Abstract
The oxide layer formed on the surface of a grain oriented silicon steel was characterized by SEM and EDS. 3% Si steel substrates were coated by two types of slurries: one formed by MgO and water and other formed by MgO, water and SrSO4. The ceramic films were evaluated by SEM, EDS and X-ray diffraction. Depth profiles of Fe, Si and Mg were obtained by GDS. The magnetic core losses (at 1.7 Tesla, 60 Hz) of the coated steel samples were evaluated as well. The use of MgO containing strontium reduced the volume fraction of forsterite particles beneath the outermost ceramic layer. It was observed a reduced magnetic core loss with the use of the slurry with MgO containing strontium.
Highlights
The grain oriented silicon steel has been used as a magnetic core material of electrical equipment and is required to have low core loss, high permeability and proper dielectric coating[1,2]
In order to present low core loss and high magnetic permeability the silicon steel must develop during the secondary recrystalization grains with a {110} (Goss) orientation[1,3]
The objective of this work is to evaluate the influence of a MgO containing 1% Sr on the structure of the ceramic film formed on the surface of a grain oriented silicon steel
Summary
The grain oriented silicon steel has been used as a magnetic core material of electrical equipment and is required to have low core loss, high permeability and proper dielectric coating[1,2]. In order to present low core loss and high magnetic permeability the silicon steel must develop during the secondary recrystalization (with the aid of MnS as an inhibitor) grains with a {110} (Goss) orientation[1,3]. The ceramic film (forsterite) is formed from a reaction between the steel surface and the magnesia. The objective of this work is to evaluate the influence of a MgO containing 1% Sr (as SrSO4) on the structure of the ceramic film formed on the surface of a grain oriented silicon steel
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