Simulation of the Effect of Sintering and Interface on the Failure Mechanism of Thermal Barrier Coatings

Abstract:

Thermal barrier coatings (TBC) are mainly composed of four layers: top coat (TC), thermal barrier oxidation (TGO), bond coat (BC) and substrate (SUB). The finite element model is used to investigate the failure mechanism of TBC. The influences of sintering of TC and the properties of TGO/BC interface on the stress S₂₂ were considered. The numerical results show that sintering of TC can change the tendency of the stress S₂₂ within TC from peak to valley along the TC/TGO interface; When considering the cohesive behavior of TGO/BC interface, the TGO/BC interface may begin to crack in the heating stage, then in the swelling stage the interface crack in the TGO/BC interface may close, and in the cooling stage the interface will crack again along the TGO/BC interface. When considering TGO/BC interface and sintering of TC simultaneously, sintering of TC has great influence on the stress S₂₂ of BC near the peak and valley of TGO/BC interface.

• Periodical: Materials Science Forum (Volume 817)
• Pages: 764-771
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.817.764
• Online since: April 2015
• Authors: Wei Chen, Jian Guo Zhu, Gui Lan Chai
• Keywords: Cohesive, Failure, Simulation, Sintering, Thermal Barrier Coatings

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