Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1984-04-10
1985-04-23
Sheehan, John P.
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
148 22, 148 28, H01F 104
Patent
active
045128235
ABSTRACT:
The instant invention is directed to a slurry for use in coating silicon steel prior to high temperature annealing, comprising magnesium oxide, water and at least one inorganic compound selected from the group consisting of barium oxide, barium nitrate, chromium nitrate, and their hydrates.
The instant invention is also directed to a process for coating silicon steel, comprising coating the steel with a magnesium oxide slurry prior to high temperature annealing, the improvement wherein at least one inorganic compound selected from the group consisting of barium oxide, barium nitrate, chromium nitrate, and their hydrates is pre-mixed in said slurry, thereby minimizing the formation of "tight magnesia" on the steel.
REFERENCES:
patent: 3522108 (1970-07-01), Yamamoto et al.
patent: 3670278 (1972-06-01), Foster
patent: 3687742 (1972-08-01), Foster et al.
patent: 3705826 (1972-12-01), Hirst et al.
patent: 4255205 (1981-03-01), Morito et al.
patent: 4347085 (1982-08-01), Hasekorn et al.
The Condensed Chemical Dictionary, 1971, p. 212.
Howe Michael W.
Sopp Samuel W.
Calgon Corporation
Mitchell W. C.
Olson R. B.
Sheehan John P.
Sudol M. C.
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