Magnesium oxide coating for electrical steels and the method of

Details Magnesium oxide coating for electrical steels and the method of Magnesium oxide coating for electrical steels and the method of

1991-04-12

1993-03-09

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148 27, 148 28, H01F 104

Patent

active

051923734

ABSTRACT:
Decarburized grain oriented silicon steel is provided with an annealing separator which forms a glass film after the final high temperature anneal. The magnesia used as the annealing separator has a total chlorine level of 0.01 to 0.20% by weight based on the weight of magnesia with at least 0.01% metal chloride selected from the group of Mg, Ca, Na and K. The chloride addition acts to seal the coating surface during the final anneal to control diffusion and stabilize the secondary grain growth. The glass film which forms during the anneal may be laser scribed for domain refinement without coating damage. The magnesia may also contain additions of phosphates, TiO.sub.2, SiO.sub.2, Cr and B. The temperature of the magnesia is maintained below 25.degree. C. to control hydration and eliminate the need for other additives in the magnesia slurry to control hydration.

REFERENCES:
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patent: 3697322 (1972-10-01), Lee et al.
patent: 4344802 (1982-08-01), Haselkorn
patent: 4443425 (1984-04-01), Sopp et al.
patent: 4740251 (1988-04-01), Howe
patent: 4875947 (1989-10-01), Nakayama et al.

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