Method of refining magnetic domains of barrier-coated electrical

Details Method of refining magnetic domains of barrier-coated electrical Method of refining magnetic domains of barrier-coated electrical

1988-06-10

1990-02-27

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148111, H01F 104

Patent

active

049043145

ABSTRACT:
A method is provided for domain refinement of final texture annealed grain-oriented silicon steels by applying to the base coating a barrier coating for sealing the forsterite, removing portions of the base coating to expose a pattern of the underlying silicon steel, applying a metallic contaminant to the steel at least in the areas of the exposed steel which is free of thermal and plastic stresses, and thereafter annealing the steel having the barrier coating and contaminant thereon at time and temperature in a reducing atmosphere to diffuse sufficient and controlled amounts of the metallic contaminant and an element from the barrier coating into the exposed steel to produce a permanent pore to effect heat resistant domain refinement and reduced core loss.

REFERENCES:
patent: 3990923 (1976-11-01), Takashina et al.
patent: 4203784 (1980-05-01), Kuroki et al.

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