Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Effect of Pt on the High Temperature Stability of NiCoCrAlY or NiAl Bond Coat in the Thermal Barrier Coating System

NiCoCrAlY 및 NiAl bond coat를 사용한 Thermal Barrier Coating의 고온안정성에 미치는 Pt의 영향

  • Ku Seongmo (School of Advanced Materials Engineering, Chungnam National University) ;
  • Kim Gil Moo (School of Advanced Materials Engineering, Chungnam National University)
  • 구성모 (충남대학교 신소재공학부) ;
  • 김길무 (충남대학교 신소재공학부)
  • Published : 2005.06.01
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Abstract

High temperature oxidation behavior of thermal barrier coating (TBC) system (IN738 substrate + NiCoCrAlY or NiAl bond coat with or without Pt + yttria stabilized zirconia) prepared by air plasma spray (APS) process has been studied in order to understand the effect of Pt addition to bond coat on the stability of TBC system. Specimens were oxidized in thermal cycling and isothermal oxidation test at $1100^{\circ}C$. The Pt addition in TBC system with NiCoCrAlY bond coat showed a longer life time compared to that without addition of Pt. Pt addition to TBC system is believed to help the formation of more stable thermally grown oxide, $Al_2O_3$, at the TBC/bond coat interface, leading to a longer lifetime of TBC system.

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