Abstract No.:	7211
Scheduled at:	Wednesday, May 04, 2022, Hall D 4:05 PM Young Professionals Session
Title:	Thermally sprayed Al2O3 ceramic coatings for electrical insulation applications
Authors:	Paul Junge* / Technische Universität Berlin, Germany Moritz Greinacher / Department High Voltage Engineering, Technische Universität Berlin, Germany Delf Kober/ Department Ceramic Materials, Technische Universität Berlin, Germany Patrick Stargardt/ Department Advanced Technical Ceramics, Bundesanstalt für Materialforschung und -prüfung (BAM), Germany Christian Rupprecht/ Department Coating Technology, Technische Universität Berlin, Germany
Abstract:	Thermal spraying enables a fast and propelling way to additively deposit various ceramics as electrical insulators, which are used in conditions where polymers are not suitable. Alumina (Al2O3) is among the most employed materials in the coating industry, since it exhibits good dielectric properties, high hardness, high melting point, while still being cost-effective. Various parameters (e.g. feedstock type, plasma gas mixture, plasma power) significantly influence the resulting coating in terms of microstructure, porosity, crystallinity and degree of un-or molten particles. As a consequence these parameters need to be investigated to estimate the impact on the electrical insulating properties of thermally sprayed alumina. This study focuses on the development of a novel electrical insulation coating from Al2O3 feedstock powders deposited via atmospheric plasma spray (APS). The microstructure, porosity and corresponding crystallographic phases have been analysed with optical microscopy, XRD and SEM images. To achieve an understanding of the parameters influencing the electrical insulation performance of the manufactured coatings, an in-depth analysis of the fundamental dielectric parameters (e.g. DC resistance, dielectric loss tangent, permittivity) is presented.

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