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C.-S. Seok(석창성),D. H. Kim(김담현),J. M. Lee(이종민),N. G. Jun(전남규),K. B. Park(박기범),K. K. Kim(김기근) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월
Thermal barrier coating (TBC) is technology applied to gas turbine blades to ensure high-temperature safety. When TBC is exposed to high temperature, thermally grown oxide (TGO) is formed due to degradation. TGO weakens the bonding strength between the top coating and bond coating of TBC and causes breakage. So, technology that can predict the growth behavior of TGO and secure durability of TBC is necessary. However, the prediction of the growth behavior of TGO uses an empirical method for each TBC. This method cannot be universally used due to the disadvantage that empirical formula cannot be used when microstructure of TBC is changed. In this study, an isothermal degradation test was performed under various degradation conditions to predict the growth of TGO of TBC manufactured by the Air Plasma Sprayed (APS) method. As a result of measuring the thickness of TGO, the exponential term of the growth equation was affected by the microstructure of the top coating. And the reaction rate constant k can be derived through the Arrhenius equation. Finally, using the two relationships, an equation for predicting the TGO thickness of TBC manufactured by the APS method was derived.