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Effects of Enthalpy-Enhancing Gas on Ionic Conductivity of Atmospheric Plasma-Sprayed 3.9YSZ Electrolyte for 45-75 μm Particles

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Abstract

Enthalpy-enhancing gas is used to optimize the ionic conductivity of atmospheric plasma-sprayed 3.9 mol% yttria-stabilized zirconia (3.9YSZ) electrolyte. In the experiment, three hydrogen gas-flow rates were used to control the plasma energy. The size of the 3.9YSZ feedstock powder was sieved to be set in the range of 45-75 μm. When the hydrogen gas-flow rate was increased, the electrolyte became harder, and the sprayed surfaces became smoother. However, the lowest apparent porosity and the highest bulk density of the electrolyte were obtained at a hydrogen gas-flow rate of 7 L/min. A 3.9YSZ electrolyte with an ionic conductivity of 2860 µ(S/cm) and the lowest dissociation energy was obtained at 800 °C with a hydrogen gas-flow rate of 12 L/min. It was controlled by the intragrain conductivities. A higher hydrogen gas-flow rate enhanced the growth of columnar grains and suppressed the appearance of the monoclinic phase, which led to the greater intragrain conductivities. The increase in grain-boundary conductivities is closely related to the decrease in grain size.

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Acknowledgments

This study was funded by the Taiwan’s National Science Council (Grant NSC 101-3113-E-006-009). The authors gratefully acknowledge the support from the Aero Engine Factory/Aerospace Industrial Development Corporation, Taiwan, and also sincerely thank Professor M. H. Hon for comments on the manuscript.

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  1. Department of Materials Science and Engineering, National Cheng Kung University, 1 Ta-Hsueh Road, Tainan, 70101, Taiwan

    Hann-Pyng Wu & Kuan-Zong Fung

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Correspondence to Hann-Pyng Wu.

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Wu, HP., Fung, KZ. Effects of Enthalpy-Enhancing Gas on Ionic Conductivity of Atmospheric Plasma-Sprayed 3.9YSZ Electrolyte for 45-75 μm Particles. J Therm Spray Tech 22, 1014–1023 (2013). https://doi.org/10.1007/s11666-013-9935-6

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