Method of making an electrical steel sheet provided with insulating coating
US11177052B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 22, 2019 |
| Grant date | Nov 16, 2021 |
| Priority date | — |
| Expiry date | Sep 15, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/18
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method for forming an insulating coating on an electrical steel sheet is provided. The method includes preparing a treatment solution by adding a Si compound to water and applying the treatment solution to a surface of the electrical steel sheet. Fe in the electrical steel sheet dissolves in the treatment solution and, thereafter, the electrical steel sheet and treatment solution are baked to form the insulating film. In the insulating film, a coating weight of Si in terms of SiO2 is 50% to 99% of the total coating weight, and a ratio (Fe/Si) of content of Fe to content of Si in the insulating coating is 0.01 to 0.6 on a molar basis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.