MICROCRACKS CHARACTERIZATION FOR THERMAL BARRIER COATINGS AT HIGH TEMPERATURE

J. J. Hua, W. Wu, C. C. Lin, Y. Zeng (), H. Wang and X. B. Zheng
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J. J. Hua: The State Key Lab of High Performance Ceramics and Superfine Microstructure, Chinese Academy of Sciences, Shanghai 200050, P. R. China
W. Wu: The State Key Lab of High Performance Ceramics and Superfine Microstructure, Chinese Academy of Sciences, Shanghai 200050, P. R. China
C. C. Lin: The State Key Lab of High Performance Ceramics and Superfine Microstructure, Chinese Academy of Sciences, Shanghai 200050, P. R. China
Y. Zeng: The State Key Lab of High Performance Ceramics and Superfine Microstructure, Chinese Academy of Sciences, Shanghai 200050, P. R. China
H. Wang: Shanghai Institute of Measurement and Testing Technology, Shanghai, 201203, P. R. China
X. B. Zheng: Key Laboratory of Inorganic Coating Materials, Chinese Academy of Sciences, Shanghai 200050, P. R. China

Surface Review and Letters (SRL), 2013, vol. 20, issue 03n04, 1-10

Abstract: Thermal barrier coatings (TBCs), used in gas turbine blades, are exposed to oxidation and thermal fatigue conditions. The characterization of TBCs was often performed in laboratory experiments, therefore, its detail failure mechanism is not quite obvious. For better understanding of the phenomenon, it is recommended to observe it under the condition simulating the real service conditions of gas turbines. In the present work,ZrO2coatings were prepared by air plasma spraying (APS). Scanning electron microscope (SEM), equipped with a heating system, was used to study thein situmicrostructure change of TBCs at service temperature at which the aircraft is operated. The bond coat (BC) layer's thickening process and thermally grown oxide (TGO) generation along with the cracks growth are revealed. Moreover, the influence of the service temperature and holding time on the failure mechanism of TBCs is discussed. The crack healing produced during the coating re-melting reaction is observed, and it is the key factor to increase the thermal conductivity of the coating.

Keywords: Thermal barrier coatings; in situanalysis; TGO; microcracks; thermal conductivity; crack healing (search for similar items in EconPapers)
Date: 2013
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DOI: 10.1142/S0218625X13500352

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