Effects of enthalpy-enhancing gas on ionic conductivity of atmospheric plasma-sprayed 3.9 mol % yttria-stabilized zirconia electrolyte for 75-106 micron particles

Hann Pyng Wu, Kuan Zong Fung

研究成果: Article同行評審

摘要

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 are used to control the plasma energy. The 3.9YSZ feedstock powder is sieved to obtain particles with sizes in the range of 75-106μm. The electrolyte has the highest hardness and lowest roughness when sprayed at hydrogen gas flow rates of 12 and 7 Lmin11, respectively. The electrolyte bulk density increases and the apparent porosity decreases with increasing hydrogen gas flow rate. A 3.9YSZ electrolyte with an ionic conductivity of 1789μ(cm)11 is obtained at 800°C with a hydrogen gas flow rate of 12 Lmin11. It is controlled by the grain-boundary conductivity. The increase in grain-boundary conductivity is closely related to a low apparent porosity, low migration energy, and a decrease in grain size. Hydrogen gas enhances the growth of columnar grains and suppresses the formation of the monoclinic phase, which is attributed to increased intragrain conductivity.

原文English
頁(從 - 到)400-407
頁數8
期刊Journal of the Ceramic Society of Japan
120
發行號1406
DOIs
出版狀態Published - 2012 10月

All Science Journal Classification (ASJC) codes

  • 陶瓷和複合材料
  • 一般化學
  • 凝聚態物理學
  • 材料化學

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