Method for forming forsterite insulating film on an oriented sil

Details Method for forming forsterite insulating film on an oriented sil Method for forming forsterite insulating film on an oriented sil

1978-11-02

1980-02-26

Rutledge, L. Dewayne

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148 121, 148 131, 148 27, 148 315, H01F 104

Patent

active

041904699

ABSTRACT:
Forsterite insulating films having a high adhesion on an oriented silicon steel sheet are formed by a method wherein an annealing separator consisting mainly of magnesia is applied on surfaces of the oriented silicon steel sheet and the steel sheet is wound up into a coil-form and then annealed at high temperatures to form forsterite insulating films, which is characterized by that the content of water carried into the coil together with the annealing separator is controlled depending upon the content of CaO component carried into the coil together with the annealing separator.

REFERENCES:
patent: 2906645 (1959-09-01), Carpenter et al.
patent: 3583887 (1971-06-01), Steger et al.
patent: 3676227 (1972-07-01), Matsumoto et al.
patent: 4037019 (1977-07-01), Steger

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