Effect of MCrAlY bond coat surface temperature on thermal cyclic lifetime of plasma-sprayed thermal barrier coatings

Wednesday, May 13, 2015
Exhibit Halls A&B (Long Beach Convention and Entertainment Center)
Mr. Hui Dong , State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, China
Prof. Chang-Jiu Li , State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, China
Mr. Hang Ding , State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, China
Dr. Xiao-Tao Luo , State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, China
Prof. Guan-Jun Yang , State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, China
Prof. Cheng-Xin Li , State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, China
Gradient thermal cycling test was performed on thermal barrier coatings (TBCs) to examine the influence of the temperature at YSZ /bond coat interface on the thermal cyclic lifetime. The maximum bond coat surface temperature was maintained at 900oC, 950oC and 1000oC, respectively. Each thermal cycling test included 120 s heating to a peak YSZ surface temperature of 1150oC and 120 s cooling by air jets to a temperature of about 100oC. Results indicated that the lifetime TBCs was significantly affected by the temperature of bond coat surface. With the TBC of an initial TGO at a thickness of 3.9 mm, the thermal cyclic lifetime was reduced from about 7500 cycles to less than 3000 cycles when the bond coat surface temperature was increased from 900oC to 1000oC. The final TGO thickness at the failure of TBC samples was measured to clarify the main factors which dominate the failure of TBC.
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