Electrical insulation properties of APS oxide coatings

Electrical insulation properties of APS oxide coatings Susan Conze, Anna Greiner, Sebastian Stark, Lutz-Michael Berger Session: Fundamentals / R&D: Characterization and New Evaluation Techniques Length: 149 words The use of thermally sprayed oxide coatings as electrically insulating coatings belongs to their traditional applications. However, energy transition and electromobility are strong driving forces for new applications that necessitate increased performance including higher reliability. Establishing such new applications requires a deep knowledge of the composition-structure-property relationships. This, in turn, can only be achieved with reproducible and, ideally, standardized measurements of electrical properties like insulation resistance and dielectric breakdown voltage under realistic conditions. Therefore, a newly developed automated test stand is used for systematic investigation of the electrical properties with statistical validation under controlled humidity (< 10 % to 75 %) in this contribution. In particular, the electrical properties of different insulating APS oxide coatings, including Al2O3, high purity Al2O3, Al2O3/3% TiO2, Al2O3/13%TiO2, MgAl2O4, Y2O3, Cr2O3 are presented and critically discussed in view of the feedstock powder and coating properties like chemical composition and impurities, coating thickness and porosity.