A method and device for preparing high-silicon silicon steel strips under a low-intensity magnetic field

A low-strength, magnetic field technology, applied in coatings, electrolytic coatings, etc., can solve the problems of insufficient silicon source for low-silicon substrates, poor uniformity of silicon element distribution, and restrictions, so as to achieve stable and controllable production processes and avoid processing difficulties , The effect of the original structure is small

Inactive Publication Date: 2020-07-14
GUIZHOU INST OF TECH
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  • Abstract
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Problems solved by technology

However, the use of these processes is complex, high energy consumption, and poor uniformity in the distribution of silicon elements, which limit its application
When the electrodeposition-diffusion preparation method is used, electroplating is carried out under conventional conditions, and the silicon content of the obtained coating is small, which cannot provide sufficient silicon sources for the low-silicon substrate. Applying a magnetic field can significantly increase the silicon content of the coating, but the surface of the coating is very rough, and The strength of the applied magnetic field is relatively high. Regardless of the electroplating under conventional conditions or under a magnetic field, the hydrogen evolution reaction in the electroplating process is relatively serious when using an aqueous electroplating solution, and the bonding strength between the obtained coating and the substrate is low, which limits the further application of the process; therefore, the development Cheap and efficient high-silicon silicon steel preparation method is still a key problem to be solved urgently

Method used

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  • A method and device for preparing high-silicon silicon steel strips under a low-intensity magnetic field

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Effect test

Embodiment 1

[0039] 1) Preparation of modified silicon-iron particles: the particle size is not more than 10μm pure silicon powder, firstly add the silicon particles into the reducing environment ferrous solution for electroless reduction, so that the surface of the silicon particles is coated with a layer of pure iron layer, the modified silicon-iron particles are obtained, compared with pure silicon particles, the magnetic susceptibility and conductivity of the particles are significantly improved. Then it is filtered and dried in a vacuum environment for later use.

[0040] 2) Preparation of the iron reduction solution: the PAA polymer surfactant and deionized water with a concentration of 20wt% are added to the deionized water in a ratio of 1 to 4 to 10, and a wetting agent (sodium dodecylsulfamate) is added 0.2g / L, dispersant (hexadecyltrimethylammonium bromide) 5g / L, catalyst activator (palladium chloride) 2g / L, add silicon particles 100-500g / L, stir vigorously in water bath for 60mi...

Embodiment 2

[0046] see figure 1 , the device for preparing high-silicon steel thin strips under the low-intensity magnetic field is applied to the above method, including a constant magnetic field generator 1, a protection device 2, a temperature-resistant electroplating tank 3, an electroplating tank cover plate 4, a polytetrafluoroethylene base plate 5, an electroplating Liquid 6, modified silicon-iron particles 7, pure iron anode plate 8, low-silicon steel strip cathode 9, pulse power supply 10, mechanical stirring paddle 11, mechanical stirring control device 12, grid baffle plate 14 with mesh 13 and other components; the temperature-resistant electroplating tank 3 is placed on a polytetrafluoroethylene base plate 5, and the periphery is sequentially composed of a temperature-resistant electroplating tank 3, a protection device 2 and a constant magnetic field generator 1; the temperature-resistant electroplating tank 3. The electroplating solution 6 and the modified silicon-iron parti...

Embodiment 3

[0048] A method for preparing high-silicon silicon steel strips under a low-intensity magnetic field, the specific operation process of this embodiment is as follows:

[0049] The electroplating solution 6 containing the peak particle size of 2 μm and the silicon particle surface coated with a 0.1-0.5um iron layer to obtain the modified silicon-iron particles 7 is placed in a temperature-resistant electroplating tank 3 with a capacity of 50L. The composition of the electroplating solution For: alcohol as solvent, 0.5mol / L Na2SO4, 0.90mol / L FeSO4, 0.15mol / L FeCl2, 0.43mol / LNH4Cl, add 20g / L modified silicon-iron particles 7. The temperature-resistant electroplating tank 3 is provided with a pure iron sheet anode plate 8 and a thin strip cathode 9 of low-silicon silicon steel with a silicon content of 3 wt % Si. At the same time, in order to ensure that the modified silicon-iron particles 7 in the electroplating solution 6 are evenly distributed, a mechanical stirring paddle 11 a...

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Abstract

The invention discloses a method for utilizing a static magnetic field pulse composite electroplating technology for obtaining a high-silicon clad layer on the surface of a low-silicon steel sheet andthen obtaining a high-silicon silicon steel thin strip with the silicon content being 6.5 wt% of Si through the heat treatment technology. According to the method, operation is simple, the silicon increasing operation can be achieved at the normal temperature, cost is low, and the near-net-shape high-silicon silicon steel strip can be prepared.

Description

technical field [0001] The invention relates to a method and a device for preparing high-silicon silicon steel strips under a magnetic field. The invention belongs to the technical field of soft magnetic material preparation and electroplating. Background technique [0002] As a very important energy conversion material, silicon steel thin strip is widely used in electric power, electrical appliances, electronics and national defense and military industries. Silicon steel is currently the soft magnetic material with the largest output and consumption in the fields of electricity and magnetism. With the increase of silicon content, the soft magnetic properties of silicon steel thin strips are enhanced. When the silicon content in silicon steel increases to 6.5wt%, the magnetic properties of silicon steel reach the best. At this time, the magnetostriction coefficient of silicon steel thin strips is almost reduced to zero. . However, as the silicon content increases, the brit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D5/18C25D15/00C25D5/50C25D7/06
CPCC25D5/006C25D5/18C25D5/50C25D7/0614C25D15/00
Inventor 龙琼路坊海张英哲
Owner GUIZHOU INST OF TECH
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