| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Advanced Coatings for Wear and Corrosion Protection
|
| Presentation Title |
New Multidisciplinary Approach for Investigating Hot Corrosion Behavior in Thermal Barrier Coatings |
| Author(s) |
Guanlin Lyu, JunSeong Kim, SeungCheol Yang, Yeon-Gil Jung |
| On-Site Speaker (Planned) |
Guanlin Lyu |
| Abstract Scope |
A new multidisciplinary approach for investigating the corrosion behavior of thermal barrier coatings has been proposed, combining the thermo-gradient mechanical fatigue (TGMF) method with hot corrosion tests. Corrosive salts (Na2SO4; V2O5) of varying concentrations (10–20 mg/cm2) were deposited on the surface of YSZ coating to evaluate the microstructural change during the reaction, via TGMF tests. The tests were conducted at a surface temperature of 1150 °C in 10 min cycles with uniaxial tensile loads of 60 and 100 MPa. It was verified that the corrosion byproduct, ZrV2O7, plays an important role as an intermediate in the collapse of lamellar structures during the reaction, which resulted from the repetitive precipitation of V2O5 and m-ZrO2 from ZrV2O7. The microstructure of corroded YSZ coating exhibited a different degradation mechanism under a thermomechanical environment, compared with the testing under an isothermal atmospheric condition. |