Insulating coating-attached electrical steel sheet and manufacturing method therefor

Patent metadata

Field	Value
Publication number	US-11923115-B2
Application number	US-201916967945-A
Country	US
Kind code	B2
Filing date	Jan 21, 2019
Priority date	Feb 6, 2018
Publication date	Mar 5, 2024
Grant date	Mar 5, 2024

Abstract

An insulating coating-attached electrical steel sheet has, on at least one surface, an insulating coating including an insulating tensile coating layer A. A tension applied to the steel sheet by an insulating tensile coating layer having a coating weight of M/2 from a surface of the insulating tensile coating layer A is 0.80×σ A or more, where M is a weight of the insulating tensile coating layer A, and σ A is the tension applied to the steel sheet by the insulating tensile coating layer A. The insulating coating-attached electrical steel sheet has excellent adhesion of the insulating coating. A method for manufacturing the insulating coating-attached electrical steel sheet is also provided.

First claim

The invention claimed is:

1. An insulating coating-attached electrical steel sheet comprising:
the steel sheet, and
on at least one surface of the steel sheet, an insulating coating including an insulating tensile coating layer A, wherein:
a tension applied to the steel sheet by an insulating tensile coating layer having a coating weight of M/2 from a surface of the insulating tensile coating layer A is 0.80×σ A or more, where M is a weight of the insulating tensile coating layer A, and σ A is a tension applied to the steel sheet by the insulating tensile coating layer A.

2. The insulating coating-attached electrical steel sheet according to claim 1 , wherein the insulating tensile coating layer A primarily contains glass or glass ceramics.

3. The insulating coating-attached electrical steel sheet according to claim 2 , wherein the insulating tensile coating layer A is silicophosphate glass or silicophosphate glass ceramics containing one or more elements selected from Mg, Al, Ca, Ba, Sr, Zn, Ti, Nd, Mo, Cr, B, Ta, Cu, and Mn.

4. The insulating coating-attached electrical steel sheet according to claim 1 , wherein the insulating tensile coating layer A is silicophosphate glass or silicophosphate glass ceramics containing one or more elements selected from Mg, Al, Ca, Ba, Sr, Zn, Ti, Nd, Mo, Cr, B, Ta, Cu, and Mn.

5. A method for manufacturing an insulating coating-attached electrical steel sheet comprising the steel sheet, and on at least one surface of the steel sheet, an insulating coating including an insulating tensile coating layer A, wherein:
a tension applied to the steel sheet by an insulating tensile coating layer having a coating weight of M/2 from a surface of the insulating tensile coating layer A is 0.80×σ A or more, where M is a weight of the insulating tensile coating layer A, and σ A is a tension applied to the steel sheet by the insulating tensile coating layer A; and the method comprising:
forming the insulating tensile coating layer A by applying a treatment solution for coating formation containing colloidal silica and at least one selected from Mg, Al, Ca, Ba, Sr, Zn, Ti, Nd, Mo, Cr, Ta, Cu, and Mn salts of phosphoric acid, boric acid, and silicic acid to at least either surface of the electrical steel sheet, subsequently heating the coated electrical steel sheet at a heating rate of 100° C./s or more in a temperature range of 600° C. or higher and 700° C. or lower, and then
baking the heated electrical steel sheet at 800° C. or higher.

6. The method for manufacturing an insulating coating-attached electrical steel sheet according to claim 5 , wherein the baking is performed in an atmosphere having: (i) a temperature range of 700° C. or higher and (ii) a dew point of −20° C. or higher and 10° C. or lower.

7. A method for manufacturing an insulating coating-attached electrical steel sheet comprising the steel sheet, and on at least one surface of the steel sheet, an insulating coating including an insulating tensile coating layer A; wherein:
a tension applied to the steel sheet by an insulating tensile coating layer having a coating weight of M/2 from a surface of the insulating tensile coating layer A is 0.80×σ A or more, where M is a weight of the insulating tensile coating layer A, and σ A is a tension applied to the steel sheet by the insulating tensile coating layer A; the method comprising:
forming the insulating tensile coating layer A by applying a treatment solution for coating formation containing colloidal silica, at least one selected from Mg, Al, Ca, Ba, Sr, Zn, Cr, and Mn salts of phosphoric acid, and a compound containing at least one selected from Ti, Nd, Mo, B, Ta, and Cu to at least either surface of the electrical steel sheet, subsequently
heating the coated electrical steel sheet at a heating rate of 100° C./s or more in a temperature range of 600° C. or higher and 700° C. or lower, and then
baking the heated electrical steel sheet at 800° C. or higher.

8. The method for manufacturing an insulating coating-attached electrical steel sheet according to claim 7 , wherein the baking is performed in an atmosphere having: (i) a temperature range of 700° C. or higher and (ii) a dew point of −20° C. or higher and 10° C. or lower.

Assignees

• Jfe Steel Corp

Inventors

• Terashima Takashi
• SUEMUNE Masahiro
• KOKUFU Karin
• Takamiya Toshito

Classifications

• H01F1/147 Primary

  Alloys characterised by their composition {(treatment thereof for enhancing their electromagnetic properties C21D8/12)} · CPC title

• C23C22/82

  After-treatment · CPC title

• C23C28/04

  only coatings of inorganic non-metallic material · CPC title

• C22C38/001

  containing N · CPC title

• C22C38/02

  containing silicon · CPC title