FIELD: electrical engineering.
SUBSTANCE: in zinc plating of sheet, coil surface is coated by fabric made from earth silicon aluminium long ceramic fibers not containing boron and heat-resistant layer that makes isolation and is made from surface-hardening ceramic material containing minor particles of aluminium oxide or earth silicon aluminium or earth silicon aluminium long ceramic fibers.
EFFECT: longer life of induction coil.
7 cl, 1 tbl, 4 dwg
