Open AccessCracking Behaviour of an Air-Plasma-Sprayed Thermal Barrier Coating
Author(s) -
W.R. Chen,
Xijia Wu,
Basil R. Marple,
Xiao Huang,
Prakash Patnaik
Publication year - 2009
Publication title -
national research council canada (government of canada)
Language(s) - English
Resource type - Conference proceedings
DOI - 10.1115/gt2009-59135
Subject(s) - thermal barrier coating , materials science , ceramic , cracking , composite material , coating , oxide , layer (electronics) , degradation (telecommunications) , classification of discontinuities , superalloy , metallurgy , microstructure , electronic engineering , mathematical analysis , mathematics , engineering
The degradation of a thermal barrier coating (TBC) system is dominated by the formation and growth of a thermally grown oxide (TGO) layer between the ceramic topcoat and metallic bond coat, leading to a separation near the ceramic/bond coat interface during service. Crack propagation in a thermally sprayed TBC normally proceeds via the opening and growth of pre-existing discontinuities in the ceramic layer near the ceramic/bond coat interface region assisted by cracking associated with the evolution of the TGO. The combined effect of these degradation processes results in premature TBC failure. In the present study, TGO growth and cracking behaviours were investigated under cyclic oxidation conditions with different cycle frequencies. The results showed a likely relationship between the maximum crack length and TGO thickness, suggesting that the establishment of an empirical formula may be possible to serve as the basis for a TBC life prediction model.Peer reviewed: NoNRC publication: Ye
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