Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1990-03-01
1991-05-07
Sheehan, John P.
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
148110, 148122, 204 24, 204 585, 2041292, 2041815, H01F 102
Patent
active
050133730
ABSTRACT:
Permanent domain refinement of grain oriented electrical steel strip is obtained in a high speed two-stage process. The process removes the glass in narrow regions which just expose the base metal. An electrolytic etch is then used to deepen the region into the base metal and minimize damage to the remaining glass film. Control of acid concentration and temperature in the electrolytic bath allows a greater increase in productivity. A further feature of the process is the use of permeability measurements to optimize the depth of the etched regions. The improved core loss produced by the process will survive a stress relief anneal.
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M. Yabumoto et al., "Heatproof Domain Refining Method Using Chemically Etched Pits on the Surface of Grain Oriented 3% Si-Fe," IEEE Transactions on Magnetics, Sep. 1987, vol. MAG-23, No. 5, pp. 3062-3064.
Armco Inc.
Bunyard Robert J.
Fillnow Larry A.
Johnson Robert H.
Sheehan John P.
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