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J. Korean Ceram. Soc. > Volume 50(6); 2013 > Article
Journal of the Korean Ceramic Society 2013;50(6): 353.
doi: https://doi.org/10.4191/kcers.2013.50.6.353
플라즈마 용사법으로 제작된 4mol% Y2O3-ZrO2 열차폐코팅의 화산재에 의한 고온열화거동
이원준, 장병국1, 임대순, 오윤석2, 김성원2, 김형태2, 김형태1, 김형태1, 김형태1
고려대학교 신소재공학과
1물질재료연구기구 고온재료유니트
2한국세라믹기술원 엔지니어링세라믹센터
Hot Corrosion Behavior of Plasma Sprayed 4 mol% Y2O3-ZrO2 Thermal Barrier Coatings with Volcanic Ash
Won-Jun Lee, Byung-Koog Jang1, Dae-Soon Lim, Yoon-Suk Oh2, Seong-Won Kim2, Hyung-Tae Kim2, Hiroshi Araki1, Hideyuki Murakami1, Seiji Kuroda1
Department of Materials Science and Engineering, Korea University
1High Temperature Materials Unit, National Institute for Materials Science
2Department of Engineering Ceramic Center, Korea Institute of Ceramic & Engineering Technology
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.
Key words: 4 mol% $Y_2O_3-ZrO_2$, Thermal barrier coatings, Plasma spray, Volcanic ash
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