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Radiofrequency and Microwave Dielectric Properties of Plasma Sprayed and Annealed Thick Layers of Titanium Dioxide

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Abstract

Titanium dioxide (TiO2) was plasma sprayed using a high feed-rate spray system with hybrid water–argon stabilization torch (WSP-H). TiO2 powder agglomerated from nanometric particles was used as the feedstock. The produced coating had thickness over 4 mm, to be comparable with bulk ceramic bodies. The deposit was removed from the substrate and annealed in air to reoxidize the oxygen deficient as-sprayed titania and to obtain material with a proper dielectric behavior. Besides the microstructure studies, radiofrequency dielectric spectroscopy and microwave dielectric spectroscopy were in the focus of investigation. The approach to annealing of an extremely thick coating is studied: The significance of annealing of a large-area thick coating is discussed, as the role of grain interior and grain boundaries in the charge transport is influenced. Relative permittivity εr 94 and the Q*f product 12,800 GHz were reached at frequency 4 GHz, whereas the frequency response under 1 MHz was mapped continuously and the values (i.e., low and stable loss tangent) confirmed that a sprayed and air-annealed TiO2 is able to approach or also overperform dielectric parameters typical for TiO2 sintered bulk.

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Acknowledgments

This research was supported by the Grant Agency of the Czech Technical University in Prague, No. SGS18/070/OHK3/1T/13. Jan Petrášek (FEE CTU Prague) is acknowledged for the elevated temperature dielectric measurement.

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Authors and Affiliations

  1. Department of Electrotechnology, Faculty of Electrical Engineering, Czech Technical University in Prague, Technická 2, 166 27, Prague 6, Czech Republic

    Pavel Ctibor, Josef Sedláček & Václav Papež

  2. Institute of Plasma Physics ASCR, v.v.i, Za Slovankou 3, Prague, Czech Republic

    Pavel Ctibor & František Lukáč

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  1. Pavel Ctibor
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  2. Josef Sedláček
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Correspondence to Pavel Ctibor.

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Ctibor, P., Sedláček, J., Papež, V. et al. Radiofrequency and Microwave Dielectric Properties of Plasma Sprayed and Annealed Thick Layers of Titanium Dioxide. J Therm Spray Tech 29, 1718–1727 (2020). https://doi.org/10.1007/s11666-020-01065-y

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