Abstract
Thermal barrier coating (TBC) had been already applied to the hot section parts of gas turbines, such as a bucket and a combustor. It is thought that TBCs are in dispensable for the gas turbines along with cooling technology. It is now desired to give higher durability to TBCs so as to endure higher combustion temperature. The object of this study is to clearify the oxidation behavior of Atmospheric Plasma Spraying TBC at high-temperature.
The experimental results showed that the oxidation layer was formed mainly of alumina at the interface between the yttria stabilized zirconia top-coating and MCrAlY bond-coating. There was a tendency that the oxide layer growth increased with increasing heating temperature and heating time. It was also indicated that the oxide layer growth followed a 0.45 power time law. The Arrhenius type temperature dependence for the rate constant of oxide layer growth was confirmed. Finally, the long time estimation of oxide layer growth behavior was conducted by the simulation analysis.
