Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Hot Corrosion Behavior of Plasma Sprayed 4 mol% Y2O3-ZrO2 Thermal Barrier Coatings with Volcanic Ash

플라즈마 용사법으로 제작된 4mol% Y2O3-ZrO2 열차폐코팅의 화산재에 의한 고온열화거동

  • Lee, Won-Jun (Department of Materials Science and Engineering, Korea University) ;
  • Jang, Byung-Koog (High Temperature Materials Unit, National Institute for Materials Science) ;
  • Lim, Dae-Soon (Department of Materials Science and Engineering, Korea University) ;
  • Oh, Yoon-Suk (Department of Engineering Ceramic Center, Korea Institute of Ceramic & Engineering Technology) ;
  • Kim, Seong-Won (Department of Engineering Ceramic Center, Korea Institute of Ceramic & Engineering Technology) ;
  • Kim, Hyung-Tae (Department of Engineering Ceramic Center, Korea Institute of Ceramic & Engineering Technology) ;
  • Araki, Hiroshi (High Temperature Materials Unit, National Institute for Materials Science) ;
  • Murakami, Hideyuki (High Temperature Materials Unit, National Institute for Materials Science) ;
  • Kuroda, Seiji (High Temperature Materials Unit, National Institute for Materials Science)
  • 이원준 (고려대학교 신소재공학과) ;
  • 장병국 (물질재료연구기구 고온재료유니트) ;
  • 임대순 (고려대학교 신소재공학과) ;
  • 오윤석 (한국세라믹기술원 엔지니어링세라믹센터) ;
  • 김성원 (한국세라믹기술원 엔지니어링세라믹센터) ;
  • 김형태 (한국세라믹기술원 엔지니어링세라믹센터) ;
  • ;
  • ;
  • Received : 2013.09.10
  • Accepted : 2013.10.09
  • Published : 2013.11.30
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Abstract

The hot corrosion behavior of plasma sprayed 4 mol% $Y_2O_3-ZrO_2$ (YSZ) thermal barrier coatings (TBCs) with volcanic ash is investigated. Volcanic ash that deposited on the TBCs in gas-turbine engines can attack the surface of TBCs itself as a form of corrosive melt. YSZ coating specimens with a thickness of 430-440 ${\mu}m$ are prepared using a plasma spray method. These specimens are subjected to hot corrosion environment at $1200^{\circ}C$ with five different duration time, from 10 mins to 100 h in the presence of corrosive melt from volcanic ash. The microstructure, composition, and phase analysis are performed using Field emission scanning electron microscopy, including Energy dispersive spectroscopy and X-ray diffraction. After the heat treatment, hematite ($Fe_2O_3-TiO_2$) and monoclinic YSZ phases are found in TBCs. Furthermore the interface area between the molten volcanic ash layers and YSZ coatings becomes porous with increases in the heat treatment time as the YSZ coatings dissolved into molten volcanic ash. The maximum thickness of this a porous reaction zone is 25 ${\mu}m$ after 100 h of heat treatment.

Keywords

References

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