Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Phase Formation and Thermal Diffusivity of Thermal Barrier Coatings of La2Zr2O7, (La0.5Gd0.5)2Zr2O7, Gd2Zr2O7 Fabricated by Suspension Plasma Spray

서스펜션 플라즈마 용사법으로 제조한 La2Zr2O7, (La0.5Gd0.5)2Zr2O7, Gd2Zr2O7 열차폐코팅의 상형성과 열전도 특성

  • Kim, Sun-Joo (Engineering Ceramics Center, Korea Institute of Ceramic Engineering and Technology) ;
  • Lee, Sung-Min (Engineering Ceramics Center, Korea Institute of Ceramic Engineering and Technology) ;
  • Oh, Yoon-Suk (Engineering Ceramics Center, Korea Institute of Ceramic Engineering and Technology) ;
  • Kim, Hyung-Tae (Engineering Ceramics Center, Korea Institute of Ceramic Engineering and Technology) ;
  • Jang, Byung-Koog (Research Center for Structural Materials, National Institute for Materials) ;
  • Kim, Seongwon (Engineering Ceramics Center, Korea Institute of Ceramic Engineering and Technology)
  • 김선주 (한국세라믹기술원 이천분원 엔지니어링세라믹센터) ;
  • 이성민 (한국세라믹기술원 이천분원 엔지니어링세라믹센터) ;
  • 오윤석 (한국세라믹기술원 이천분원 엔지니어링세라믹센터) ;
  • 김형태 (한국세라믹기술원 이천분원 엔지니어링세라믹센터) ;
  • 장병국 (물질재료연구기구 구조재료연구센터) ;
  • 김성원 (한국세라믹기술원 이천분원 엔지니어링세라믹센터)
  • Received : 2016.12.14
  • Accepted : 2016.12.28
  • Published : 2016.12.31
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Abstract

In order to comply with demand for high efficient gas turbines operating at higher temperatures, considerable amounts of research efforts have been performed with searching for the next-generation thermal barrier coatings (TBCs) with respect to coating materials as well as processing methods. In this study, thermal barrier coatings in the $(La_{1-x}Gd_x)_2Zr_2O_7$ system, which is one of the most versatile materials replacing yttria-stabilized zirconia (YSZ), are fabricated by suspension plasma spray with suspension made of synthesized powders via solidstate reaction. Dense, $100{\sim}400{\mu}m$ thick coatings of fluorite-phase zirconate with moderate amount of segmented microstructures are obtained by using suspension plasma spray. Phase formation and thermal diffusivity are characterized with coating compositions. The feasibility of $(La_{1-x}Gd_x)_2Zr_2O_7$ coatings for TBC applications is also discussed.

Keywords

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