Method and device for continuously preparing high-silicon steel ribbon under magnetic field

Abstract

The invention provides a method and a device for continuously preparing a high-silicon steel ribbon under a magnetic field. The method adopts a composite plating method and comprises the following steps of adding 0.1-3mum of ferrosilicon powder in an iron plating solution, using a low-silicon steel strip as an electrolytic cathode, plating 7.0-99 wt % of thick composite plating layer of Si in the composite electrolytic solution, obtaining uniform 6.5 wt% of high-silicon steel ribbon of the Si after thermal treatment, and carrying out continuous preparation. According to the device provided by the invention, on the basis of the traditional composite plating device, a constant magnetic field of which the magnetic field strength is 0.01-20 T is applied, the low-silicon steel ribbon which is used as a cathode is magnetized through the magnetic field, a stronger gradient field is formed on the surface, ferrosilicon particles in a plating solution are adsorbed to the surface of the cathode of the low-silicon steel strip by utilizing a magnetic field force, thus a high-silicon plating layer can be obtained through a composite iron plating process, and then, the high-performance high-silicon steel ribbon of which the silicon content is up to 6.5 wt% can be prepared through follow-up climate protection thermal treatment. The method and the device, disclosed by the invention, have the advantages that the operation is simple, the low-temperature silicon increasing operation is carried out, the cost is low, and the high-silicon steel ribbons can be continuously prepared.

Description

technical field [0001] The invention relates to a method and device for continuously preparing high-silicon steel strips under a magnetic field. The invention belongs to the technical field of magnetic material preparation and composite electroplating. Background technique [0002] Silicon steel is the soft magnetic material 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 military industries. Therefore, it is also an important metal functional material with great potential for energy saving. It has been known in theory for a long time that if the silicon content in silicon steel is increased to 6.5%, the magnetostriction can approach zero and the magnetic properties will be the best. However, when the silicon content exceeds 4wt%, as the silicon content increases, the material becomes brittle, making it difficult to perform rolling and stamping. [00...

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Problems solved by technology

The powder metallurgy method requires steps such as powder mixing, compression molding, sintering, multi-pass rolling, coating of MgO powder insulation layer, and secondary sintering. The process is complicated, and the uniformity of silicon and the continuity of the process are poor. High energy consumption, and still limited by the brittleness of silicon steel

The thin-strip silicon steel produced by the CVD method developed by Japan's NKK company has good magnetic properties and has been industrialized on a small scale, but there are high deposition temperatures, high energy consumption, poor surface quality of silicon steel, need for warm rolling and smoothing, and iron loss. serious disadvantages such as while SiCl 4 It is highly corrosive, and it will produce hydrochloric acid mist when it encounters water vapor, and the reaction product FeCl 2 Exhaust gas pollutes the environment and cannot be mass-produced

In addition, there are PCVD method, molten salt electrodeposition method, laser cladding spraying method and electron beam physical vapor deposition method, etc., but the above methods still need to be further improved in terms of production process controllability, cost and environmental protection.

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