Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : October 08, 2016 - October 10, 2016
TBC (Thermal Barrier Coating) plays an important role to protect structural components from high temperature environment of gas turbines. The TBC consists of ceramic top coat and metallic bond coat, deteriorate by the high temperature operating condition. CMAS (CaO-MgO-Al2O3-SiO2) infiltration into the top coat is also one of degradation mode for TBCs. Damage mechanism associated with the CMAS are significant in the novel turbine system, which operates at higher temperatures than the melting point of CMAS component. In this study, CMAS infiltration tests were conducted. Delamination of the top coat was observed under the CMAS infiltrated layer. The delamination path varied with coating process as well as CMAS infiltration rate. Structural analysis was also conducted. The result indicated that a characteristic stress state that can promote the delamination was developed around the CMAS infiltrated top coat.
