Metal treatment – Compositions – Heat treating
Patent
1975-11-05
1976-12-07
Kendall, Ralph S.
Metal treatment
Compositions
Heat treating
148 616, 148113, 252 635, 106286, 148 315, C23F 710
Patent
active
039960730
ABSTRACT:
Insulative coatings for electrical steels and methods of making them. The coatings are hard, glassy and smooth in nature, are easily cured and improve the magnetic characteristics of the electrical steels. The coatings are produced by applying to an electrical steel an aluminum-magnesium-phosphate solution containing Al.sup.+.sup.+.sup.+, Mg.sup.+.sup.+ and H.sub.2 PO.sub.4.sup.- in a specified relative relationship and from 0 to 60% by weight colloidal silica on a water-free basis. The solutions contain at least 45% by weight water. Chromic anhydride (CrO.sub.3) may be added to the coating solutions to improve wettability of the solutions, moisture resistance of the resulting coatings and interlaminar resistivity after stress relief anneal. An electrical steel coated with a solution of the present invention is thereafter subjected to a heat treatment to cure the insulative coating thereon.
REFERENCES:
patent: 2501846 (1950-03-01), Gifford
patent: 2554250 (1951-05-01), Horstman
patent: 2743203 (1956-04-01), Steinherz
patent: 3138492 (1964-06-01), Perry
patent: 3144364 (1964-08-01), Robinson et al.
patent: 3207636 (1965-09-01), Wada
patent: 3248249 (1966-04-01), Collins Jr.
patent: 3248250 (1966-04-01), Collins Jr.
patent: 3248251 (1966-04-01), Allen
patent: 3528863 (1970-09-01), Foster et al.
patent: 3720549 (1973-03-01), Hirst et al.
patent: 3840378 (1974-10-01), Evans
patent: 3948786 (1976-04-01), Evans
Armco Steel Corporation
Kendall Ralph S.
LandOfFree
Insulative coating for electrical steels does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Insulative coating for electrical steels, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Insulative coating for electrical steels will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-377398