Magnesia coating and process for producing grain oriented electr

Details Magnesia coating and process for producing grain oriented electr Magnesia coating and process for producing grain oriented electr

1995-06-05

1996-08-20

Sheehan, John

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148110, H01F 104

Patent

active

055475191

ABSTRACT:
The present invention provides an annealing separator composition for coating grain oriented electrical steel prior to the final high temperature anneal for secondary grain growth. The magnesia based coating contains at least 20% silica on a water free basis. The large silica additions limit the interface between the coating and the base metal and results in a thick glass which is easily removed. The magnesia coating develops excellent magnetic properties and does not require the normal strong acid cleaning or special abrasive means to remove the glass film which forms. The bare electrical steel, which may be coated to enhance the punching properties, has improved the die life because the hard glass film has been substantially removed.

REFERENCES:
patent: 4168189 (1979-09-01), Haselkorn et al.
patent: 4179315 (1979-12-01), Miller
patent: 4207123 (1980-06-01), Reynolds et al.
patent: 4344802 (1982-08-01), Haselkorn
patent: 4443425 (1984-04-01), Sopp et al.
patent: 4775340 (1988-10-01), Tanaka et al.

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