Abstract
We tested a facile surface coating procedure using 3-aminopropyltriethoxysilane (APTES) as a coating reagent to insulate the surface of Vitroperm 800. Both Raman spectroscopy and X-ray photoelectron spectroscopy (XPS) confirmed the presence of iron oxides on the surface of the Vitroperm. The higher oxidation state of Fe3+ (Fe2O3) was preferably formed over the Fe2+ state (Fe3O4) when the organosilane concentration was increased. XPS revealed that a coating solution concentration >5 mM was required to obtain an insulating silicon oxide layer similar to SiO2. The presence of these oxides on the surface of Vitroperm elevated the surface resistivity into the 106 Ω-cm range without having a detrimental impact on the direct current (DC) magnetic flux density or alternating current (AC) permeability. The insulating coating slightly decreased the DC coercivity, which is related to hysteresis loss. However, the increase in surface resistivity should decrease eddy current losses.
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