Method for forming an insulating coating on an oriented silicon

Details Method for forming an insulating coating on an oriented silicon Method for forming an insulating coating on an oriented silicon

1974-09-19

1976-10-12

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

148 635, 148 167, 148113, 148 615R, C23F 710, C23F 726

Patent

active

039855830

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.

REFERENCES:
patent: 2484242 (1949-10-01), Nagel et al.
patent: 3138492 (1964-06-01), Peny et al.
patent: 3248249 (1966-04-01), Collins
patent: 3562011 (1971-02-01), Hust et al.
patent: 3615918 (1971-10-01), Evans et al.
patent: 3856568 (1974-12-01), Tanaka et al.

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