The Study on Delamination Life of TBC through Burner-Rig Test

초록

Since gas turbines operate under extremely high temperatures, the hot-section parts of gas turbines should be protected from severe environmental conditions. Thermal Barrier Coating (TBC) is a protection technique that lowers the surface temperature of the hotsection parts. To design reliable gas turbines, the delamination life of TBC should be accurately evaluated. This study evaluated the delamination life of TBC by conducting a burner-rig test simulation of thermal fatigue conditions using a hot flame. Two types of TBCs were considered: one with vertical cracks and the other without vertical cracks. To evaluate the effects of pre-isothermal deterioration on thermal fatigue life under flame conditions, burner-rig tests were performed using isothermally deteriorated specimens. The burner-rig tests were conducted until the coating layer was completely delaminated. Using the tests results, predictive equations for delamination life and delaminated TBC area were derived and analyzed.

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