Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Fabrication and Characterization of Ceramics and Thermal Barrier Coatings of Lanthanum Zirconate with Reduced Rare-earth Contents in the La2O2-ZrO2 System

희토류 저감형 란타눔 지르코네이트(La2O2-ZrO2계) 세라믹스와 열차폐코팅의 제조 및 특성평가

  • Kwon, Chang-Sup (Engineering Ceramic Team, Korea Institute of Ceramic Engineering and Technology) ;
  • Lee, Sujin (Engineering Ceramic Team, Korea Institute of Ceramic Engineering and Technology) ;
  • Lee, Sung-Min (Engineering Ceramic Team, Korea Institute of Ceramic Engineering and Technology) ;
  • Oh, Yoon-Suk (Engineering Ceramic Team, Korea Institute of Ceramic Engineering and Technology) ;
  • Kim, Hyung-Tae (Engineering Ceramic Team, Korea Institute of Ceramic Engineering and Technology) ;
  • Jang, Byung-Koog (High Temperature Materials Unit, National Institute for Materials Science (NIMS)) ;
  • Kim, Seongwon (Engineering Ceramic Team, Korea Institute of Ceramic Engineering and Technology)
  • 권창섭 (한국세라믹기술원 이천분원 엔지니어링세라믹팀) ;
  • 이수진 (한국세라믹기술원 이천분원 엔지니어링세라믹팀) ;
  • 이성민 (한국세라믹기술원 이천분원 엔지니어링세라믹팀) ;
  • 오윤석 (한국세라믹기술원 이천분원 엔지니어링세라믹팀) ;
  • 김형태 (한국세라믹기술원 이천분원 엔지니어링세라믹팀) ;
  • 장병국 (물질.재료연구기구 선진고온재료유닛트) ;
  • 김성원 (한국세라믹기술원 이천분원 엔지니어링세라믹팀)
  • Received : 2015.10.26
  • Accepted : 2015.12.01
  • Published : 2015.12.28
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Abstract

Lanthanum zirconate, $La_2Zr_2O_7$, is one of the most promising candidates for next-generation thermal barrier coating (TBC) applications in high efficient gas turbines due to its low thermal conductivity and chemical stability at high temperature. In this study, bulk specimens and thermal barrier coatings are fabricated via a variety of sintering processes as well as suspension plasma spray in lanthanum zirconates with reduced rare-earth contents. The phase formation, microstructure, and thermo-physical properties of these oxide ceramics and coatings are examined. In particular, lanthanum zirconates with reduced rare-earth contents in a $La_2Zr_2O_7-4YSZ$ composite system exhibit a single phase of fluorite or pyrochlore after fabricated by suspension plasma spray or spark plasma sintering. The potential of lanthanum zirconate ceramics for TBC applications is also discussed.

Keywords

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  1. Phase Formation and Thermo-physical Properties of Lanthanum/Gadolinium Zirconate with Reduced Rare-earth Contents for Thermal Barrier Coatings vol.22, pp.6, 2015, https://doi.org/10.4150/KPMI.2015.22.6.420