Abstract
An improvement in the iron loss of grain oriented silicon steel sheet was investigated when using a ceramic coating such as TiN, CrN or TiC produced by ion plating on polished silicon steel sheet. Iron loss W 17 50 ( w ̄ /kg) of silicon steel sheets with a ceramic film showed a dramatic improvement of about 40% in the final magnetic properties concerning magnetic domain refinement. These ceramic-coated silicon steel sheets had the superior properties of high magnetic flux density, low magnetostriction and a high lamination factor. The influence of different PVD coating methods on the magnetic properties was also investigated. The degree of improvement of W 17 50 ( w ̄ /kg) by the HCD method was about twice that by the EB + RF method. Silicon steel sheet TiN-coated by the HCD method had more marked compressive stress sensitivity than that coated by the EB + RF method. In order to clarify the mechanism responsible of the ultra-low iron loss of TiN-coated silicon steel sheet, a direct observation was made of the domain structure obtained by coating with a thin TiN film. The domain structure of the chemically polished area showed an original main domain with large black and white 180 ° domain wall spacings, while that of the TiN-coated area showed marked domain refinement resulting from the strong tensile stress induced by the TiN film.
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