Effects of Impurity Content on the Sintering Characteristics of Plasma-Sprayed Zirconia
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JTTEE5 16:798–803 DOI: 10.1007/s11666-007-9097-5 1059-9630/$19.00 ASM International
Effects of Impurity Content on the Sintering Characteristics of Plasma-Sprayed Zirconia S. Paul, A. Cipitria, I.O. Golosnoy, L. Xie, M.R. Dorfman, and T.W. Clyne (Submitted April 3, 2007; in revised form June 25, 2007) Yttria-stabilized zirconia powders, containing different levels of SiO2 and Al2O3, have been plasma sprayed onto metallic substrates. The coatings were detached from their substrates and a dilatometer was used to monitor the dimensional changes they exhibited during prolonged heat treatments. It was found that specimens containing higher levels of silica and alumina exhibited higher rates of linear contraction, in both in-plane and through-thickness directions. The in-plane stiffness and the through-thickness thermal conductivity were also measured after different heat treatments and these were found to increase at a greater rate for specimens with higher impurity (silica and alumina) levels. Changes in the pore architecture during heat treatments were studied using Mercury Intrusion Porosimetry (MIP). Fine scale porosity (
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