Method for forming an insulating glass film on a grain-oriented

Details Method for forming an insulating glass film on a grain-oriented Method for forming an insulating glass film on a grain-oriented

1975-02-24

1976-01-06

Satterfield, Walter R.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148 315, 148112, 427127, H01F 104

Patent

active

039309061

ABSTRACT:
An insulating glass film having an excellent uniformity and a high adhesion to a grain-oriented silicon steel sheet having a high magnetic induction is formed by annealing a coil of a cold rolled silicon steel sheet having a final gauge in an annealing furnace under a non-oxidizing and non-reducing neutral inert gas, such as nitrogen or argon at a constant temperature keeping stage of 800.degree.-920.degree.C and then under dry hydrogen at a temperature of 1,000.degree.-1,200.degree.C in the final annealing stage.

REFERENCES:
patent: 3632456 (1972-01-01), Sakakura et al.
patent: 3770517 (1973-11-01), Gray et al.
patent: 3853641 (1974-12-01), Sakakura et al.
patent: 3872704 (1975-03-01), Ohya et al.

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