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Preparation and Properties of Stable Suspensions of ZrO2–Y2O3 Powders with Different Particle Sizes for Electrophoretic Deposition

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Abstract

This paper presents a study of nonaqueous suspensions based on ZrO2–8 mol % Y2O3 (8YSZ) powders and describes the use of the powders for producing thin-film coatings on a La2NiO4 (LNO) substrate by electrophoretic deposition (EPD). Stable suspensions for EPD have been prepared using 8YSZ powders differing in morphology and particle size: nanopowder (YSZ_L) produced by a laser evaporation–condensation process and commercially available powder (YSZ_T) (Tosoh, Japan). Ultrasonic processing has been found to have different effects on the particle size composition of the YSZ_L and YSZ_T suspensions. The two types of suspension have been shown to differ significantly in the kinetics of the deposition current at constant voltage: during deposition from the YSZ_L suspension, the current was observed to rise, whereas in the case of the YSZ_T suspension the current decreased markedly with deposition time. The YSZ_L film has been shown to be denser than the YSZ_T film. After sintering at 1350°C, it consisted of completely formed grains ranging in size from 1 to 5 μm. To remove surface pores in YSZ_T coatings, they should be sintered at a temperature of 1450°C.

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ACKNOWLEDGMENTS

We are grateful to A.P. Safronov (Ural Federal University, Yekaterinburg) for his assistance in determining the particle size in the suspensions and to A.A. Kudryavtsev (OOO Teskan, St. Petersburg) and A.S. Farlenkov (Institute of High-Temperature Electrochemistry, Ural Branch, Russian Academy of Sciences, Yekaterinburg) for performing the microstructural work.

Part of this work was carried out using equipment at the Shared Research Facilities Center, Institute of Electrophysics, Ural Branch, Russian Academy of Sciences, and at the Composition of Compounds Shared Access Center, Institute of High-Temperature Electrochemistry, Ural Branch, Russian Academy of Sciences.

Funding

This work was supported by the Russian Federation Ministry of Science and Higher Education (state research target for the Institute of Electrophysics, Ural Branch, Russian Academy of Sciences; SOFC Technology Development subject area at the Institute of High-Temperature Electrochemistry, Ural Branch, Russian Academy of Sciences).

We gratefully acknowledge the comprehensive support of the Russian Federation Government (02.A03.21.0006, Act 211).

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Authors and Affiliations

  1. Institute of Electrophysics, Ural Branch, Russian Academy of Sciences, 620016, Yekaterinburg, Russia

    E. G. Kalinina

  2. Ural Federal University, 620002, Yekaterinburg, Russia

    E. G. Kalinina & E. Yu. Pikalova

  3. Institute of High-Temperature Electrochemistry, Ural Branch, Russian Academy of Sciences, 620137, Yekaterinburg, Russia

    E. Yu. Pikalova

Authors
  1. E. G. Kalinina
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  2. E. Yu. Pikalova
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Correspondence to E. G. Kalinina.

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Translated by O. Tsarev

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Kalinina, E.G., Pikalova, E.Y. Preparation and Properties of Stable Suspensions of ZrO2–Y2O3 Powders with Different Particle Sizes for Electrophoretic Deposition. Inorg Mater 56, 941–948 (2020). https://doi.org/10.1134/S0020168520090095

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