Method for forming an insulating coating on an oriented silicon steel sheet
US3985583A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 19, 1974 |
| Grant date | Oct 12, 1976 |
| Priority date | — |
| Expiry date | Sep 19, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/14783
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
An insulating coating having a high adhesion on an oriented silicon steel sheet, which applies a tension on the surface of the steel sheet and restrains magnetostriction increased when compressive stress is subjected to said oriented silicon steel sheet, is formed by applying a coating aqueous dispersion of 7 - 24% by weight of colloidal silica and 5 - 30% by weight of magnesium phosphate in monobasic magnesium phosphate on the oriented silicon steel sheet and baking the thus treated steel sheet at a temperature of 350.degree. - 900.degree.C. Said coating is more improved by adding 0.01 - 5% by weight of at least one of chromic anhydride, chromates and bichromates to said coating aqueous dispersion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.