| Pacific Rim Symposium on Surfaces, Coatings and Interfaces (PacSurf 2018) | |
| Plasma Processing | Thursday Sessions |
| Session PS-ThM |
| Session: | Plasma Processing |
| Presenter: | Byung-Koog Jang, Kyushu University |
| Authors: | B.-K. Jang, Kyushu University H.-T. Kim, Korea Institute of Ceramic Engineering and Technology |
| Correspondent: | Click to Email |
Thermal barrier coatings (TBCs) have received a large attention because they increase the thermal efficiency of gas turbine engines by increasing the gas turbine inlet temperature and reducing the amount of cooling air required for the hot section components. Electron beam-physical vapor deposition (EB-PVD) or plasma spray coatings is a widely used technique for depositing thermal barrier coatings (TBCs) on metal substrates for high temperature applications, such as gas turbines, in order to improve the thermal efficiency. High temperature capability of TBCs used in a gas turbine is often degraded by deposits of calcium-magnesium-alumino-silicate (CMAS). The CMAS melts are produced when siliceous minerals (volcanic ash, dust and sand) are ingested with the intake air and deposited on the hot surface of TBCs.
This work describes the thermal conductivity and corrosive properties of 2~8mol%Y2O3-stabilized ZrO2 (YSZ) coatings by EB-PVD and plasma sprayed coatings. The hot corrosion between YSZ coatings and volcanic ash was examined by isothermal heating at 1200°C in air between 10 min and 100hrs. The thickness of corrosive region at top surface of TBCs by the reaction between YSZ coating and volcanic ash was increased with increasing the oxidation time. In addition, the mechanical properties of YSZ TBCs were evaluated by nano indentation.