Coating liquid for forming insulation coating for grain-oriented electrical steel sheet, method of manufacturing grain-oriented electrical steel sheet, and grain-oriented electrical steel sheet

Patent metadata

Field	Value
Publication number	US-2025043373-A1
Application number	US-202418923474-A
Country	US
Kind code	A1
Filing date	Oct 22, 2024
Priority date	Mar 28, 2018
Publication date	Feb 6, 2025
Grant date	—

Abstract

In the present invention, there is provided a coating liquid for forming an insulation coating for a grain-oriented electrical steel sheet, including: a solvent; and one or two more layered clay mineral powders having a specific surface area of 20 m2/g or more. In addition, in the present invention, there is provided a grain-oriented electrical steel sheet including: a base metal; and an insulation coating provided on a surface of the base metal, in which the insulation coating contains SiO2, and one or two of Al2O3 and MgO, and has a porosity of 10% or less.

First claim

1 . A method of manufacturing a grain-oriented electrical steel sheet using a coating liquid for forming an insulation coating for the grain-oriented electrical steel sheet, comprising:
a solvent; and one or two or more layered clay mineral powders having a specific surface area of 20 m 2 /g or more; and wherein the coating liquid does not contain a binder.

2 . The method according to claim 1 ,
wherein the specific surface area of the layered clay mineral powder is 150 m 2 /g or less.

3 . The method according to claim 1 ,
wherein the layered clay mineral powder is one or two or more powders selected from kaolin, talc, and pyrophyllite.

4 . The method according to claim 2 ,
wherein the layered clay mineral powder is one or two or more powders selected from kaolin, talc, and pyrophyllite.

5 . The method according to claim 1 , further comprising:
an inorganic dispersant in an amount more than 0 mass % and equal to or less than 20 mass % with respect to the layered clay mineral powder.

6 . The method according to claim 2 , further comprising:
an inorganic dispersant in an amount more than 0 mass % and equal to or less than 20 mass % with respect to the layered clay mineral powder.

7 . The method according to claim 3 , further comprising:
an inorganic dispersant in an amount more than 0 mass % and equal to or less than 20 mass % with respect to the layered clay mineral powder.

8 . The method according to claim 4 , further comprising:
an inorganic dispersant in an amount more than 0 mass % and equal to or less than 20 mass % with respect to the layered clay mineral powder.

9 . The method according to claim 5 ,
wherein the inorganic dispersant is one or two or more selected from sodium diphosphate, sodium hexametaphosphate, sodium silicate, and potassium silicate.

10 . The method according to claim 6 ,
wherein the inorganic dispersant is one or two or more selected from sodium diphosphate, sodium hexametaphosphate, sodium silicate, and potassium silicate.

11 . The method according to claim 7 ,
wherein the inorganic dispersant is one or two or more selected from sodium diphosphate, sodium hexametaphosphate, sodium silicate, and potassium silicate.

12 . The method according to claim 8 ,
wherein the inorganic dispersant is one or two or more selected from sodium diphosphate, sodium hexametaphosphate, sodium silicate, and potassium silicate.

13 . The method according to claim 1 ,
wherein an amount of a chromium compound is 4 mass % or less with respect to the layered clay mineral powder.

14 . The method according to claim 2 ,
wherein an amount of a chromium compound is 4 mass % or less with respect to the layered clay mineral powder.

15 . The method according to claim 3 ,
wherein an amount of a chromium compound is 4 mass % or less with respect to the layered clay mineral powder.

16 . A method of manufacturing a grain-oriented electrical steel sheet, comprising:
a step of applying a coating liquid for forming the insulation coating for a grain-oriented electrical steel sheet according to claim 1 , to a base metal of the grain-oriented electrical steel sheet; and a step of performing a baking treatment on the base metal after the application, at a temperature of 600° C. or higher and 1000° C. or lower to form an insulation coating.

Assignees

• Nippon Steel Corp

Inventors

• Yamazaki Shuichi
• Takeda Kazutoshi
• Fujii Hiroyasu
• Nagai Toru

Classifications

• C23C2222/00

  Aspects relating to chemical surface treatment of metallic material by reaction of the surface with a reactive medium · CPC title

• C23C30/00

  Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process (C23C26/00, C23C28/00 take precedence) · CPC title

• C21D2201/05

  Grain orientation · CPC title

• C21D8/1244 Primary

  characterised by the heat treatment · CPC title

• C09D1/00

  Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances · CPC title