Method of refining magnetic domains of electrical steels using p

Details Method of refining magnetic domains of electrical steels using p Method of refining magnetic domains of electrical steels using p

1988-06-10

1990-03-27

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148122, H01F 104

Patent

active

049117661

ABSTRACT:
A method is provided for refining the magnetic domain wall spacing of grain-oriented silicon steel having a forsterite base coating thereon by removing portions of the base coating to expose a pattern of the underlying silicon steel, providing the exposed silicon steel with an environment selected from the group of phosphorus and phosphorus-bearing compounds, and then annealing the exposed steel, which is free of thermal and plastic stresses, in the phosphorus environment in a reducing atmosphere to produce in the steel a line of permanent bodies containing a phosphorus-bearing compound to effect heat resistant domain refinement and reduced core loss.
A semi-finished sheet product of final texture annealed grain-oriented silicon steel is also provided.

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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