Effects of enthalpy-enhancing gas on ionic conductivity of atmospheric plasma-sprayed 3.9YSZ electrolyte for 45-75 μm particles

Hann Pyng Wu, Kuan Zong Fung

Research output: Contribution to journalReview article

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.

Original languageEnglish
Pages (from-to)1014-1023
Number of pages10
JournalJournal of Thermal Spray Technology
Volume22
Issue number6
DOIs
Publication statusPublished - 2013 Aug 1

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All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Materials Chemistry

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