The study on delamination life of TBC through burner-rig test

• Published in: International journal of precision engineering and manufacturing Vol. 18; no. 4; pp. 555 - 560
• Main Authors: Yun, Junghan, Kim, Yongseok, Lee, Jeong-Min, Song, Hyunwoo, Wee, Sunguk, Koo, Jae-Mean, Lee, Young-Ze, Seok, Chang-Sung
• Format: Journal Article
• Language: English
• Published: Seoul Korean Society for Precision Engineering 01.04.2017; Springer Nature B.V
• Subjects: Delamination; Engineering; Industrial and Production Engineering; Materials Science; Regular Paper; Thermal barrier coatings; Burner-rig test; Delamination life; Thermally grown oxides; Thermal barrier coating
• ISSN: 2234-7593; 2005-4602
• DOI: 10.1007/s12541-017-0066-8

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 hot-section 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.