Cracking Behaviour of an Air-Plasma-Sprayed Thermal Barrier Coating

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Proceedings titleProceedings of the ASME Turbo Expo 2009
Conference2009 ASME Turbo Expo : Power for Land, Sea, and Air (GT2009), Orlando, Florida, USA, June 8-12, 2009
Pages249254; # of pages: 6
Subjectthermal barrier coating; thermal cycling; crack propagation
AbstractThe 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.
Publication date
PublisherAmerican Society of Mechanical Engineers
AffiliationNRC Industrial Materials Institute; NRC Institute for Aerospace Research; National Research Council Canada
Peer reviewedNo
NRC numberSMPL-2008-0130
NPARC number18423905
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Record identifier4f4aa173-91a8-4095-8b4f-2c0c6299a218
Record created2011-10-22
Record modified2016-05-09
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