한국분말재료학회지 (Journal of Powder Materials)

  • 제18권6호
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  • Pages.568-574
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  • 2011
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  • 2799-8525(pISSN)
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  • 2799-8681(eISSN)
한국분말재료학회 (*구 분말야금학회) (The Korean Powder Metallurgy & Materials Institute)
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열차폐코팅용 La2(Zr1-xHfx)2O7 산화물의 상형성과 열물성

Phase Evolution and Thermo-physical Properties of La2(Zr1-xHfx)2O7 Oxides for Thermal Barrier Coatings

  • 김성원 (한국세라믹기술원 이천분원 엔지니어링세라믹센터) ;
  • 이성민 (한국세라믹기술원 이천분원 엔지니어링세라믹센터) ;
  • 오윤석 (한국세라믹기술원 이천분원 엔지니어링세라믹센터) ;
  • 김형태 (한국세라믹기술원 이천분원 엔지니어링세라믹센터) ;
  • 장병국 (물질.재료연구기구 (NIMS) 선진고온재료유닛트)
  • Kim, Seong-Won (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 of Materials Science)
  • 투고 : 2011.09.29
  • 심사 : 2011.11.22
  • 발행 : 2011.12.28
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초록

As operating temperatures of engines or turbines continually increase for higher efficiency, significant amounts of researches have been focused on finding new materials, which would be alternatives to conventional yttria-stabilized zirconia (YSZ) for thermal barrier coatings (TBCs). In this study, phase evolution and thermo-physical properties of $La_2(Zr_{1-x}Hf_x)_2O_7$ pyrochlore systems are investigated for TBC applications. $La_2(Zr_{1-x}Hf_x)_2O_7$ systems are comprised by selecting $La^{3+}$ as A-site ions and $Zr^{4+}/Hf^{4+}$ as B-site ions in $A_2B_2O_7$ pyrochlore structures. For the developed phases in $La_2(Zr_{1-x}Hf_x)_2O_7$ compositions, thermo-physical properties such as thermal conductivity, thermal expansion coefficient are examined. The potential of these $La_2(Zr_{1-x}Hf_x)_2O_7$ compositions for TBC application is also discussed.

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