| Title |
Degradation of Thermal Barrier Coatings with NiCoCrAlY and NiAl Bond Coats by Thermal Cycling at High Temperature |
| Authors |
김길무(Gil Moo Kim); 구성모(Seong Mo Koo); (G. H. Meier); (F. S. Pettit) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
Thermal barrier coating; Thermally grown oxide; NiAl; NiCoCrAlY; Thermal cycling |
| Abstract |
The effect of thermal cycling on the degradation of thermal barrier coatings has been studied. A Ni-based superalloy substrate was coated with an Al-rich NiAI or NiCoCrAlY bond coat and yttria stabilized zirconia. These specimens were exposed to two types of thermal cyclings, namely, 10 minute thermal cycling and 1 hour thermal cycling, at 1100℃ in the air. The TBC system with NiCoCrA1Y bond coat showed a longer life time in 10 minute thermal cycling compared to that with NiAI, while the TBC system with NiAl showed a longer life time in 1 hour thermal cycling compared to that with NiCoCrAlY. These degradation behaviors will be discussed in detail. (Received June 15, 2004) |