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Vol.42, No.10, 815 ~ 821, 2004
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| Title |
| Degradation of Thermal Barrier Coatings with NiCoCrAlY and NiAl Bond Coats by Thermal Cycling at High Temperature |
| 김길무 Gil Moo Kim , 구성모 Seong Mo Koo , G. H. Meier , F. S. Pettit |
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| 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) |
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| Key Words |
| Thermal barrier coating, Thermally grown oxide, NiAl, NiCoCrAlY, Thermal cycling |
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