| Abstract |
| Thermal barrier coating(TBC) is generally applied to turbine engines in order to protect metallic components from high temperatures, and thus, to increase the combustion efficiency. Most widely used yttria stabilized zirconia YSZ;ZrO_(2)-8 wt.％Y_(2)O_(3) have the poor resistance to hot corrosion under the operating conditions of low quality fuel and sea or desert environments. In order to overcome this problem, ceria stabilized zirconia (CSZ; ZrO_(2)-25wt.％CeO_(2)-2.5wt.％Y_(2)O_(3) has been suggested as a new protective materials for the TBC. In this study, Duplex type YSZ- and CSZ-TBCs with similar microstructure were fabricated by detonation gun spraying. High temperature corrosion tests of the TBC specimens, on which NaVO_(3) salt were pasted, were performed at 900°C. Results showed that CSZ TBCs is more resistant to NaVO_(3) salt than YSZ TBCs in terms of phase stability and overall damage by salt. Studies in effects of microstructure indicate that YSZ and CSZ TBCs are degraded by different behavior of stabilizer during the tests and microstructure of TBCs, such as pores, micro cracks and splat boundaries, plays an important role in hot corrosion. From the results stepwise microscopic degradation mechanism of zirconia based TBCs by hot corrosion was discussed. |
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| Key Words |
| Thermal barrier coating, Hot corrosion, YSZ, CSZ |
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