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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.120  No.1406 (October) (2012)  >  pp.400-407

Journal of the Ceramic Society of Japan
<<Previous article Vol.120  No.1406 (October) (2012)   pp.400 - 407 Next article>>

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 WU1), Kuan-Zong FUNG1)
1) Department of Materials Science and Engineering, National Cheng Kung University

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 75–106 µm. The electrolyte has the highest hardness and lowest roughness when sprayed at hydrogen gas flow rates of 12 and 7 Lmin−1, 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 1789 µ(Ω cm)−1 is obtained at 800°C with a hydrogen gas flow rate of 12 Lmin−1. 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.


Keyword:
Enthalpy-enhancing gas, Conductivity, Plasma-sprayed electrolyte, Yttria-stabilized zirconia

Received: March 26, 2012
Accepted: August 04, 2012 , Published online: October 01, 2012
Copyright © 2012 The Ceramic Society of Japan

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