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Treatment solution for insulating coating, grain-oriented electrical steel sheet with insulating coating, and manufacturing method thereof

A technology of insulating film and electromagnetic steel plate, applied in the direction of pretreatment surface, device for coating liquid on the surface, circuit, etc., can solve problems such as poor appearance and iron loss reduction, and achieve excellent iron loss reduction effect and excellent moisture absorption resistance , the effect of suppressing the appearance of bad

Active Publication Date: 2022-05-17
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] According to these proposals, although the moisture absorption resistance, the iron loss reduction effect by the application of tension, and the seizing resistance have been improved, especially in the high-speed roll that increases the conveying speed of the steel plate and applies the insulating coating treatment liquid with a roll coater, In the process of coating, the problem of poor appearance may occur significantly after coating the insulating film treatment liquid and firing

Method used

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  • Treatment solution for insulating coating, grain-oriented electrical steel sheet with insulating coating, and manufacturing method thereof
  • Treatment solution for insulating coating, grain-oriented electrical steel sheet with insulating coating, and manufacturing method thereof
  • Treatment solution for insulating coating, grain-oriented electrical steel sheet with insulating coating, and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] A finish-annealed grain-oriented electrical steel sheet having a thickness of 0.20 mm was prepared. The magnetic flux density B of the grain-oriented electrical steel sheet 8 It is 1.920T. After phosphoric acid pickling was carried out on this grain-oriented electrical steel sheet, the total of both sides after sintering was 8.0 g / m 2 Various chromium-free insulating coating treatment solutions described in Table 1 were applied in the same manner. At this time, the grain-oriented electrical steel sheet was conveyed using a roll coater at two levels of conveying speeds of 120 mpm and 240 mpm, and the above-mentioned insulating coating treatment liquid was applied. Then, at 820°C, 30 seconds, N 2 : A sintering process was carried out under the condition of 100vol% gas atmosphere to manufacture a grain-oriented electrical steel sheet with an insulating coating.

[0089] In Table 1, each dihydrogen phosphate aqueous solution was used as the phosphate, and SNOWTEX C manu...

Embodiment 2

[0112] A finish-annealed grain-oriented electrical steel sheet having a thickness of 0.27 mm was prepared. The magnetic flux density B of the grain-oriented electrical steel sheet 8 It is 1.928T. After phosphoric acid pickling was performed on this grain-oriented electrical steel sheet, the total of both sides after sintering was 12.0 g / m 2 Various chromium-free insulating coating treatment solutions described in Table 2 were applied in the same manner. At this time, the grain-oriented electrical steel sheet was conveyed using a roll coater at two levels of conveying speeds of 100 mpm and 300 mpm, and the above-mentioned insulating coating treatment liquid was applied. Then, at 900°C, 30 seconds, N 2 : 90vol%-H 2 : A sintering treatment was carried out under the condition of 10 vol% gas atmosphere, and a grain-oriented electrical steel sheet with an insulating film was produced.

[0113] In Table 2, as the phosphate, each dihydrogen phosphate aqueous solution was used, an...

Embodiment 3

[0126] A finish-annealed grain-oriented electrical steel sheet having a thickness of 0.23 mm was prepared. The magnetic flux density B of the grain-oriented electrical steel sheet 8 It is 1.923T. After phosphoric acid pickling was performed on this grain-oriented electrical steel sheet, the total of both sides after sintering was 10.0 g / m 2 Various chromium-free insulating coating treatment solutions described in Table 3 were applied in the same manner. At this time, the grain-oriented electrical steel sheet was conveyed using a roll coater at two levels of conveying speeds of 150 mpm and 380 mpm, and the above-mentioned insulating coating treatment liquid was applied. Then, at 950°C, 10 seconds, N 2 : 85vol%-H 2 : The sintering treatment was carried out under the condition of 15vol% gas atmosphere, and the grain-oriented electrical steel sheet with the insulating film was produced.

[0127] In Table 3, an aluminum dihydrogen phosphate aqueous solution was used as the pho...

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Abstract

The present invention provides an insulating coating treatment solution capable of forming a chromium-free insulating coating excellent in moisture absorption resistance, capable of imparting high tension, and excellent in reducing iron loss, and capable of suppressing the occurrence of coating unevenness when coating a steel plate. resulting in poor appearance. The insulating coating treatment solution is used to form a chromium-free insulating coating on the surface of the grain-oriented electrical steel sheet, and the insulating coating treatment solution contains: one of the phosphates selected from Mg, Ca, Ba, Sr, Zn, Al, and Mn or two or more phosphates; colloidal silica; and particles of compounds containing metal elements, with respect to 100 parts by mass of the phosphate, the content of the colloidal silica is expressed as SiO 2 The solid content is 50 to 120 parts by mass in terms of solid content, and the content of the particles of the compound containing metal elements is 5 to 60 parts by mass in terms of metal elements, and the thixotropic index (TI) of the insulating coating treatment solution is 1.00 Above and below 10.00.

Description

technical field [0001] The present invention relates to an insulating coating treatment liquid for forming a chromium-free insulating coating on the surface of a grain-oriented electrical steel sheet. Further, the present invention relates to a grain-oriented electrical steel sheet with an insulating coating provided on the surface with an insulating coating obtained by sintering the above-mentioned insulating coating treatment liquid, and a method for producing the same. Background technique [0002] Generally, a grain-oriented electrical steel sheet is provided with a film on the surface for the purpose of imparting insulation, seizing resistance, rust prevention, and the like. The surface coating includes a base coating mainly composed of forsterite formed during final annealing, and a phosphate-based coating formed thereon. [0003] These films are formed at high temperatures and have low thermal expansion rates. Therefore, when these coatings are lowered to room tempe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/00H01F1/147C22C38/00C22C38/60
CPCC22C38/60C23C22/20C23C22/22C23C22/12C23C22/188C23C22/18C23C22/73C23C22/74C22C38/02H01F1/18C23C22/08H01F1/147C22C38/00B05D1/28B05D3/0254B05D7/14C09D1/00C23C26/00
Inventor 寺岛敬国府花梨渡边诚高宫俊人
Owner JFE STEEL CORP
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