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Electrical and Optical Properties of Plasma-Sprayed Yttria

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Abstract

The aim of this study is to investigate electrical properties of Yttria which is known for its outstanding thermal and chemical stabilities. Y2O3 coatings deposited on carbon steel substrates were prepared using an atmospheric plasma-spray system. Three sets of samples were sprayed and characterized in order to determine their microstructural, electrical, and optical aspects of sensitivity to spray distance. All coatings contained only cubic Y2O3 phase and exhibited weak influence of spray distance variations on electrical properties. Relative permittivity values varied between 9.3 and 11.2 in the whole frequency range (50 Hz to 1 MHz) for all samples. Temperature dependence of electrical properties in the range of 20 °C to 120 °C showed good stability of measured values. Electrical resistivity was in the order of magnitude up to 10 × 1012 Ω m for all the samples. SEM observations, porosity, and reflectivity measurements brought an expanded view of microstructural changes at different spray distances.

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Acknowledgments

The authors thank Dr. Zdenek Pala for XRD analysis, Dr. Radek Musalek for SEM observations, and Mr. Rostislav Hribal for the help with electrical properties’ measurements. The authors also thank Prof. Sanjay Sampath for providing the spray facilities at the Center for Thermal Spray Research, Stony Brook, NY. The electrical tests were supported by the Czech Science Foundation under the Grant No. 14-36566G Multidisciplinary research center for advanced materials.

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Authors and Affiliations

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

    Jiri Kotlan

  2. Department of Materials Science & Engineering, Stony Brook University, Stony Brook, NY, 11794-2275, USA

    Ramachandran Chidambaram Seshadri

  3. Materials Engineering Department, Institute of Plasma Physics CAS, v.v.i., Za Slovankou 3, Prague 8, Czech Republic

    Pavel Ctibor

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  1. Jiri Kotlan
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  2. Ramachandran Chidambaram Seshadri
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  3. Pavel Ctibor
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Correspondence to Pavel Ctibor.

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Manuscript submitted August 22, 2017.

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Kotlan, J., Seshadri, R.C. & Ctibor, P. Electrical and Optical Properties of Plasma-Sprayed Yttria. Metall Mater Trans A 50, 504–511 (2019). https://doi.org/10.1007/s11661-018-4994-4

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