Surfaces, Interfaces and Surface Analysis of MaterialsNo Access

A LIFE PREDICTION MODEL OF THERMAL BARRIER COATINGS

Department of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

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CHAO LIU

Department of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

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CHUNGEN ZHOU

Department of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

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https://doi.org/10.1142/S0217979210066252Cited by:4 (Source: Crossref)

Abstract

The durability and reliability of thermal barrier coatings(TBCs) have become a major concern of hot-section components due to lack of a reliable life prediction model. In this paper, it is found that the failure location of TBCs is at the TBC/TGO interface by a sequence of crack propagation and coalescence process. The critical crack length of failure samples is 8.8mm. The crack propagation rate is 3-10µm/cycle at the beginning and increases largely to 40µm/cycle near coating failure. A life prediction model based a simple fracture mechanics approach is proposed.

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