical field of magnetic material preparation and composite electroplating. Background technique [0002] Silicon steel strips, especially high-silicon silicon steel strips with a silicon content of 6.5wt% Si, have excellent soft magnetic properties and are ideal materials for high-frequency motor cores. They are soft magnetic materials with the largest output and consumption in the fields of electricity and magnetism. It is widely used in the field of energy conversion in electric power, electronics and national defense military industry. If the silicon content in silicon steel is increased to 6.5%, the magnetostriction can be approached to zero, and the magnetic properties are the best. It is an ideal material for high-frequency soft magnetic materia...

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Problems solved by technology

At present, only the CVD method developed by Japan's NKK company to prepare high-silicon silicon steel thin strips has been industrialized on a small scale, but it has disadvantages such as high energy consumption, poor surface quality of silicon steel, serious iron loss, and environmental pollution, so it cannot be further scaled up. Production

However, the composite electrodeposition method is used to prepare high-silicon silicon steel thin strips. The conventional electrodeposition method cannot obtain a silicon-rich layer with a relatively high silicon content. However, when composite electrodeposition is used under a magnetic field, although the silicon content of the obtained coating is relatively high, the application The applied magnetic field strength is relatively high, and the coating morphology is relatively rough

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