Method of producing stable magnetic domain refinement of electri

Details Method of producing stable magnetic domain refinement of electri Method of producing stable magnetic domain refinement of electri

1988-06-10

1990-02-27

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148122, H01F 104

Patent

active

049043137

ABSTRACT:
A method is provided for refining the magnetic domain wall spacing of grain-oriented silicon steel sheet having an insulation base coating thereon by removing portions of the base coating to expose a line pattern of the underlying silicon steel substantially transverse to the rolling direction of the steel, applying a metallic contaminant to the steel, the exposed steel being free of thermal and plastic stresses, and thereafter annealing the steel and contaminant thereon at time and temperatures of about 1400.degree. F. or more in a protective atmosphere to diffuse sufficient and controlled amounts of the comtaninant into the steel to produce a permanent pore stable up to 2100.degree. F. to effect heat resistant domain refinement and reduce core loss.

REFERENCES:
patent: 3932235 (1976-01-01), Foster
patent: 3990923 (1976-11-01), Takashina et al.
patent: 4655854 (1987-04-01), Nishiike et al.
patent: 4750949 (1988-06-01), Kobayashi et al.

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