Method of forming a forsterite insulating film on the surface of

Details Method of forming a forsterite insulating film on the surface of Method of forming a forsterite insulating film on the surface of

1979-10-19

1981-02-10

Lawrence, Evan K.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148 27, 148 315, C23C 304

Patent

active

042499666

ABSTRACT:
A high adhesion uniform forsterite insulating film can be formed on the surface of a grain-oriented silicon steel sheet by the application of an annealing separator consisting mainly of magnesia having a narrow activity distribution defined by the citric acid activity of the magnesia which varies depending upon the variation of final reaction ratio of the magnesia as determined by the method for measuring the citric acid activity of magnesia, where the final reaction ratio of the magnesia is the ratio of that amount of the magnesia which finally reacts with citric acid to the total amount of magnesia mixed with the citric acid.

REFERENCES:
patent: 3186867 (1965-06-01), Forslund et al.
patent: 3841925 (1974-10-01), Steger
patent: 4168189 (1979-09-01), Haselkorn

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