Electrical steel sheet with layer improving electrical insulation and method for its manufacture
A technology of electrical steel sheet and electrical insulation, applied in manufacturing tools, metal material coating process, coating and other directions, can solve the problems of strong corrosion of electrical steel sheet, unsuitable application of electrical steel sheet and its coating etc.
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[0017] The figure shows an electrical steel sheet 11 , the upper side 12 and the lower side 13 of which are each provided with a layer 14 of tantalum oxide. This layer 14 rests on a diffusion region 15 which has a common interface 16 with the tantalum oxide layer 12 . After this interface, the concentration of tantalum in the diffusion zone is well over 50%. Towards the interior of the electrical steel sheet 11, the concentration decreases until the concentration is 0% by weight. The boundary between the actual electrical steel sheet 11 and the diffusion zone 15 is therefore not really shown. In this figure, however, regions are shown in which the concentration of tantalum in the structure of the electrical steel sheet 11 exceeds 50%.
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