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Comparative Study of the Electrical Properties and Characteristics of Thermally Sprayed Alumina and Spinel Coatings

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Abstract

In this study, APS and HVOF processes have been used to prepare alumina (Al2O3) and magnesium spinel (MgAl2O4) coatings designed for insulating applications. The electrical characteristics, i.e., dielectric strength and electrical resistance (electrical resistivity) were investigated using different methods: dielectric breakdown test, direct current (DC) measurements, and electrochemical impedance spectroscopy (EIS). The electrical resistance was measured at room temperature at different relative humidity (RH) levels (from 6% RH to 95% RH) as well as at 200 °C. The coating microstructure, phase composition, and water vapor sorption were studied. Differences in the electrical insulating properties due to the different coating system characteristics are discussed. Of the coatings and conditions investigated in this study, the HVOF spinel coatings showed superior dielectric breakdown strength and electrical resistance stability at high humidity levels.

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Acknowledgments

This study was part of the DKG (German Ceramic Society)/AiF research project “Maßgeschneiderte keramische Schichtheizelemente, hergestellt durch thermisches Spritzen” (Tailor-made ceramic coating heating elements obtained by thermal spraying), AiF No. 15.695BR, funded via AiF (Arbeitsgemeinschaft industrieller Forschungsvereiningungen) by the Federal Ministry of Economics and Technology. The authors gratefully acknowledge this funding. Thanks are also due to our colleagues Ms. B. Wolf for metallographic sample preparation, Ms. S. Raschke for SEM micrographs, and Ms. S. Saaro for XRD analysis.

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Authors and Affiliations

  1. Fraunhofer Institute for Material and Beam Technology (Fh-IWS), Winterbergstrasse 28, Dresden, 01277, Germany

    Filofteia-Laura Toma, Stefan Scheitz & Lutz-Michael Berger

  2. Fraunhofer Institute for Ceramic Technologies and Systems (Fh-IKTS), Winterbergstrasse 28, Dresden, 01277, Germany

    Viktar Sauchuk, Mihails Kusnezoff & Sven Thiele

Authors
  1. Filofteia-Laura Toma
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  2. Stefan Scheitz
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  3. Lutz-Michael Berger
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Correspondence to Filofteia-Laura Toma.

Additional information

This article is an invited paper selected from presentations at the 2010 International Thermal Spray Conference and has been expanded from the original presentation. It is simultaneously published in Thermal Spray: Global Solutions for Future Applications, Proceedings of the 2010 International Thermal Spray Conference, Singapore, May 3-5, 2010, Basil R. Marple, Arvind Agarwal, Margaret M. Hyland, Yuk-Chiu Lau, Chang-Jiu Li, Rogerio S. Lima, and Ghislain Montavon, Ed., ASM International, Materials Park, OH, 2011.

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Toma, FL., Scheitz, S., Berger, LM. et al. Comparative Study of the Electrical Properties and Characteristics of Thermally Sprayed Alumina and Spinel Coatings. J Therm Spray Tech 20, 195–204 (2011). https://doi.org/10.1007/s11666-010-9580-2

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