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A kind of electrical steel sheet and preparation method thereof

A technology of electrical steel and steel plates, which is applied in the manufacture of inductors/transformers/magnets, circuits, electrical components, etc., and can solve the problem that the scored electrical steel products cannot be applied to wound core transformer annealing treatment, stress relief annealing treatment, and have no heat resistance To achieve the effect of reducing the size of the production site and the requirements for protective facilities, preventing movement or rotation, and retaining magnetic properties

Active Publication Date: 2018-01-19
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the existing laser scribing technology does not have heat resistance, that is, the silicon steel products after laser scribing cannot be subjected to stress relief annealing, and annealing will cause the iron loss to increase and return to the level before laser scribing
Scored electrical steel products that cannot be achieved with existing technology cannot be used in the field of annealing of coiled core transformers or cores that require bending of silicon steel products

Method used

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  • A kind of electrical steel sheet and preparation method thereof
  • A kind of electrical steel sheet and preparation method thereof
  • A kind of electrical steel sheet and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The raw materials are electrical steel plates processed by laser scoring, and their specifications are 0.18mm thick. Heat the plate to 80°C, keep it warm for 3 minutes, spray NaOH solution with a solution concentration of 5% on its surface, keep it for 6 minutes, and form NaOH on the inner surface of the groove. 2 SiO 3 9H 2 O product, the pit diameter is about 20nm, and the pit area accounts for 30% of the total inner surface area of ​​the groove. The surface is washed with clean water for 2 minutes, and dried at room temperature.

[0045] First, the magnetic properties of the prepared electrical steel samples were tested, and then the samples were annealed at 800°C for 2 hours, and the magnetic properties were tested again. The test results are shown in Table 5. It can be seen from Table 5 that the properties of raw materials remain unchanged after NaOH treatment, and after annealing at 800 °C for 2 hours, the magnetic properties are basically consistent with the in...

Embodiment 2

[0049] The raw materials are electrical steel sheets processed by laser scoring, and their specifications are 0.27mm thick. At room temperature, it is completely immersed in a NaOH solution with a solution concentration of 10%, kept for 2 minutes and then taken out, forming Na on the inner surface of the groove. 2 SiO 3 The product has a pit diameter of about 30nm, and the pit area accounts for 40% of the total surface area of ​​the groove. The surface is washed with clean water for 2 minutes, and dried at room temperature.

[0050] First, the magnetic properties of the prepared electrical steel samples were tested, and then the samples were annealed at 800°C for 2 hours, and then the magnetic properties were tested again. The test results are shown in Table 6. It can be seen from Table 6 that the properties of the raw materials remain unchanged after being treated with NaOH, and after annealing at 800 °C for 2 hours, the magnetic properties are basically consistent with the ...

Embodiment 3

[0054] The raw materials are electrical steel plates processed by laser scoring, and their specifications are 0.30mm thick. At room temperature, it is completely immersed in a NaOH solution with a solution concentration of 15%, kept for 5 minutes and then taken out, forming Na on the inner surface of the groove. 2 SiO 3 The product has a pit diameter of about 60nm, and the pit area accounts for 50% of the total surface area of ​​the groove. The surface is washed with clean water for 2 minutes, and dried at room temperature.

[0055] First, the magnetic properties of the prepared electrical steel samples were tested, and then the samples were annealed at 800 ° C for 2 hours, and then the magnetic properties were tested again. The test results are shown in Table 7. It can be seen from Table 7 that the properties of the raw materials remain unchanged after being treated with NaOH, and after annealing at 800 °C for 2 hours, the magnetic properties are basically consistent with th...

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Abstract

The invention provides an electrical steel plate and a preparation method thereof. The electrical steel plate comprises a plate-shaped electrical steel matrix, scoring grooves on the surface of the matrix, pits distributed on the surface of the scoring grooves, and solid solution Na2SiO3 or Na2SiO3 9H2O on the surface of the substrate, the thickness of the substrate is 0.1-2mm, and the diameter of the pit is 1-100nm; the preparation method includes 1) laser scoring treatment; 2) NaOH solution treatment Scored groove; 3) washing and drying treatment. The electrical steel plate prepared by the present invention has excellent heat-resistant effect. After annealing at 800°C for 2 hours, the iron loss reduction effect caused by laser scoring will not disappear, and the original magnetic properties will be maintained, and the insulating coating on the surface of the silicon steel will not disappear. The layer is not damaged, the preparation method of the invention is simple to operate and low in cost, and is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to an oriented silicon steel for a power transformer, in particular to an electrical steel plate and a preparation method thereof. Background technique [0002] In recent years, people try to apply more laser technology to the research of magnetic domain refinement technology. Rauscher et al. used continuous CO 2 The laser and high-energy fiber laser are used for laser scoring of the oriented silicon steel sheet. The high-energy fiber laser reduces the iron loss by about 13%, and the surface of the silicon steel sheet has no damage. Yang Yuling et al. used the laser nitriding method to carry out local linear nitriding treatment on the surface of grain-oriented silicon steel, studied the influence of laser process parameters on the nitride formation on the surface of silicon steel, and invented the method of continuous CO 2 Laser localized surface alloying of oriented silicon steel by laser, which significantly improves the high ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F3/02H01F27/245H01F41/02
Inventor 杨富尧马光楼其民李靖孔晓峰程灵吴雪高洁陈新祝志祥聂京凯陈川
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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