Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Phase Evolution and Thermal Conductivities of (La1-xGdx)2Zr2O7 Oxides for Thermal Barrier Coatings

열차폐코팅용 (La1-xGdx)2Zr2O7 산화물의 상형성과 열전도도

  • Kwon, Chang-Sup (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology) ;
  • Lee, Sung-Min (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology) ;
  • Oh, Yoon-Suk (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology) ;
  • Kim, Hyung-Tae (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology) ;
  • Jang, Byung-Koog (High Temperature Materials Unit, National Institute for Materials Science) ;
  • Kim, Seong Won (Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology)
  • 권창섭 (한국세라믹기술원 엔지니어링세라믹센터) ;
  • 이성민 (한국세라믹기술원 엔지니어링세라믹센터) ;
  • 오윤석 (한국세라믹기술원 엔지니어링세라믹센터) ;
  • 김형태 (한국세라믹기술원 엔지니어링세라믹센터) ;
  • 장병국 (물질.재료연구기구 (NIMS) 선진고온재료유닛트) ;
  • 김성원 (한국세라믹기술원 엔지니어링세라믹센터)
  • Received : 2012.10.23
  • Accepted : 2012.11.21
  • Published : 2012.12.28
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Abstract

With increase in operating temperature of gas turbine for higher efficiency, it is necessary to find new materials of TBC for replacement of YSZ. Among candidate materials for future TBCs, zirconate-based oxides with pyrochlore and fluorite are prevailing ones. In this study, phase structure and thermal conductivities of $(La_{1-x}Gd_x)_2Zr_2O_7$ oxide system are investigated. $(La_{1-x}Gd_x)_2Zr_2O_7$ system are comprised by selecting $La^{3+}/Gd^{3+}$ as A-site ions and $Zr^{4+}$ as B-site ion in $A_2B_2O_7$ pyrochlore structures. With powder mixture from each oxide, $(La_{1-x}Gd_x)_2Zr_2O_7$ oxides are fabricated via solid-state reaction at $1600^{\circ}C$. Either pyrochlore or fluorite or mixture of both appears after heat treatment. For the developed phases along $(La_{1-x}Gd_x)_2Zr_2O_7$ compositions, thermal conductivities are examined, with which the potential of $(La_{1-x}Gd_x)_2Zr_2O_7$ compositions for TBC application is also discussed.

Keywords

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