Journal of Surface Science and Engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Fabrication and Characterization of La2Zr2O7/YSZ Double-Ceramic-Layer Thermal Barrier Coatings Fabricated by Suspension Plasma Spray

서스펜션 플라즈마 용사법을 이용한 La2Zr2O7/YSZ 2층세라믹 열차폐코팅의 제조와 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) ;
  • 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(NIMS) 선진고온재료유닛트) ;
  • 김성원 (한국세라믹기술원 이천분원 엔지니어링세라믹팀)
  • Received : 2015.12.08
  • Accepted : 2015.12.30
  • Published : 2015.12.31
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Abstract

Rare-earth zirconates, such as $La_2Zr_2O_7$ and $Gd_2Zr_2O_7$, have been investigated as one of the candidates for replacing conventional yttria-stabilized zirconia (YSZ) for thermal barrier coating (TBC) applications at higher turbine inlet temperatures. In this study, double-ceramic-layer (DCL) TBCs of YSZ 1st layer and $La_2Zr_2O_7$ top coat layer are fabricated by suspension plasma spray with serial liquid feeders. Microstructures, hardness profiles, and thermal durability of DCL-TBCs are also characterized. Fabricated DCL-TBCs of YSZ/$La_2Zr_2O_7$ exhibit excellent properties, such as adhesion strength (>25 MPa) and electrical thermal fatigue (~1429 cycles), which are comparable with TBCs fabricated by atmospheric plasma spray.

Keywords

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