Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Effect of Composition of Bond Coating on the Durability of the Plasma Sprayed $\textrm{ZrO}_2$-$\textrm{CeO}_2$-$\textrm{Y}_2\textrm{O}_3$ Thermal Barrier Coating

금속결합층의 조성이 $\textrm{ZrO}_2$-$\textrm{CeO}_2$-$\textrm{Y}_2\textrm{O}_3$ 단열층의 내구성에 미치는 영향

  • Kim, Hye-Seong (Metals Division, Korea Institute of Science and Thchnology) ;
  • Kim, Byeong-Hui (Division of Materials Engineering, Chungnam National University) ;
  • Seo, Dong-Su (Division of Materials Engineering, Chungnam National University)
  • 김혜성 (한국과학기술연구원 금속연구부) ;
  • 김병희 (충남대학교 공과대학 재료공학과) ;
  • 서동수 (충남대학교 공과대학 재료공학과)
  • Published : 1999.01.01
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Abstract

The effect of alloy compositions of the bond coating on the plasma sprayed-thermal barrier coatings was investigated. The performance of the coating composed of Rene80/NiCrAl/ZrO$_2$-CeO$_2$-Y$_2$O$_3$ and Rene80/CoNiCrAlY/ZrO$_2$-CeO$_2$-Y$_2$O$_3$was evaluated by isothermal and thermal cyclic test in an ambient atmosphere at 115$0^{\circ}C$. The failure of Rene80/NiCrAl/ZrO$_2$-CeO$_2$-Y$_2$O$_3$ coatings was occurred at the bond coating/ceramic coating interface while Rene80/CoNiCrAlY/ZrO$_2$-CeO$_2$-Y$_2$O$_3$ coating was failed at the substrate/bond coating interface after thermal cyclic test. The lifetime of Rene80/NiCrAl/ZrO$_2$-CeO$_2$-Y$_2$O$_3$coatings was longer than Rene80/CoNiCrAlY/ZrO$_2$-CeO$_2$-Y$_2$O$_3$coating. The oxidation rate of the NiCrAl bond coating examined by TGA was lower than CoNiCrAlY bond coatings. In summary, these results suggest that Rene80/CoNiCrAlY/ZrO$_2$-CeO$_2$-Y$_2$O$_3$system as thermal barrier coating be not suitable considering the durability of the coating layer for high temperature oxidation and thermal stress.

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