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학술저널
저자정보
Jung, Yongchan (Creative Future Technology Lab., KEPCO Research Institute, Korea Electric Power Corporation) Kim, Mintae (Creative Future Technology Lab., KEPCO Research Institute, Korea Electric Power Corporation) Lee, Juhyeung (Creative Future Technology Lab., KEPCO Research Institute, Korea Electric Power Corporation) Ahn, Jamin (Materials Engineering, Korea University of Technology and Education) Kim, Kihong (Materials Engineering, Korea University of Technology and Education)
저널정보
한국전력공사 KEPCO Journal on electric power and energy KEPCO Journal on electric power and energy 제2권 제2호
발행연도
2016.1
수록면
273 - 278 (6page)

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In order to evaluate the lifespan of high-temperature parts with thermal barrier coating in gas turbines used for power generation, this study was performed on an 80 MW-class gas turbine exceeding 24 k equivalent operating hours. Degradation characteristics were evaluated by analyzing the YSZ (Yttria Stabilized Zirconia) top coat, which serves as the thermal barrier coating layer, the NiCrAlY bond coat, and interface layers. Microstructural analysis of the top, middle, and bottom sections showed that Thermal Growth Oxide (TGO) growth, Cr precipitate growth within the bond coat layer, and formation of diffusion layer occur actively in high-temperature sections. These microstructural changes were consistent with damaged areas of the thermal barrier coating layer observed at the surface of the used blade. The distribution of Cr precipitates within the bond coat layer, in addition to the thickness of TGO, is regarded as a key indicator in the evaluation of degradation characteristics.

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