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A kind of electrical steel plate and preparation method thereof

A technology for electrical steel and steel sheet, which is applied in the manufacture of inductors/transformers/magnets, circuits, electrical components, etc. It can solve the problem that electrical steel products cannot be annealed, stress relief annealed, and have no heat resistance. and other problems to achieve the effect of reducing the size of the production site and protective facilities, improving mechanical properties, and increasing hardness

Active Publication Date: 2018-03-30
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 plate and preparation method thereof
  • A kind of electrical steel plate and preparation method thereof
  • A kind of electrical steel plate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The raw materials are electrical steel plates processed by laser scoring, and their specifications are 0.18mm thick. Heat the plate to 50°C, and coat CaO powder with a particle size of 2 μm and MgO powder with a particle size of 1 μm on the inner surface of the scored groove. The volume fraction ratio of CaO powder to MgO powder is 1:2, and the powder coating area Accounting for 55% of the inner surface area of ​​the groove, then spray high-temperature water vapor at the groove, keep it for 5 minutes and then take it out, and form the products of calcium silicate hydrate phase and magnesium silicate hydrate phase on the inner surface of the groove, the volume fraction of the two The ratio is 1:2, the particle size of the product is between 30nm, and the surface area accounts for about 30% of the inner surface area of ​​the groove. Then the surface was rinsed with a neutral salt solution for 2 minutes, and dried at room temperature.

[0053] The magnetic properties of t...

Embodiment 2

[0058] The raw materials are electrical steel sheets processed by laser scoring, and their specifications are 0.23mm thick. Heat the plate to 50°C, and pave CaO powder with a particle size of 0.01 to 4 μm and MgO powder with a particle size of 0.01 to 4 μm on the inner surface of the scored groove. The volume fraction ratio of CaO powder to MgO powder is 1:10, The powder covering area accounts for 40% of the inner surface of the groove, and then spray high-temperature water vapor at the groove, keep it for 5 minutes and then take it out, forming the products of calcium silicate hydrate phase and magnesium silicate hydrate phase on the inner surface of the groove, The volume fraction ratio of the two is 1:9, the particle size of the product is between 1 and 20 nm, and the total surface area accounts for about 40% of the inner surface area of ​​the groove. Then the surface was rinsed with a neutral salt solution for 2 minutes, and dried at room temperature.

[0059] The magneti...

Embodiment 3

[0063] The raw materials are electrical steel sheets processed by laser scoring, and their specifications are 0.27mm thick. Heat the plate to 50°C, and pave CaO powder with a particle size of 1-6 μm and MgO powder with a particle size of 1-5 μm on the inner surface of the scored groove. The volume fraction ratio of CaO powder to MgO powder is 1:5, and the powder The paving area accounts for 50% of the inner surface area of ​​the groove, and then spray high-temperature water vapor at the groove, keep it for 5 minutes and then take it out, and the products of the calcium silicate hydrate phase and the magnesium silicate hydrate phase are formed on the inner surface of the groove. The ratio of the volume fraction is 1:3, the particle size of the product is between 20 and 70nm, and the surface area accounts for about 60% of the inner surface area of ​​the groove. Then the surface was rinsed with a neutral salt solution for 2 minutes, and dried at room temperature.

[0064] The ma...

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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, and calcium silicate hydrate phases distributed on the surface of the scoring grooves. and the hydrated magnesium silicate phase, the thickness of the matrix is ​​0.1-2 mm, and the diameters of the hydrated calcium silicate phase and the hydrated magnesium silicate phase are 1-100 nm. The method comprises the steps of: 1) laser scoring treatment; 2) (CaO+MgO) powder treatment of the scoring groove: CaO and MgO react with SiO2 on the surface of the scoring groove to generate calcium silicate hydrate phase and water Magnesium silicate phase; 3) Rinse the electrical steel plate obtained in step 2) and dry it. The electrical steel sheet of the present invention has excellent heat resistance effect, that is, after annealing at 800°C and heat preservation for 2 hours, the iron loss reduction effect caused by laser scoring will not disappear, and the original magnetic properties can be maintained without damaging the surface of the silicon steel The insulating coating has a simple preparation method and low 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 杨富尧马光程灵吴雪高洁陈新吴细毛祝志祥聂京凯
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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