A cumulative oxide growth model considering the deterioration history of thermal barrier coatings

• Published in: Corrosion science Vol. 182; p. 109273
• Main Authors: Kim, Keekeun, Kim, Damhyun, Park, Kibum, Yun, Junghan, Jun, Namgyu, Seok, Chang-Sung
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier Ltd 15.04.2021; Elsevier BV
• Subjects: Coatings; Deterioration; Gas turbines; Growth models; Oxidation; Oxidation model; Oxidation rate; Temperature history; Thermal barrier coatings; Thermal cycle test; Thermally grown oxide; Thermal cycle test; Thermally grown oxide; Temperature history; Oxidation model; Oxidation rate
• ISSN: 0010-938X; 1879-0496
• DOI: 10.1016/j.corsci.2021.109273

[Display omitted] •The oxidation rate of TBCs is proportional to the function of temperature and (1/h)n.•n is related to the characteristics of TBCs and it is constant even when there are temperature changes.•The oxide accumulated at various temperatures can be calculated through equivalent conversion.•The thermal cycle test with a large temperature change over time have different oxidation behavior.•The oxides could be predicted by dividing the temperature section and accumulating the oxides. In this study, we developed a modified oxidation model to explain the oxidation behavior of thermal barrier coatings (TBCs) of gas turbines and predicted accumulated oxides under complex temperature conditions. The applicability of the method was verified using a deterioration test between 1100 and 1200 °C. In addition, the oxidation model was simulated for large temperature changes over time, and the results were compared with the experimental results. Consequently, the oxidation of TBCs could be predicted using the deterioration history, and the oxidative damage could be compared between tests in different deterioration cycles.