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
CN1461357AInactive Publication Date: 2003-12-10NIPPON STEEL CORP
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
NIPPON STEEL CORP
Publication Date
2003-12-10
Estimated Expiration
Not applicable · inactive patent

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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.
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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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