ULTRA-LOW IRON LOSS UNIDIRECTIONAL SILICON STEEL SHEET

摘要

An ultra-low iron loss unidirectional silicon steel sheet suitable for use as a core material for transformers and other electrical devices. It is far superior to conventional unidirectional silicon steel sheets in iron loss and space factor by forming two or more layers of ceramic tension films made of a nitride and/or a carbide over a smoothened surface or a grooved surface of a unidirectional silicon steel finished annealed sheet in such a way that the thermal expansion coefficient of the ceramic tension films decreases toward the outside and the outermost ceramic tension film is an electrical insulator.