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Unidirectional silicon steel sheet excellent in adhesion of insulating coating film imparting tensile force and its mfg. method

An insulating skin, single-orientation technology, applied in the direction of manufacturing tools, magnetic materials, magnetic objects, etc., can solve the problems of insufficient reduction of iron loss and difficulty in film adhesion

Inactive Publication Date: 2003-12-10
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the conventional film forming method, it is very difficult to achieve a film tension sufficient to produce a mirror surface effect and to ensure film adhesion, and it is impossible to sufficiently reduce iron loss.

Method used

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  • Unidirectional silicon steel sheet excellent in adhesion of insulating coating film imparting tensile force and its mfg. method
  • Unidirectional silicon steel sheet excellent in adhesion of insulating coating film imparting tensile force and its mfg. method
  • Unidirectional silicon steel sheet excellent in adhesion of insulating coating film imparting tensile force and its mfg. method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0141] Decarburization annealing is carried out on the cold-rolled sheet used for the manufacture of unioriented silicon steel sheet with a thickness of 0.225mm and a Si content of 3.30%, and then it is pickled in a mixed solution of ammonium fluoride and sulfuric acid to dissolve and remove the surface oxide layer. Next, aluminum oxide powder is coated by electrostatic coating method, and finished annealing is carried out in a dry hydrogen atmosphere at a temperature of 1200°C for 20 hours. There were no inorganic minerals on the surface of the double-recrystallized single-oriented silicon steel sheet thus produced, and had specular luster. With respect to this steel sheet, a sample (Example) in which the surface of the steel sheet was wiped with a brush with alumina abrasive grains and a sample in which the above-mentioned wiping was not performed (Comparative Example) were prepared. Then, heat treatment is performed at a temperature of 900°C in an atmosphere of 50% nitrogen...

Embodiment 2

[0146] Decarburization annealing is carried out on the cold-rolled sheet with a thickness of 0.225mm and a Si content of 3.35% for the manufacture of single-oriented silicon steel sheets, and the surface is coated with an annealing separator mainly composed of magnesium oxide and bismuth chloride. paste and dry. Next, finish annealing for 20 hours at a temperature of 1200° C. in a dry hydrogen atmosphere to obtain a unidirectional silicon steel sheet that has undergone secondary recrystallization substantially free of inorganic minerals on the surface. Subsequently, a sample (Example) which was acid-washed with 2% nitric acid for 5 seconds at room temperature to form minute irregularities on the surface and a sample which was not pickled (Comparative Example) were prepared. Then, the steel sheet was heat-treated in an atmosphere of 25% nitrogen, 75% hydrogen, and a dew point of -15°C at a temperature of 1150°C to form an external oxide-type oxide film mainly composed of silico...

Embodiment 3

[0151] Decarburization annealing is performed on a cold-rolled sheet with a thickness of 0.225mm and a Si content of 3.25% for the production of a single-oriented silicon steel sheet, and a water slurry of an annealing separator mainly composed of alumina is coated on the surface and dried . Next, finish annealing for 20 hours at 1200°C in a dry hydrogen atmosphere to obtain a unidirectional silicon steel sheet that has undergone secondary recrystallization and has a specular luster substantially free of inorganic minerals on the surface. For the steel sheet, a sample (Example) in which the surface of the steel sheet was wiped with a brush with silicon carbide abrasive grains (Example) and a sample in which the above-mentioned wiping was not performed (Comparative Example) were prepared. Then, heat treatment is performed at a temperature of 800°C in an atmosphere of 30% nitrogen, 70% hydrogen, and a dew point of -2°C to form an external oxidation type oxide film. Subsequently...

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Abstract

The present invention provides a grain-oriented silicon steel sheet excellent in adhesiveness to tension-creating insulating coating films formed on the grain-oriented silicon steel sheet produced by removing inorganic mineral films composed of forsterite and so on with pickling or the like or by deliberately preventing the formation thereof, characterized by: having, at the interface between each of the tension-creating insulating coating films and the steel sheet, an external oxidation type membranous oxide film of 2 to 500 nm in average thickness mainly composed of amorphous silica and / or a mixed oxide film consisting of an external oxidation type membranous oxide film of 2 to 500 nm in average thickness mainly composed of amorphous silica and particulate oxides mainly composed of amorphous silica: and satisfying any one or more of the specified requirements.

Description

field of invention [0001] The present invention relates to consciously preventing the generation of forsterite (Mg 2 SiO 4 ) and other inorganic mineral coatings, and then planarized the surface to achieve mirror gloss through the finished product annealed single-oriented silicon steel sheet to form a layer of single-oriented silicon steel sheet that can provide tensile insulating coating and its manufacturing method. Background technique [0002] Single-oriented silicon steel sheets are widely used as magnetic iron core materials, especially in order to reduce energy loss and require less iron loss materials. In order to reduce the iron loss, applying tension to the steel plate is an effective method. Therefore, the purpose of reducing the iron loss is achieved by applying tension to the steel plate by forming a film made of a material with a lower thermal expansion coefficient than the steel plate at high temperature. During the annealing process of the finished product,...

Claims

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Application Information

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IPC IPC(8): C21D8/12C23C8/02C23C8/10C23C8/80C23C28/00C23C28/04C23C30/00H01F1/147
CPCC23C28/048C23C8/80C21D8/1283C21D8/1288C23C8/02C21D8/1272H01F1/14783C23C28/04C23C30/00C23C8/10Y10T428/249953C23C22/00
Inventor 重里元一藤井浩康村上健一牛神义行中村修一杉山昌章
Owner NIPPON STEEL CORP
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