Abstract
Rolls-Royce has used ceramic thermal barrier coatings (TBCs) in jet engine combustors for well over a decade and on turbine nozzle guide vane platforms (RB211-535E4) and aerofoils (RB162) for several years. Much work has been done to characterize and improve TBC systems for use in more aggressive engine applications. The philosophy and some of the studies performed are reviewed in this paper to understand better the failure mechanisms which govern coating life in service. Findings are correlated with relatively simple laboratory rig test evaluations and with a rainbow service trial involving over ten thermal barrier systems. Some of these systems have been inspected after close to 10 000 flying hours (5000 cycles) and found to be in near-perfect condition.
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